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Heavy works

Everyday we have a lot of works to do in NR.
We need to take sample pieces every time, at the construction site. There are some types of sample figure. Round, square, plane and so on. One of them give us a pain that pick it up. We call it “A bending sample”.
Why is it? That’s because it’s too heavy to bring alone. The mold is square type and cast in iron. This size is bigger than other round type molds. One testing uses three pieces and it need to check at 7 days and 28 days. So we must take six pieces at least for strength testing.
I weighed it before putting mold and figured sample. It was fifty-five kilograms weight totally. 55 kg is about 120 pounds, you know. This weight is like one man. It was heavy work and real, too.
After take them off from the iron mold, those are put into pool. One week and four weeks later, we will bring them up again from water. A pressure machine needs to set up for bending system, too. Well, it is such a heavy work for us.
Takema Futami from NR

Our zero emission plant


We at NR have the same troubles and tasks of any other RMC plant.

We deliver concrete to the jobsites and we then have to deal with remaining and returned concrete and sludge.

But, as you know, we are transforming these waste into a new business opportunity.


On December 29 only, we sold about 30m3 of recycled aggregates.

As you can see in the above picture, our customers come to take our recycled aggregates with their own dump cars and trucks.

Three days before we delivered to a single jobsite in Izu Nagaoka (Panorama Park, you can find it in a previous article) about 160m3 of the same aggregates, so now our stock is almost empty.


We host almost every week some customers interested into our concrete recycling system.

In the above pictures people from Toyama's Nanto Concrete.

We started this system about 8 years ago and since then we are not disposing even 1m3 of returned concrete to the landfill.

100% zero emission plant.

To do this is necessary to find some good ways to sell the recycled material.

In order to do this is vital to build and have a strong and good communication with our customers.

So we do it by using social media (Line, Facebook, etc.), our NRTimes magazine, by phone and of course by man to man communication.

The granular recycled material can be used to mix a new concrete, as filling material for road sub base and to mix a cheap recycled porous pavement (like at the Panorama Park).

Another important point is to invite the interested people to come to our plant and see how the system works.

Our target is mainly the small medium concrete enterprise.

We really hope to be able to help more and more small medium concrete companies to become able to follow our example and become a zero emission concrete plant.

Another good day to be working with concrete!


Mitsuya Miyamoto (translated by Alberto Ferrari)


Alkaline water with calcium

Everyday we have a lot of works to do in NR.
We need to pick samples up when a customer want them. Then we bring them back to our factory. Those sample pieces are put in a pool that is keeping water temperature sensor at 20 degree. All season, it needs to keep this from hot summer to cold winter.
The pool has a water circulation system with pumping device. This system is working on whole days. It is a very tough work for the device. Because the pool was filled with alkaline water with nicro calcium elements.
Last day it suddenly stopped to work. We searched the cause around the system. Soon we find it in the pool. A water pump stained by white objects. It might be a calcium deposit. We cracked it with hammer but it did not work.
We changed the device to a new one. Thankfully we can get it on a web site, without effort. So we started new year operations with new circulation system. It is so good that worked out fine.
Takema Futami from NR labo.

Our new sustainable porous pavement: 1500m2 in 2 days!


In the last two day, December 26-27, we've done a big jobsite (about 1200m2=150m3) of our new and cheap sustainable porous concrete.

It is made by using our recycled IWA aggregates as 100% substitution of natural aggregates, plus more or less 50kg. of cement and water.

As we always say, a waste can be transformed into a resource.

This is what we do, by transforming concrete waste into reusable material, by using Mapei's Re-Con Zero EVO powder.

The jobsite was the parking lot of Izu Nagaoka's Panorama Park, a big amusement area where you can also catch a lift to go up to the Katsuragi Mountain.

Please see the pictures below and for the record, our customer was extremely satisfied, giving us a lot of free tickets to the lift too!


As it contains very few water, it can't be delivered by a normal truck mixer.


Then it is discharged and worked by using different types of machineries.








Then, for one year we will contantly check its condition and eventually repair some damaged spots.

We'll keep you updated!


Mitsuya Miyamoto & Alberto Ferrari

A salvaging

Everyday we have a lot of works to do in NR.
NR has many trucks from big one to small one. Many of our customers are not big constructor. Also they worked with a few members. Therefore they have a lot of small job sites like carport, house base, garden alley and so on. So our trucks have to enter like that narrow, long, rough roads.
Last day a driver delivered to a farm storage base. The way had a narrow gravel surface. It was a heavy weight before discharge fresh concrete. As expect soon the truck was caught in the mud area. Then we were called by the driver for emergency.
I drove a little big truck than the one for helping with some wires. So I need to pull him from a stable surface road. He were discharging to weight down when I got at the job site. Soon we tight the wires between each trucks.
A few minute later we could get off the mud area and completed this job site work. An empty truck is lightweight about 4 ton than full load one. I have known the fact but I didn’t understood. This thing taught me this idea. Every job site filled up good idea. In fact I need to know more.
Takema Futami from NR labo.

An aging construction

Everyday we have a lot of works to do in NR.
I got a heavy package than an imaging weight. A colleague said to me.
“I received your delivered box. It’s so heavy. What is this?”
Some time those things must have been done. It must be taken a sampled core. I can guess it without seeing.
So NR have a diagnosis section for aging concrete structure. This time I got a message from a building manager in Tokyo. He is concerning about the building, because it was built over 50 years ago.
He asked me by E-mail “How long time this building will be able to be used?” Then he have some concrete cores which were picked for laying pipes. I replied him that “I could use it for easy building check.”
Therefore he sent me the heavy package. I opened it and done neutralization test. As expected, this core get some neutralizing. Now I am making the report. A present status, guess situation and counter plan.
A core can help me to get some ideas. So the core could tell me his history for aging 50 years. That is very interesting.
Takema Futami from NR labo.

In Winter season

Everyday we have a lot of works to do out of NR.
Japanese winter has a lot of sides from south to north. This week I went to Nagano again. Actually last month I have been in it, but this was south side of Nagano prefecture.
When I drove by car, this was a shiny day. Then I got north and north, there were starting to lose colors. Finally there’s only one color, my sight filled up white. Heavy snowing, there were.
I visited RMC company. Soon I've been told that this is not unusual on the season. We used to make concrete and delivering in those days. When we can’t do it, we have to out the snow from our roads.
He said to me more. RMC companies usually have a heavy machine with big bucket. So we help local road maintenance with thick snow.If our customers stop their works, we have another work as road guardian. 
I thought they were not able to do jobs when they got snow. Now I got a teamwork idea in winter. So there were busy guys in RMC company.
Takema Futami from NR labo.

Sustainability is not just an empty word


A big change that will be required for RMC factories is to become a sustainable industry.

Our world, our environment is asking for it.

And we must give an answer, by solid facts, not just empty words.


We have many examples of pavements here in Nagaoka, where we used our recycled granular material instead of asphalt.

It is 100% recycled and also water permeable.


In the picture below you can see a road that was made by using this material in the deep forest around here. Our customer needed it to go up and down with his small truck, as he owns a mushroom cultivation over there. Of course he doesn't want the road to be slippery and we were very glad to know that he didn't face any kind of problem.


At the end of this year, 27 and 28 of December, we will deliver about 150m3 of it for a big parking lot here in Nagaoka's Panorama Park.

The material must be delivered by dump trucks as it won't be easily discharged by RMC trucks.

The mix design is simple:

100% recycled IWA aggregates (about 1600 kilos)

50 kg of cement

50 kg of water.

As cement we use eco cement, but we think that it could be used also fly ashes or slags too.

By doing this we try to reduce the use of Portland Cement, by replacying it with SCMs (Supplemementary Cementitious Materials).

Of course, this type of products can not be used when high strenghts or JIS are needed, but in cases like the above ones can be used without any problem.

The most important thing, by the way, is to give the customer what he wants.

Plus, it is cheap and sustainable.

Sustainability must not be just an empty word.

We have to fill it with something.

Which in our case is concrete.

And we will do all we can to spread these solutions all over the Country.

We hope that many of our business partners will join us on December 27 and 28.

150m3 means about 1200m2 of sustainable parking lot.

Another good day with RMC!


Mitsuya Miyamoto (translated by Alberto Ferrari)

JIGSAW, the concrete recycling specialized branch


The RMC factories are specialized in the production and delivery of fresh concrete, but not in its recycling and reuse.

So one of our GNN partners, Kyoto based Takaragaike RMC, decided to set up a place in their plant for a subsidiary company specialized in the recycling of returned-remaining concrete, named JIGSAW.


They have set up 2 water tank pits to discharge and treat returned concrete, waste water and sludge.


Then the concrete waste are blended and treated everyday by using the IWA-Re'Con Zero EVO powder, as we do here at NR.


The cost is calculated in 500 yen per ton and for the process is needed one person for about 30 minutes a day.

Let's say that until now to treat and dispose 1m3 of returned concrete had a cost of 100.

JIGSAW can assure a cost not higher than 80.

So Takaragaike can save 20 without doing anything, just let JIGSAW have a space to treat and work on returned concrete.

Then JIGSAW can sell the obtained recycled aggregates on its own, making a profit.

So Takaragaike doesn't have to worry about its returned concrete and keep doing what they can do best, produce and deliver fresh concrete. Plus they save money on concrete waste disposal.

It's a win-win situation.

This business model was an idea of 27 y.o. Mr. Etoo of Takaragaike RMC.

It's really great when young people have such great ideas and we will do our best to support him and them in this new very promising project!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Similar tests

Everyday we have a lot of works to do out of NR.
I went to an RMC company which have another task other than concrete. It is located at north of Okayama prefecture. I have been interested in their works since hearing the story. 
Of course they are making fresh concrete. And more, they used to take some tests about soil property. To tell the truth, those tests have similar side with materials for concrete. Density, Particle size, compression strength and so on.
So we can use same items for testing. I talked with the top of factory about this challenge. He said that “I tried this works about 10 years ago. Then there were a few customers. Sometime they gave us a few tests. So it was not everytime.”
Few years later, they started to give us every tests. That’s because we could take a little lower cost and quick response than large research institute. This work grows up to one of benefit contents on our all works.  I feel that’s great!
At last he said to me. “When you want to learn more, ask us every time.”
Thank you for all kindness. I want to meet him again.
Takema Futami from NR labo.

We have a cheaper "18-18-20 N" mix design!


Probably there is no construction company that never ordered a concrete with this mix design, 18 (strength) - 18 (slump) - 20 (aggregates size) N (cement type, normal).

In case of civil engineering the cement type usually is BB (for faster hardening).

This mix design is used for non structural elements and it is the most common order we receive.

Some examples of applications are rubble concrete or levelling concrete for slabs.

In this case we always tell our customer that we have a cheaper concrete with the same qualities, but made by using recycled aggregates and with no JIS mark.




And yes, it looks just like a "normal" concrete!

Our custmers use to say "if it hardens it's fine!".

So in the past years we increased our sales of these products coming from recycled returned concretes, which was then transformed into recycled aggregates, by using the Re-Con Zero EVO powder.

And we have found many positive minded RMC plants across Japan, that followed our example and started their own concrete recycling projects.

In this way we can reduce and eliminate our concrete related waste (sludge, remaining and returned concrete).


If we throw these waste away they are just a waste.

But if we re-use them they become a resource for us.

And we also help to create a better environment for us and our children.

"You need a 18-18-20 N concrete?

We have it and it is cheap too!"

Let's create a better future by improving our RMC industry!


Mitsuya Miyamoto (translated by Alberto Ferrari)


Amazing works

Everyday we have a lot of works to do out of NR.
I saw an amazing works at Takaragaike RMC factory in Kyoto. An ordinary blocked wall changed to woody texture in my sight. I have seen it when it was already completed. On the web site, there's another job site and in my factory too.
It was a first time to watch making it up from the beginning. Then one woman who came from Fukuoka had appeared in the morning. Soon she started to paint wood lines right to left and up to down in easy.
I talked her that “It is so real, isn’t it?”
“How do you learn this skill?”
“Did you make those tools by yourself?”
She said with whisper words.
“I’m not good enough.”
“I don’t able to make natural figure.”
“I need to do more practice.”
Her works were so quickly. Before lunch time, she disappeared from the factory. That was very artistic work I watched. And she was a mysterious woman I met. After, the wall was staring by all around people like street arts.
Takema Futami from NR labo.

Random sampling

Everyday we have a lot works to do in NR.
I went to a job site for taking fresh concrete sample pieces. This customer was a little rare case. Usually we used to take a sample one time at first. This time, they want some samples with several patterns.
 7days strength, 
 28 days strength,
 and 91 days strength. 
Then those are left sinking in a pool which's degree keeps one or natural outside one. And more they want it taking with random sampling that 3 times during all of discharge concretes. So I have to wait at the job site until we can get all the samples.
While waiting I could watch our concrete putting into frames. Pumping, vibration, surface shaping and so on. So I was not bored during that time.
The job site works take me some hints for our products. Everytime job site filled it up realizations. The pump operator said to me “See you again at next job site!” This experience gives me a good feeling, too.
Takema Futami from NR labo.

Cold region in winter period

Everyday we have a lot works to do out of NR.
I went to Iida city on Shinsyu. I didn’t know that there were many differences between Shinsyu and Nagano. Although both of two are included in the Nagano prefecture.
I invited an RMC company which in Shinsyu as coach for permeable concrete putting. So they organized an event to show how to work the permeable concrete. That day was hard rain, but there were over 40 people who wanted to know it.
Those visitors asked me a lot about working detail of it.
 “How much is it?”
 “Where will I buy it?” 
“When does it apply to give us?”
All of them have real job sites where they are able to apply this permeable concrete. Shinsyu area used to be very cold in winter. They can not work to put concrete as well in the period, but this permeable one is able to put it on. It seemed to get good feeling for cold region workers about this speciality. I hope they could work well about this concrete putting it during winter, too.
Takema Futami from NR labo.

Colored concrete

Everyday we have a lot of works to do in NR.
A concrete color of figures was used to feel a monochromes like White or Grey. Sometimes customer want to get colored concrete. Then it could take two ways.
To paint the color after shaping. Another, to mix color powder between fresh shapes concrete. RMC factory doesn’t like the later. Because the plant system were colored by them after all.
Last day our customer want to use the color powder. So they throw it to truck-mixer just before pumping. I ask pump operator that “ Do you like this thing?”
He replied “No, no. It will stain pumping process at least next time.” And more “I want to keep it away as possible.”
So the coloring concrete was hated between workers. Actually it seems to need thinking about after care of colored concrete for us.
Takema Futami from NR labo

Marine construction

Everyday we have a lot of works to do in NR.
Our company is surrounded by great natures. It is near by some mountains, deep sea, large fields and so on. So we often give our products to marine constructions.
Last day, we make it for a
customer who is a marine constructor. The concrete has a few differents types other than the ordinary type. It is a special blend for coast. Not ordinary cement, lower water, large aggregate etc.
So the shape is not as always seen concrete. It has a hard praticiticy, heavy and not useful. The customer handles it easy by heavy machine like excavator.
They made coast guard products. There are a lot of kind of concrete. The shapes of wide, tall and unitable. Then we must give them suitable property concrete. This job need to know about each customer wants. It is difficult thing and it’s an interesting, too.
Futami Takema from NR labo.

Close relation talking

Everyday we have a lot of works to do out of NR.
This week I met a lot of RMC people. President, chairman, employee etc. I visited 3 RMC companies in the western area.
Sometimes I could meet one who's their related. Mother, grandpa, cousin and so on. This time I met a man with his wife. Then we got to exchange greetings each other.
She said me that “My husband changed since he came back from NR in Shizuoka.”
“Now he often talk to me about his job.”
“He looks like fun with the job.”
The man replied us.
“NR staffs have very quick response. That’s great.”
“An action is first. I want to be like them.”
This is a big pleasure for us. A man was changed by NR activities. It is easy only to say that “I changed.”
It is not to easy be talked that “He began to change.” from close relation.
So we could change again by seeing them changing. This cycle is amazing, isn’t it?
Takema Futami from NR labo.

The Yokoyama Sangyo challenge part 1


Also in Saitama Prefecture, where Yokoyama Sangyo runs 5 RMC plants, there is a trouble concerning returned and remaining concrete and sludge.

They heard about our recycling IWA System at a meeting that was held at Saitama's Sanwa Kengyo plant.

So then a group of them came to visit us in Nagaoka.


As said above, they run 5 plants in Saitama Prefecture and today staff members of 3 different plants came to visit us.


Here we're explaining them about how our slit water tank system works. They were surprised about how clean was the water coming out of the fence.


Then as usual we showed a demonstration about how we transform concrete waste into a recycled and reusable material.


Saitama is close to the Tokyo Metropolitan Area, where there are even more strict rules about concrete waste.

Limit to the usage of water, strict rules about sludge waters and recycled aggregates, impossibility to use eco cement, narrow spaces to stock aggregates, few places to dispose sludge cakes, very busy plants. These are some of their main problems.


We also showed them a demonstration by using the RMC truck to transform remaining concrete into granular material.


Then they will have to search the best way our IWA System will fit their needs and their area.

But it is a good start as they finally decided to solve their problem related to concrete waste.

Of course we will do our best to support them!

Another good day for RMC!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Original designed shirt

Everyday we have a lot of works to do in NR.
NR made some original shirts. There are T-shirt, polo shirt and in a few different colors. Our staff put it on everyday, everywhere, everytime. Surprisingly those are well received by others.
“It’s fun. Is it order made?”
“Nice. Where do I can get one?”
“I want to have it !”
So we decided to send it to the ones who want to get them. Soon they replied us thanks with some pictures. It is an interesting thing. All area of Japan, RMC persons are wearing same designed shirt. Ibaraki, Fukui, Shikoku and so on.
When I put it on my private time like with friends family. They ask me about it. This is good opportunity to tell about my job. If you want to have the original shirt, please call us. Then we can give it to you.

Huge papers

Everyday we have a lot of works to do in NR.
Japanese Industrial Standards. Our plant is approved by JIS. So we need to keep sticked to the process when making ready mixed concrete on JIS. The process has many details.
Daily reports, receive receipts, manufactured records etc. JIS requires us to keep them for five years. We need to keep some of them forever. So we have to have some storages for huge papers in the office.
Every year those are threw away for renewal exchange. There are a lot of garbage bags! Fortunately JIS does not need papers. So we are trying to change paper to electronic devices. When it will be completed, the office will have free storage for other things.
That is great. Clean office makes creative mind. We should be creative for good ideas. I hope that we'll be able to see the empty storage some day.
Takema Futami from NR labo.

Pavements made of returned concrete??


In one of the previous blogs I've already introduced a new type of roads made by using a recycled material obtained from returned/remaining concrete.

It has more or less the same price of asphalt, but it doesn't need any special equipment nor knowledge for its placement, so it is very convenient compared to the normal asphalt.


This material is brought to the jobsite by any kind of dump truck as it cannot be delivered by using a normal RMC truck (as it is very stiff).

As already said, it is made by recycled returned concrete (and sludge) at 100%.

We only add some cement (about 50 kilos) and water.


Our latest jobsite was in the city of Numazu, near our plant.

The place is the Numazu Imperial Villa (Goyotei), which is a former imperial summer residence.


As you can see from the pictures, the pavement looks like a cementitious material, containing recycled aggregates which maximum size is 40mm.


It has also some good resistance and water permeable properties, so it avoids water to accumulate on the surface.

This time our customer used about 20~25 m3.

It is a product that can be produced and delivered only by RMC plants.

For this reason we hope that is could spread through the RMC factories all around Japan!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Welcome board

Everyday we have a lot of works to do in NR.
We often have visitors from other areas of Japan. Last week the visitors came from Saitama, Kanagawa and Gifu Prefecture. They took not a few miles and times for coming.
So we started to display our pleasure on a welcome board. 
Then who would make it?
When this idea shown us from our president, one woman smiled. Soon she became the person in charge of this idea. Of course she had never made such a board. But she replied “Well, I’ll try it!”
She started to make the board while searching web site. That’s very good! Everyone got surprised by the great shape.
When the visitors saw this board, they got a good feeling. Some of them took a photo with it. From now we will meet you with the welcome board. So please come to our office. And thanks to her talent.
Takema Futami from NR labo.

Bus trip

Everyday we have a lot of works to do in NR.
Once a year, NR staff use to go a short trip by bus. Last weekend I went to Yamanashi prefecture with over forty members. Yamanashi has many sight seeing spots. Beautiful lakes, delicious meals, great mountain and so on. Two buses brought us to Katsuyama. 
This time we did grape picking at a very big farm. One of the good points of this trip is that participants can be with their family. So I could meet some colleague families. All of them had a different side without being in the office.
The matured grapes were really sweet. Soon after, the garden BBQ was nice. At last we went to a winery. Yamanashi has a lot of grape farms. So the wineries could get selected materials easily. Then we were able to taste those wine or grape juice. Somebody bought it as souvenir.
We are lucky. Before few days were rainy. Only this day was shine. We could spend the great day. Thanks to the company. Thanks to the planner. Thank you for everything.
Takema Futami from NR labo.

What is this black object??


In one of the previous post I wrote about the visit we made together with Giorgio Ferrari at Hikari Concrete plant in Okayama City.

Now they installed a black screen mesh to sieve the recycled aggregates made by using Re-Con Zero EVO.



On the back you can see the Shinkansen bullet train tracks, as the plant is very close to Okayama Station.


It is a very big screen equipment.

It looks like a monolith.

It is necessary to sieve the IWA aggregates made by using the Re-Con Zero EVO powder mixed with returned/remaining concrete and sludge.

The sieve is in a range of 20mm~0mm.


And this is what it will be obtained.

There are many different cases.

Some customers use the recycled material as it is, some sieve it and some use a crusher to break the big blocks into a finer granular material.

The IWA System has many different variations, depending on customer needs and equipment.

The recycled material, as you know, can be used as road subbase or mixed to produce a new concrete.

The next time you will go to Okayama please take a look on the left and probably you will see that black object.

We are transforming sludge and returned concrete into a resource for the RMC companies.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Huge papers

Everyday we have a lot of works to do in NR.
Every September, NR must take an inspection about JIS. The surveillance officer comes from concrete cooperative society.
We need to prepare the inspection for one year. So we should keep a lot of papers, records and activities. The inspection took almost whole day. It's so long. They watched our plant, aggregate yards, testing room and so on. NR staff have prepared for the day about two weeks ago.
To tell the result, it's OK!
The officer said "No problem." "It's clean." "Please keep the shape."
Our mind settled down that the inspection finished in safely. Then I think that those papers volume is too much. We need some places for those keeping. 
Now we are tring to exchange the papers to electrization. When it's completed, the inspection will finish on half day. That would be great for us and them, each other.
Takema Futami from NR labo.

Building maintenance

Everyday we have a lot of works to do in NR.
We got some diagnosis requests from various areas. Kyushu, Kansai, Kanto and of course  our local area. Last day we have done a research about wall coring in an old building.
It was built over 40 years ago. The stairs got aging. The some doors were out of shape. It surprised me that there were some birds in a vacant room. This time the owner decided big repairing about concrete stair parts.
We took some cores from wall. Then it needs to do strength test, neutralization test and visual observations. The core hole was  fixed it up as soon as picked it up.
The residents were interested in the research. They asked us what did we done and why. Then we explained them. They looks like pleasure.
Takema Futami from NR labo.

Around Kyushu

Everyday we have a lot of works to do out of NR.
This week, I have been in Kyushu area. At first I came to Oita prefecture. I have done my job that explained IWA and DRT.
Next, I moved to Fukuoka prefecture. I’ve got a seminar about ISO management. The whole PDCA cycle is not easy, I felt.
Soon I took a train Shinkansen bound for Kumamoto prefecture. I visited the RMC company that applied IWA system a few month before. There are some problems. I've heard those and gave them some experiences from us. I got the feeling that they could drive this system by themselves. This is my pleasure.
Everytime the job trip gives me power for the next plan. Although my body is feeling heavy and tired. Around Kyushu moving needs a long time and long distance.
Takema Futami from NR labo.

Honshu's southernmost sludge mountain


Where is the most southern RMC plant in Honshu?

Its name is Across Concrete.

Their President came to visit us last week and had a three hours "intensive course" about our concrete recycling system.

They need to eliminate their concrete waste mountain from their plant.

He came the night before in Izu no Kuni City and the next morning at 8 am he was at NR.

By using our system we can completely recycle our returned concrete and sludge waste within less than 2 days.


In the above picture, our stock of IWA recycled aggregates.

Before using them to produce a new concrete we put them through a 40mm sieving mesh on the grand hopper.


Then we have to face JIS A 5308.

I think that every concrete plant manager is struggling to deal with JIS rules.

JIS fixes the process rules for a concrete plant.

It is not possible to sell recycled aggregates coming from returned concrete by applying the JIS mark.

Even if those aggregates fulfill the standards.

In the beginning, when it was introduced, JIS was making our life easier, but now it became an obstacle for us.

Everyday we try to go through these obstacles, with the help and support of our business partners.

Let's clean up the most southern RMC plant too!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Questions from serious man

Everyday we have a lot of works to do out of NR.
There are a lot of people at Tochinan Kenzai in Saitama prefecture. They came from waste treating site, reusing company and another RMC factories. All of them interested in how to dispose return concrete. So we took a meeting about it.
I introduced them our NR systems:
 Re-Con Zero Evo
 Auto cleaning machine for mixer truck
When I showed them the results from the systems, they got surprised. Soon a few men asked me about details of our methods. Serious men have real problems. In a short while, they threw in a few questions into my speaking.
The meeting was over 3 hours. We exchanged our opinions each other. I got some real problem from another job area near by metropolitan. Everytime the meeting gave me a new feeling. It’s a good experience for me. Thanks a lot.
Takema Futami from NR labo.

Great nature

Everyday we have a lot of works to do out of NR.
I went to Shirakawa-cho in Gifu prefecture. There is a great nature. I saw a big valley, deep forest, waterfall and so on. Then I visited a RMC company. They welcomed me with smile. Soon they informed me about the history of the company. Big dam, tunnels and pavements.
Country side job get fewer year by year. The guy who worked as engineer said to me that stopping is easy way for us, but we must not stop for our customers. I was glad to meet such a guy in the country side.
At return path, I found some constructions among great natures.
No concrete, no human. No nature, no human.
I feel that our construct will not be lost now and forever.
Takema Futami from NR labo.

What will be the next task for Aduma Concrete?


GNN member Aduma Concrete is based in the norther part of Toyama and is one of the SluMor users.

They have a lot of experience in concrete waste treatment and have already a market for recycled materials.


Like us they deal with many local small enterprises.

Their management is very positive and open to new technologies, like SluMor and our water permeable concrete DRYTECH.

If they think that something could be interesting they immediately start a new project.

In the GNN group there are many plants like this.

They are challengers, heavy workers.

The next step for them is our concrete recycling system.

For this reason they came to visit us last week.

They are dealing with too many concrete waste in their plant and they need a solution for it.



They were very glad to be able to come and visit us.

We showed them how we treat returned concrete and concrete sludge.


The above picture shows the obtained granular material the day after. It is moved and blend together to the old IWA aggregates.

Like SluMor, this technology needs a market to sell the recycled material.

They already have a big market for non-JIS products, just like us, so it won't be a big problem to sell the recycled aggregates they will obtain by using Re-Con Zero EVO powder.


This is the flow in which we explain to our new partners how the IWA/RCZ EVO System works.

1 ton of concrete sludge costs to them about 30,000 yen for disposal.

By using our system it will become a resource.

We hope that Aduma Concrete will become Toyama Prefecture's leader in concrete recycling and eliminate their concrete waste mountain from their plant.


Mitsuya Miyamoto (translated by Alberto Ferrari)

The squeezed residue of sludge without water


A few weeks ago (as you probably have seen in our latest article) we had the inventor of the Re-Con Zero EVO powder, Giorgio Ferrari, here in Japan.

We went to visit Hikari Concrete plant in Okayama City and then moved to Kyoto, where we had a meeting at Shin Kyoto RMC.


The returned/remaining concrete's sludge are left into this pit for one day, in order to remove the water in it. The water goes out through the fence, leaving the sludge inside.


This is how it looks the day after.

Then, this sludge material is mixed with the returned concrete and the Re-Con Zero EVO powder in another close by pit.


The process can be done by using an excavator or a wheel loader.



In these years, since we started this concrete waste recycling project, we faced many troubles and became more and more expert in this field.

A trouble we faced here in Kyoto was due to the extremely high temperature, that made the sludge too hard too fast. It was kind of hard to move it away with the wheel loader.

So we tried to mix the sludge on the same day, with returned concrete.

We had a good result, but it took more RCZ EVO powder to obtain it, as we had more water inside the sludge.

By the way, our goal is to suceed in eliminating the filter press equipment from the Japanese RMC plants. Shin Kyoto RMC will by our test field to do this.

This can be done with our concrete recycling system.

It will take time and we will face other problems, but we will not give up.


Mitsuya Miyamoto (translated by Alberto Ferrari)


Visit to Hikari Concrete: their sludge mountain has already been reduced


It took about three years, but finally also Hikari Concrete, an Okayama based RMC company (subsidiary of Mitsuda Kenzai) has been able to succeed and start using the IWA System.

It is one of the biggest RMC company in Okayama and we visited them a few days ago together with Giorgio Ferrari from Mapei.

By using the IWA System they have been able to treat their concrete waste (returned concrete and sludge), reducing their sludge mountain's volume.



This is where they discharge and treat their concrete waste, by using a wheel loader.


In the above pictures there are some IWA aggregates made by using the truck mixer (as a trial).

It took a long time and many trials but finally also Hikari Concrete started to reduce their concrete waste by our IWA Systema and hopefully they will be able to eliminate them completely from their plant very soon.

Their motto is "learn by doing mistakes".

Okayama and Kyoto are now moving by the same pace.

The next day we went to visit Shin-Kyoto RMC in Kyoto (see the next article).

Compared to us, in both plants they have a higher amount of cement in their normal concrete mix and so their concrete waste become hard fastly.

For this reason it must be treated earlier than we normally do.

But that's not a big problem for such positive minded companies like them.

We learn something new every day and we share it with our GNN associates.

The path to eliminate concrete waste from Japan is still long but we're moving forward everyday, step by step.


Mitsuya Miyamoto (translated by Alberto Ferrari)

International Organization for Standardization

Everyday we have a lot of works to do in NR.
NR has acquired ISO 14001, the Environment Management System, 2 years back. The system needs to be renewed every 3 years. So this year, we have to prepare next renewal.
This day, a surveillance man comes from ISO certifying our institute. He checked our documents, plans and reported very carefully.
ISO is International Organaization for Standardization. The basic manual was written in English. Then the information for Japan are translated from English. Unfortunately this translation is so bad. We couldn’t understand it easily.
The surveillance man taught us to get the meaning of ISO essence. Soon we could understand the ISO information summary from him.
International standards have many unrecognized problem like this. A wrong translation among different languages, cultures, thinkings and so on. So it might be able to understand reading original information in English. Someday I will try it at the next chance.
Takema Futami from NR labo.

Once in four years

Everyday we have a lot of works to do out of NR.

There were 500 people in a big hall. I was in Nagata-chou, central of Tokyo. They have many different types of people.

Young men, senior guys. Uniform men, casual guy. A few female and many male.
They have only one common repertory. What's it? That's a concrete permition.
This day, all of them need to renew it. It have every four years. I have often come and take a lesson from the institute. Everytime I could meet some ex-colleagues. We used to excahange self information each other.A new job site, latest business trip, common friends news and so on. 
The whole day lesson is hard work for us. Surprisingly the institute prepared to test us at last lesson since this time. It was a little difficult wituout preparation. After all, they got off from hall in quick motion. I don't know all of them have completed the test for renewal the permition.
But anyway, some men returned to a jobsite. Some guys went to a bar. Some person may meet again another works. 
See you again at next four years.
Takema Futami from NR labo.

Opposite type workability

Everyday we have a lot of works to do in NR.
NR has served a special concrete called slipform construction for the first time. The concrete has some unique propositions.
It has no fixed forms.
It uses an original great machine.
It needs no inquidity concrete.
As usual, we make the opposite type concrete.
The job site is into a tunnel. The machine is very big. There is no wide space. Our truck agitators can not go in the tunnel before signal. They need to wait under strong sunsine until the sign.
It has been a very hard work to control the workable conditions. Then we took a slump test at each place in NR and the job site. We got the situation of served concrete. Soon our batching operator made a next program by latest reports.
A new job take us unknown informations. So the experience make us to upper level supplier. The mission have completed safely.

The elimination of the sludge waste has a global significate


In our previous posts we've already introduced in detail our concrete waste recycling system.

The definition of scrap and build can adapt perfectly to the RMC Industry. Big production and also big generation of waste.

In Japan, but also in America and Europe the mass consumption is something that we have enjoyed in the past years.

Also Sweden.

In this Country they have been able to create an eco sustainable society.

The organic domestic waste are recycled at 99% and are re-used to produce the 50% of clean energies.

For example, buses run by using a mix between electricity and gas coming from organic waste.

The GDP of each person is more than the Japanese one and the economic development is still going on.


As RMC is one of the most used materials it is also one of the major causes of waste production.

This is why we should lead the change to an eco society everywhere in the world.

This year we've been to the INTERMAT exhibition in Paris.

Many new technics and equipment for concrete sludge handling were there.

But to me they all looked like old type ones.

New types of filter press machines, etc...

We should bring something innovative, something new, instead of new versions of the same old methods.

We need a paradigm shift.

Concrete sludge is related to returned/remaining concrete.

Sludge and returned concrete for us are not a problem anymore, but a resource to obtain an new reusable material, which creates new incomes.

100% recycle, by using a Mapei product called Re-Con Zero EVO.

This matter is global, not only referred to Japan.

No more filter press.

We look forward to spread our solution anywhere possible and to help the global warming reduction at the same time.


Mitsuya Miyamoto (translated by Alberto Ferrari)

A new product with a big potential


In one of our previous articles we've already introduced you our new product made by IWA aggregates plus a few water and cement.

We sell it at 5000 yen per m3, more than a half discount compared to normal concrete or even ECON.

Of course all the costs can be slightly different from area to area.

It has also a better durability compared to asphalt.

In the above picture we can see it in a dump truck, as it cannot be delivered by a RMC truck as it won't be easy to dicharge.


This is the condition after the discharging from the truck.


Then it is compacted by using the same equipment that are used in case of asphalt.


This is the finished work, after the placement of about 50m2.


As you know the IWA aggregates are obtained by our returned concrete/sludge recycling system (with Mapei's Re-Con Zero EVO).

2 ton of IWA aggregates + 50kg of cement + 50kg of water and it is done!

The cost for these material is about 1000 yen/m3, so we can benefit also with a big income.

It is a new way to sell the recycled material, hoping to help our GNN affiliates and RCZ users all over Japan.

Another good thing coming from returned/remaining concrete.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Unique aggregate

Everyday we have a lot of works to do in NR.
NR have another hopper to mix. So it can be used for other aggregate types, for unique concrete.
Last day, we caught a special request from a planner. They want to apply unique aggregate for the pavement. Usually nobody wants to make different type concrete.
Because it needs a practice, costs, another action etc. It is a natural reaction for them. But our company is not same as other RMC factories.
Then NR got the offer. Soon unique aggregates were deliveried on bags. An excavator picked it up to the hopper. A man tore it off. Later, we made the unique concrete.
So we can serve another type concrete. If you have a unique plan, please ask us about it.
Takema Futami from NR labo.

Let's squeeze the sludge!


Our staff member Endo drawed the above paper to show our customers how the slit water tank looks from the front.

It is very important that during the night the sludge get squeezed to remove all the water inside. The water is then reused to mix concrete.



The above video and pictures show how the process is done and how the slit and the chain look like.



Every customer that come to visit us gets really surprised that this kind of simple system works so well, allowing us to recycle the 100% of our waste.

It is not necessary to say that we don't have and don't need a filter press.


This is how the sludge looks the day after, in the early morning.

Time is money and so we had to find not only the best and most effective solution, but also the fastest one.

So at the end of the day, no concrete waste, no extra work in holidays.

Concrete waste don't represent a risk for us, but a new chance!


Mitsuya Miyamoto (translated by Alberto Ferrari)

It has started to spread faster!


Last month Mr. Mitsuda from Hikari Concrete (Okayama) came to visit us, to see in detail our IWA System for concrete and sludge recycling.

The RMC job is not an easy job.

It is a close and small world.

Everybody is very proud and jelaous of his work and his product.

So nobody want to share knowledge nor skills.

This is one of the reasons why GNN has been created, to collect information and to collect the most positive minded people in the business, all around Japan.

Also, everybody is struggling about concrete waste. The operations to break and dispose it are done in the holidays.

It looks stupid to waste holidays and Sundays to treat... waste!

But everybody is used to it and so don't even think that maybe any change could be possible.


Waste water and sludge water are disposed in this slit water tank.


Once the waters went out during the night the slit is opened and the hardened sludge is moved into the nearby pit by using an excavator.


Then the sludge (generated within 24 hours) are mixed with the returned concrete and treated with the Re-Con Zero powder.


Mr. Mitsuda is the son of the president, 4th generation.

It is a company with a long history and so not very easy to change and adapt to new methods.

But he's young, only 22 y.o. and so full of positive energy.

He've choosen to solve his company's concrete waste related trouble.

In the Okayama area we already had a good and positive example, represented by Mr. Takenami and his Shiraishi Kensetsu.

With this kind of young and positive minded managers we can solve this problem all over the Country!

The RMC future is becoming more and more bright!


Mitsuya Miyamoto (translated by Alberto Ferrari)

New product

Everyday we have a lot of works to do in NR.
Now we launched a new product called Masado from IWA aggregates. This is a semi permeable pavement. 
We used to be changing a return concrete to another material by Re-Con Zero which is IWA powder. Then the made material should be worked right now because it need big storage in limited back yard. So it was used for some products. Recycle concrete, roadbed and the pavement.
This time, a pavement company put it on for car parking area. The customer wants a putting material with no grasses, no pool, not expensive and so on.
I watched those works. Discharge, extend and rolling compaction. Those works were very fast. That's great! They are a professional of pavement. 
We want to increase the Masado pavement all over our area. That's because a return concrete can be another materials as products. This is great, too.
Futami Takema from NR labo.

What is our purpose? Just to produce a good product?


Even if we do our best to recycle our waste and tranform them into new products, if we don't have a good and continuous way to sell them we can't "close the circle".

So we have to think about many ways to sell our recycled aggregates.


This time we started a new line of product. It is called Masado and we can't deliver it by truck mixer, as it is too stiff. So our customer come to our plant to load it on their dump truck.

It is made by IWA recycled aggregates, a few cement and a few water and it is mostly used in carparks and small mountain roads.


This is the same road after about one month from the placement. Even if it was a rainy the road stays perfectly clean from water puddles.

As it is made mostly by recycled material it is very cheap and affordable.

There are many customers that need these kind of products. On the other hand there are many good products that nobody needs. So, what is our real purpose? We think that our main purpose is to give an answer to our customers needs.

By increasing our ways to sell our recycled material we can create a perfect recycling circle, obtaining also a clean factory and extra profits.



Mitsuya Miyamoto (translated by Alberto Ferrari)

A visit from Mapei (Italy)


At the beginning of this month Mr. Giorgio Ferrari, senior researcher at Mapei labo in Milan, came to visit us in Izu Nagaoka.

Our goal, together with Mapei and the GNN Alliance, is to reduce the CO2 emissions and to solve the problem of concrete waste in Japan.


We have been knowing each other and worked together for about 8 years.

We are that close that sometimes I naturally start speaking Japanese to him.

This relationship helped me a lot also to improve my English skills, as I had to get over the language barriers to communicate with him.

It helped me a lot.

Giorgio's invention, the so called IWA System, started by putting a water absorbant polymer and an accelerator into the concrete mixer's drum.

By doing it this way many problems came out and we weren't able to solve the problem of concrete sludge. So GNN came together, to find a solution.

Together with Mapei, of course.

And we found it!

It became our remaining concrete/sludge recycling system.

As concrete is the most used material in the world, after water, it produces also a lot of waste and a lot of CO2.

The most troublesome part of the concrete waste is represented by its sludge.

In these 8 years we worked a lot on this and we've found the best solution.


In the above pit are mixed remaining/returned concrete, sludges and Mapei's Re-Con Zero EVO polymers.

This by component powder is used not only in Japan, but also in many European Countries, in Australia and in the U.S.

If every RMC factory would start using this system we will solve the concrete waste problem all over the world.

Giorgio Ferrari after visiting us went to Hong Kong, to visit a RMC plant where they are interested in using the same system.

It is spreading all over and we will put our efforts to help this process, with Mapei and GNN.


Mitsuya Miyamoto (translated by Alberto Ferrari)


Good things

Everyday we have a lot of works to do in NR.
Every week, we accept some visitors from other companies. General contractor, reserch institute, RMC factory etc. 
They want to see our new technologies. High standard concrete, latest ICT system, return concrete solution and so on.
Soon they could understand about it. Those technologies have already been known. Then they got a good feeling.
But only a few person will use them. Why they can not do after watching? Because they don't put a dead line for applying them. They got a good thing and good feeling. After, it's over.
Said someone that "A man has never bought a good one. A man will buy the want or the need.
I hope them to find what they want in NR. So we are showing all, everyday everytime, to everyone.

Plan B

Everyday we have a lot of works to do out of NR.
I have been often confined into an express Shinkansen. At beginning of this week, big earthquake have struck in Osaka-Kyoto area in Japan. At that time I have taken a train to Fukui by way of Kyoto.
So my train stopped at Shizuoka station, about a quarter of the way. The passengers couldn’t do without waiting around the train. We were happy that the train stopped at the station area. So we could get off the ground. Some of the others were not at the train stations.
3 hours later, finally my train started to go to the next station, slowly. But the train often stopped and went. It was completely stopped again at Gifu-Hashima station, nearby Kyoto.
Conductor gave us information about situation was bad. “This train needs to wait here until over 3 express trains passing us.” It seemed to take over 3 hours at least. 
I thought that I should give up to go to Fukui or not. Then I found a rent-a-car signboard in front of the station. I called the number and asked. “Can I get off the leased car at Fukui?” “Of course!” the reply was shiny and quickly.
2 hours later, I have been in Fukui by car. And I could finish my appointment in the day.
I have often been confined into a train. This time, these experiences taught me that there was another plan to arrive at destination. 
That day, all of the express Shinkansen around Osaka area were delayed and stopped. A lot of people couldn’t back home in the day. So I’m happy. If I didn’t change the train to a car I could have joined the group who was waiting me the next day. I've got a good choice.

A unique concrete

Everyday we have a lot of works to do in NR.
I went to a job site which is a reseaching center. It's called "Japan Construction Method and Machinery Research Institute". So it has a big area, great machines, real scale models in Fuji, one hour distance from NR.
Usually, we don't used to delivery such the place. But they couldn't find how to be delivered fresh concrete with such a special mix. Then they asked us "Could you do it?". We replied "Sure!".
Later, we have deliveried them the unique concrete by using highway.
Soon the job site has been finished in safety.
They had a trouble, they needed a help, they wanted to do an experiment about the concrete.
We are able to work with you everyday, everytime, everywhere, as much as possible. Anyway, please ask us by way of trial.
Takema Futami from NR.

Great day

Everyday we have a lot of works to do out of NR.
This week, Mr. Giorgio Ferrariis coming to Japan from Italy. He is the RE-CON zero(IWA) developer. When he arrived Narita air port, we caught up him. And soon we visited an RMC factory near by Narita which Osato block Indutry.
It is a new user that IWA system. The president is smart guy. He has a quick response about our proposal. 
IWA is working now though they have gotten the powder only one month before. 
The GPS application which used our factory will work next month. 
When he was asked to join about new operation for drum's deposits breaking machine. He said at that moment. I will! I do. I do." 
Some projects are going at the same time. It is a few type who has quick response as president. I got a comfortable feeling from him.
Then I saw Mr.Giorgio. How feeling for him that RE-CON zero is starting to increase in far east island country. So I got a very comfortable feeling from them.
Takema Futami from NR labo.

NRTimes International Vol. 22

NR times Intl. Vol. 22_01.jpg

NR times Intl. Vol. 22_02.jpg

Periodic updating

Everyday we have a lot of works to do out of NR.
This week I have been to Tokushima in Shikoku island. I met some people who engaged RMC. President, employees, advisers and so on.
It’s a happiness when they welcome me when I visit. They asked me about our new product, trial, information. They knew well our company. Sometime I have just been known them new work in NR. Why? They have read well our website.
The website has unlimited possibilities. So, other RMC companies started to make their own website. Colorful, beautiful, unforgettable. But the first priority is periodic update. Our website updated minimum 3 articles at a day by president. So that is why outsider knew well our company ‘s news.
The blog is very useful tool. The website often gave us new jobs. If you have no website, let it challenge for marketing. When you have a question, please ask us anytime.
Takema Futami from NR labo.

The purchaser must dispose the sludge/waste by himself


Following the news from Mie Prefecture, we now have another big news from Tokyo!

When we went to visit Mapei last month we had that big news from Mie Prefecture:

"Remaining/returned concrete is officially a waste" and as a waste must be disposed following certain rules and at fixed (high) costs.

Of course, many people don't follow these rules.

Until now, nobody wanted to deal with concrete waste, nor RMC companies, house makers, construction companies, nor pump companies.

But as rules are getting stricter almost everywhere, now everybody is concerning and we must get together to solve this problem.

2020 Olympics are getting closer.

Now also Tokyo officially sets its rules.

Once Tokyo starts to move all Japan will move.

We as GNN will lead this change.

Will keep you informed!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Concerning to returned/remaining concrete, we must take decisions fast!


Osato Block Industry is a company located in Tsukuba, Saitama Prefecture, in the northern part of Tokyo.

Last month the President Mr. Osato and Mr. Takeda came to visit us in Nagaoka.

Until now they used to wait until the sedimentation of sludge and waste water.

Then, after 2 weeks they scraped out the sediment with a loader.

These kind of waste have very high disposal costs, constantly raising.

This type of process has been used for many years, but now it came the time for a change.


The visit started at 6 am, to see the IWA process from the beginning.

Now almost every RMC plant is trying to find a better and cheaper way to deal with its concrete waste, because the disposal costs are raising everywhere.

Now there are  mainly 2 ways:

- transform fresh sludge into cakes with a filter press

- make returned concrete harden, then break it and throw it away

With the GNN's IWA System we don't need these old systems.

In just 2 days our returned/remaining concrete can be completely recycled.

By using a slit water tank and 2 pits (1 for returned concrete and 1 for sludges) we can treat our waste at a 100% rate. Of course with the addition of Re-Con Zero EVO powder.

The recycled material can be re-used as filling material or into a new fresh concrete (non-JIS).

So, Osato entered the GNN group  and started to use our innovative system.

We hope to help also other RMC plants to semplify their work and cut their costs for remaining/returned concrete disposal.

This is the main goal of the GNN Association.


MItsuya Miyamoto (translated by Alberto Ferrari)


Guess the status

Everyday we have a lot of works to do in NR.

Sometimes we have an event from labo called “Guess the Slump and Air”. After morning meeting, we call delivery drivers and office staffs. We give them an information about rules.


Then the slump award winner will get a prize that's a prepaid card. Soon the fresh testing would start. The truck mixer discharge a few concrete to a handcart. Then all of guys guess the fresh status. During the fresh test there's no labo members. First a driver took it.



Later, office lady have done it. How the result? Slump 18cm, Air 5.3% Who is the winner? “I got it !” One guy get the correct number of Slump. But no one has guess the correct Air. All NR staff include drivers should know those status on fresh concrete. The Slump award is good operation for quality control. Because we can find the out products before delivering by our staffs. Unfortunately I cannot join the award because I’m in the labo. So I wanna get the prize like them.

Takema Futami from NR labo.

Like a student

Everyday we have a lot of works to do out of NR.
GNN could give us many opportunities to exchange each opinions. This March, I met a man who's teaching at National Institute of Technology Kagawa college as associate professor. I heard his presentation in GNN Kagawa. I agreed his opinion.
After speeches, I had self information to him. Soon we found to have the common friend who we knew each other.
Later we talked about each job and we interested in each works. I invited him “Please come to NR in Shizuoka when you have a chance to visit Tokyo area.
Now before he come, I have a chance to visit Kagawa again. I asked him “Can I go to your college?” He replied “Sure”.
Now I am joining his class as observer with 20’s students. They are young, pure and shining! This is a time that long time no see since I graduated my school.
I heard the physics lesson. Integral, algebra, spring constant and so on.
There are hard works to understand well. So I am writing this report behind teacher’s back...
I feel that teaching work is great. A high level teacher can make cleaver students. This is good experience for me. Thanks for him.
Futami Takema from NR labo.

The correct method

Everyday we have a lot of works to do out of NR.
This week, GNN has opened a new content as education in Yokohama. That is the GNN Academy. It has one simple goal, pass a test which is concrete qualifying examination in Japan.
The exam has many kind of fields. Knowledge of concrete, science of cement, caluculation of plan etc. It is not an easy work for examinee without studying.
The Academy prepares to study of 70 hours with a teacher. The teacher Mori is great! I joined the schooling as an observer. After scool, I got a systematic knowledge about concrete world. Production technique, chemical formula, industrial standards and so on.
The teacher gave us logical explanation from basic area. He said, "Memory work is nonsense. It does not work in another situation. So we need to know a relation around concrete fields".
There were over 20 students in the room. They made some teams for taking conversation. The teacher gave them some questions. Then they tried to answer with team members. It was very good opportunity to get friendship with each other.
Now, the Academy has another site for web students. You can take the schooling in your office at anytime. If you want to join the Academy, you can do it. Please call us. Don't miss the chance.
Futami Takema from NR labo.

Cheap doesn't mean bad quality (ECON)



Usually cheap things are associated with low quality.

If something has a set price it means that the seller gets a profit from that.

So, if the final cost is cheap also the raw material's cost is cheap.

We spoke a lot on this blog about our system for concrete and sludge recycling, the so called IWA/Re-Con Zero EVO System.


This System allows us to recycle our remaining/returned concrete and its sludge and re-use them as raw materials for recycled concrete, named ECON.

Of course recycled materials are cheap, because the raw (recycled) materials are cheaper.

At NR we produce and sell ECON everyday.

The selling price is about 3000/4000 yen cheaper than normal concrete.



By using ECON we have less bleeding and so it dries faster than normal concrete.

This is a good thing in winter and makes things a little bit difficult in summer as it dries too fast.

Cheap means bad only for the Concrete Association, but it is something good for us and for our customers.

So we will continue to try our best to please our customers, by giving them cheap but good quality products.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Huge unique event

Everyday we have a lot of works to do out of NR.
Last week, we have been to an event named the "World of Concrete Europe" in Paris. The event was together with "Intermat". Intermat is one of the 3 bigger events as "International exihibition for construction and infrastructure".
So there were many kind of heavy machines. Big mixers, large trucks, high cranes etc. Those exihibitions came from a lot of countries. United States,Italy, Germany of course France and so on.
When I step into those areas, the person in charge came and told about exhibit in French. I said him "I couldn't understand your language". Then he called his colleague who could speak English. Soon I got the detail of machinery. The participants were very kind for everyone.
The event site was extremely large. So visitors couldn't watch all over the site in one day. Everyone got tired just from walking. But in this situation, I got some hints for our works. I feel that we need to know more about the unique concrete world.
Takema Futami from NR labo.

The world about Concrete

Everyday we have a lot of works to do. This week, we are visiting EU to meet with foreign companies. In Italy, we got good informations from MAPEI. About products, progress, strategy and so on. After meeting, we arrived at the real job site which we were talking about. Next day, we moved to France. Soon we joined a great event which is the Intermat and World of Concrete EUROPE. Anyway those exhibits are all big! Truckmixer, dragshovel, bulldozer etc. Then we met a business partner named Command Alkon. They invited us to see a French concrete factory.This visit gave us some great opportunities for next strategies. The experience of going abroad made me feel better about working. In the world, person who treating concrete has same attitude. Thanks for all meeting.

It can be done also by using a wheel loader!


Recently we and one of our customers and business partner, Fukui Prefecture's Kawabata Kogyo, tried to see if it is possible to perform the IWA System by using a wheel loader, also because many plants don't own an excavator.

By the way we at NR are still using our pool/pit system. You can find a detailed explanation in one of my previous posts:



We are using 3 different pits, one for remaining/returned concrete and the other two for dirty sludge waters.

Everything is done by using an excavator, but for a company that does not own one it doesn't fit.

So we tried to do everything by a wheel loader and it worked!

In the video below you can see the demo that took place at Kawabata Kogyo:


We also tried at NR and it is really easy to be done.

Just create a space to throw in the returned concrete (it can be done by using some concrete blocks), pour the RCZ EVO powder over it, taking care that it is spread well on all the surface and mix with the loader for about 10 minutes.

We think that this could be useful also abroad, not only in Japan.


The reaction of Giorgio to the video says it all:)

By doing so all the Japanese RMC factories can get rid of their concrete waste in a very easy way!

We will continue to find the best and easiest ways to solve the problems that concrete factories face everyday.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Parallel projects

Everyday we have a lot of works to do.
In NR, we held many kind of meeting. During those meetings we decide a lot of projects.
Sales, technical, factory and so on.
So we need to share own situations. We always use a projecter. Last day, I hung 3 of them.
One in meeting room, one in office space and testing area.
The projecter is showing everytime many parallel projects. We can know how many tasks we have been doing in real time. And we can see it everywhere at the cloud, too.
Our staffs is moving all around Japan from north Sapporo to south Okinawa. Information Technology gave us the free style working. Soon those are changing day by day. We need to follow the news.
Well, I'm writing this out of NR area.
Which do you want?
You follow the works, or the works follow you.
Takema Futami from NR labo.

Quick response

Everyday we have a lot of works to do in NR.
Recently we accept to do some experiment on samples we got from some technical research centers. Ordinary test pieces, bending test pieces, viewing samples and so on.
Now we made a box for the testing. Soon we got a good response from the client. Then they gave us a next offer for another test. They want the 20 samples boxes!?
I quickly bought those materials. Nails, oils and machines. Then I cut it as many parts. Now I asked my colleague to be able to help me. He said “sure!” and he built those parts.
Finally we get to prepare the next experiment. We needed only two days to prepare 20 boxes. This time of presence is great. If you want a quick response to make something. Please ask us. We may help you when you have no time. Although it is not cheap cost. Thank you.
Takema Futami from NR labo.

NRTimes International Vol. 21

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A big guy, like a dinosaur, from Fukui

Everyday we have a lot of works to do out of NR.
Last week, I went to visit Kawabata-Kogyo, which is a concrete pump company in the Fukui prefecture. The president Nakamura is an innovator. Now his ordinary job is concrete pumping. Beside this, he works on many kinds of return concrete. Press pipes, precede mortar, overflow concrete etc.
To tell the truth, those return concretes should be treated by the user and not by a pumping company nor RMC company. So we need to talk about approaching return concrete around all of them.
When I visited his company I got a surprise. His company has a lot of things not pumping related.
We decided to walk together, because we have the same problems with return concrete.

Possibility of flying vehicle

Everyday we have a lot of works to do out of the NR.
This week I am in Okayama. That’s because I need to get a license to drive a drone.
I have never known that the name of drone is not ordinary. It is called “UAV” Unmanned aerial vehicle or “UAS” Unmanned Aircraft System.
The lesson takes 3 or 4 days. At first, classroom lectures about history, machine system, raw and so on. Next, implementation training on the ground.
I knew that we can drive the UAV easily from GPS or GNSS. Every time we  can be caught by over 10 radars. Then it make us safe, driving the air. Although in the final exam I couldn’t use GPS. The students must drive without radar assist for emergency. 
Well, why RMC company needs this technology? Because the UAV system has unlimited potentials all over the architectural world. Unsteppable area’s view, measuring system, material integration etc.
If you touch the technology, you may think about those possibility on your works.
Thank you for the school, Shiraishi Corporation.
Best regards to the principal Miss Yoshida.
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Our concrete/sludge treating system


What we need:

36~60 m2 free space

3 pools (slit, drying aeration process, remaining concrete treatment)

2 days to transform the waste into a new recycled material

Ways to reuse the recycled product (aggregates, Non-JIS recycled concrete)

Production cost about 500 yen per ton

1 person, 15 minutes a day in the morning and evening

The returned dirty water is disposed into the slit.

Then from the evening to the morning the water is let out through the fence.



This is what remains in the pool the next morning.



Then the hardened sludge is moved into the near pool.

From there it is then moved into the third pool and mixed with returned concrete and Re-Con Zero EVO powder.



In about 10 minutes we can obtain a new granular material, that can be re-used as aggregates or into a new recycled concrete.



Some space is needed to stock the aggregates.


We wait you here as we want also you to become part of this great project!


Mitsuya Miyamoto (translated by Alberto Ferrari)

The RMC Industry's door openers


Last week we received a visit from Mr. Ida, Towa Archs production director.

Towa Archs (Ida Group) is Saitama Prefecture's biggest RMC Group, based in Higashimatsuyama City.

I think that's very important that such skilled young people will lead our RMC Industry in the future.


They came to our plant to see our system for concrete recycling.


As you probably know already we set three pools, where we treat our returned concrete and concrete sludge and transform them into a new recycled material.

Even if it was a rainy day we were able to perform our demonstration as usual.

I feel like we are the "door openers" for concrete waste recycling.

Remaining/returned concrete is an everyday problem, for every RMC factory.

If you don't treat it before it hardens, then it will take time, a lot of space and big efforts to be disposed.

The same happens for sludges.

But we all know that the usual RMC worker's mind is narrow, as the range for concrete delivery (1 and a half hour).


We hope that this young leader will help us in the near future, to bring the old RMC Industry to a new life.

We are the door openers!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Job rotation

Everyday we have a lot of works to do in NR.
Now, we are doing a job rotation for all NR staff.
For example a sales person shifts to the factory section for one day.
A factory person shifts to office.
A office person shifts to sales.
It will be a good opportunity to know each other's works in the company. Also, we need to get more communication with another area's workers.
Last day, 2 members of our staff tried to take a fresh concrete test.
Must take care of feet position, push depth, put off speed and so on.
Those things should be done accordingly to JIS.
It is difficult to learn by doing only once. So we will take more times for learning.
And then, I need to try other works. What will I do? Soon the job rotation will give us another possibility for all NR staff.
Takema Futami from NR labo.

iCON, the Mie Prefecture's version of ECON



Last week Mie Prefecture's RMC plant and GNN member Iwano Kogyo has launched its version of ECON, recycled concrete. The name is iCon.

As we already said before, it is very important to find many ways to re-use the recycled granular material made by using the Re-Con Zero EVO powder.

If not so, the money spent to buy the powder becomes just an additional cost for the company.

In our case and also in this case instead, the obtained recycled material can be re-sold to new customers, that want to buy and use cheaper recycled concrete but with the same characteristics of a normal concrete.

It's  a double plus situation.

Save money by not throwing away returned concrete and earn money by selling new recycled concrete.

A very important step, especially for small medium RMC enterprises.


These pictures have been taken at an Iwano Kogyo's iCon jobsite.


Unfortunately Japanese people, in the construction Industry, are not yet used to recycled concrete.

The Concrete Industry is an old establishment and people are still believing that the only method that must be followed is represented by the JIS.

Of course it has very good rules, that allowed us to build safe and strong buildings for more than 70 years, but it is old. Extremely difficult to renovate.

As world is changing, also the Japanese RMC Industry must follow the changes and adapt.


Almost every week we receive a visit from people from all over Japan, interested in our innovative method for concrete waste recycling.

We are now in a perfect balance situation between everyday's returned concrete amount and everyday's request for recycled concrete ECON.

A perfect circle.

Every m3 of returned concrete is treated and re-used into a new concrete.

We are working to bring the same perfect combination in every Japanese RMC factory.

Keep following us!


Mitsuya Miyamoto (translated by Alberto Ferrari)

The other RMC plants

Everyday we have a lot of works to do in NR.
We are visiting other RMC companies quite often. Why are we doing it? Because we recommend them the IWA system, which is very innovative.
It is not complicated. It is composed by two different types of powder. And it is not difficult to apply.
A powder and B powder, thrown into returned concrete at once. It's over.
But sometimes we got a bad report from users.
Solidify, unsolidify and so on.
On the whole, the reason was the same pattern.
Powderless, powderful, not enough agitating etc.
We got a lot of failure examples from own experiences and the others. So we hope them not to face the same failures.
Last day, I went to Atami company's Inamura RMC with Alberto. We got some comments from them. Different areas have different custom and rules. It couldn't be done without face to face talking.
To visit other RMC plants is very interesting for me. There are many real facts. Well, where will I visit next?
Takema Futami from NR labo.

Fastening on concrete

Everyday we have a lot of works to do in NR.
Today, I went to a nursery school. Why did they called me? Because they want to put a hanger on the wall. But it is a concrete wall. So they couldn't do it.
When you want to fasten a concrete material, there are some different ways. A preset type, plug-in type and non plug type. Now I took the non plug type by using a screw for concrete.
At first, we need to drill a hole. Next, fasten in carefully, without stopping. Be careful! If you stop on the way, you may break the head of the screw. One more thing,you need a concrete drill, concrete screw and hammer drill.
It is a little difficult. When you have some fastening plan on concrete please ask us easily.
Takema Futami from NR Labo.

Our recycled sustainable concrete has been used at Nirayama Hansharo (World Heritage Site)


Nirayama Hansharo reverberatory furnace has became a UNESCO World Heritage Site in 2015.

It was built in the Meiji era.

This time our recycled IWA concrete (also called ECON) has been used at a jobsite there.

As you probably know we at NR take care a lot about the environment and for this reason we are putting a lot of efforts into unused/returned concrete recycling.

To do so we, together with Mapei S.p.A., have been able to create a new system called IWA System to recycle our concrete waste.

Once we transform the unused concrete into new recycled aggregates by mixing the Re-Con Zero EVO powder, we must be then able to find some ways to re-use the obtained granular material.

It's all about creating a good balance between input and output.

We have mainly to ways.

ECON, the new recycled concrete and also use the recycled aggregates as road sub-base material.

Below you can see some pictures taken at one of our jobsites, at Nirayama Hansharo.




As you can see there is no difference between this and a "normal" concrete.

But the Japanese Government still doesn't allow to use recycled concrete in public jobsites. The only way is to reach the so called JIS (Japanese Industrial Standards) and for small medium companies like our it's almost impossible.

But we will not give up our project, as for us the natural environment and the natural resources are very important.

In a period in which natural resources are becoming fewer and fewer almost everywhere in the World, we must be very careful not to waste any of them.

We found a good way to transform concrete waste into reusable granular material and we will not give up doing so and improve our system!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Ryukyus spirits

We have a lot of works to do in NR.
Recently our company was visited by a lot of other companies' staff.
From Gifu, from Okayama, from Kumamoto and so on.
Yesterday they came from Okinawa. They flied to Haneda by the first morning plane. Then they took a Shinknsen to Mishima. At noon, they reached our plant. The trip is over 1600km distance and it has taken about 5 hours. Great journey!
They want to know about NR's productrs. So they studied before coming. I felt their enthusiasm. I asked one of them about what are their plans about our products.
LSS, IWA system and water permeable concrete. They were mostly interested into our “Liquefied Soil Stabilization Method”.
Presently in Okinawa they have never used the LSS. If they get the method, they will be known as the pioneer of LSS in the island. I’m sure they will do. Because they have a hot spirit for new technology. I hope this will help them.
Everyday we welcome many positive guys. Please visit NR without any hesitation.
Takema Futami from NR labo.

Guys from Vietnam

We have a lot of works to do in RMC plant.
I went to Shiraishi RMC in Okayama for a one week training. Then I met some workers from Vietnam. There are 4 in Shiraishi. One guy can speak Japanese well. The others speak a little. Greeting, replying, reporting and so on.
They will stay for 3 years. If they can speak Japanese well, soon they can be interpreter for Japanese in Vietnam after. All of them are young, around 20 years old. However they couldn’t go back home for threee years, except in case of death of some relatives.
They are studying Japanese after work. Shiraishi makes them write daily in Japanese. The president check the sentences, everyday. I saw the same relation between teacher and student. So I feel that it’s not only about employees but also family. Shiraishi RMC has an active atmosphere. 
I was asked by one of them “Where did you come from?”
“I’m from Shizuoka prefecture. Do you know?”
“I don’t know. Is it near by Tokyo?” he asked.
I answered “Just a little. Mt. Fuji is there.”
“Oh, great! I want to go there.” He replied.
I hope, someday he can see Mt. Fuji at Shizuoka.
Takema Futami from NR labo.



NRTimes International Vol. 20

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Do all the common tasks properly

We have a lot of works to do out of NR too. I am visiting Shiraishi Kensetsu in Okayama Prefecture. It’s a trial trainee which consists in an exchange of employees of the laboratories. A member of their staff came to Shizuoka and one NR staff went to Okayama for a week.


Okayama prefecture is an historical place. Some ancient views, a famous garden and also a famous traditional character's born place. The name of the legendary character is Momotaro. Now I came here and felt that's bloody colder than Shizuoka! The river is frozen in the morning. There are freezing cars. A water line was stopped by cold air.



Though I met some nice guys at Shiraishi. The president, the manager and employees. I'll introduce you the man who's working in the testing room. He is doing some multitask alone. The material's control, answering for offices, a variety of tests and so on. I asked him “Why are you alone with such a multitask?” He replied that “Delivering comes first.” My works are another side of the business. The deliveries give us profit. Then he has done all the common tasks properly today too. I met a guy who's master of testing room. And I’m glad to help him as much as possible. Another company gave me another viewpoint.


I want to learn more from Shiraishi.

Takema Futami

Correct order for right ability

We have a lot of works to do in NR.
Our water permeable concrete is called “DRY TECH”. It has many valuable properties. Quick, easy, can be placed everywhere, etc.
But when the placement is not done correctly, those properties won’t work. One example there can be a problem of thickness. The permeable concrete has many slits for water path. So it needs over 100mm of thickness to be efficient. If it is too thin, the plate will crack, warp and be out of level.
The reason came from our long experience. We are often asked a lot about it. Now we need to explain the correct order of placement. Then I made a paper to describe it.
We took a meeting with sketches, pictures and computer aided designs. The draft design is finished. Soon I will show you the complete version.
Experience can help us more than text knowledge.
Takema Futami from NR labo.

Not waterproof

We have a lot of works to do in NR.
Concrete is a very strong material.
Hard, tough, heavy...
It has another important property. It is waterproof. This property gives us some protections from rain, wind, snow etc.
But in some cases, we prefer a water permeable concrete.
We recommend it when using it into a house garden.
At overgrow weeds, rain drop and car port.
When your car port is filled by snow, what will you do? At first must do shoveling. But if you put the concrete there, you can use just water for dissolving it.
Then the property has more merits for gardening.
 No need a drainage slope.
 Non slip from freezing.
 None stick out cracking concrete.
It's called "DRY TECH".
If you have any question, please ask us.
Takema Futami from NR labo.

Welcome to NR in Japan

Everyday we have a lot of works to do.
This week, we had had some visitors from South Korea. There are 18 people by the concrete company "Sampyo".
We gave some introductions about our plant's technologies. They were surprised and pleased.
 An easy cleaning system for the car drum.
 The fresh concrete Probe system.
 And the returned concrete recycling system.
When we gave the presentation, they listened very carefully. And after, they asked some questions which were really technical.
 How rheology?
 What kind of polymer?
 Where does the sludge go away?
They are real technical, too. At last a man said, "What a innovative system that is!"
We cannot break the time limit. It was so short stay for announcing all. But we might get a good friendship for each other. Because we are professional of concrete. I didn't feel a language border with them.
Next time, I hope them to prepare enough time for conversation. Now NR is going to be real international company. So we welcome you to come our plant for studying, anytime. Please feel free to call us.
Takema Futami from NR labo.
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A visit from South Korea


Yesterday a large delegation came to visit our plant in Izu Nagaoka, from Sampyo Group, South Korea.

Also the first time that we received a visit from Mapei I was wondering why such big companies are interested in visiting us, a small countryside RMC factory.

I feel very lucky.

Probably people around us feel and understand our spirit. Always moving forward, always be positive, with an eye to the future.

A few years ago we received a visit from a large group of Singaporean RMC Association.

Now from South Korea.



We introduced them our Probe System, to calculate and show in real time all the concrete's properties.



And of course also our IWA/RCZ System for concrete and sludge recycling.


Also in South Korea, as in Japan, this a big problem for every RMC factory.

And the usual solutions are almost the same as Japan.

Make harden and then break returned concrete or wash it and separate all the components and filter press for sludge cakes.

So they were extremely interested in seeing our very innovative solution, which allows not only to treat the waste, but to recycle and reuse them, creating new incomes.

We want to continue to find and develop new solutions, of course for Japan, but also for every business partner around the globe.


Mitsuya Miyamoto (translated by Alberto Ferrari)

The keystone for sustainable concrete in Japan


It has been a great honor for us to be on the latest number of Mapei's International magazine, REALTA' MAPEI number 66.



Our collaboration with Mapei S.p.A. started about 8 years ago and it is based on new solutions to treat and recycle concrete sludge and returned concrete.

It is a problem that every RMC factory around the world faces.

We, a Japanese countryside based RMC factory and Mapei, one of the world biggest concrete admixture maker, joined together to put efforts on this matter.

Now we are Mapei's exclusive dealer in Japan for concrete related products.

GNN members are also helping us in this Re-Con Zero project for concrete waste recycling.

Now we are trying to get some important certifications in Japan, such as Netis.

Every day we take a new and important step in the right direction, to solve every Japanese RMC factory's problem related to concrete waste.

We need everyone's help, as it is everyone's problem.

Let's join together, with GNN and Mapei!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Is it dangerous? or not?

Everyday we have a lot of works to do in NR.
This year, NR released a new product service. It's named "Diagnosis Cracks with NR". Sometimes we are asked about the happening of cracks, by owners.
Why does it happen?
What should I do?
Is it dangerous?
Those cracks look all the same to an ordinary person. But we are professional of concrete. We can sort if it is a dangerous crack or not. Why are we able to? We have the diagnosis qualification from Japan Concrete Institute. So we can pass the exam for it.
Then, when the problem is solved, those cracks should be fixed as before. Now we have a technique for repairing it. 
Where are those?
What did you do?
Amazing, isn't it!
If you have any questions. Please call us at ease.
Takema Futami from NR labo.
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RMC factory is a RMC factory after all


When we talk about remaining/returned concrete we must think about how to treat it and how to sell the obtained recycled material.

To treat it we can think about many different solutions.

To be able to sell the recycled material is maybe the most difficult task.

Even if we can treat it well, if we can't get rid of the recycled material it makes no sense.

One of our ways to get rid of it is to reuse the IWA aggregates to produce a new recycled concrete.

We call it ECON, if we use 100% IWA aggregates to substitute the natural aggregates and we call it Non-JIS concrete if we use up to 30%.



These pictures have been taken at one of our customer's jobsite. It is Non-JIS concrete and the name of the customer is Atelier KAZU.

The people working at the jobsite told us that the handling was very easy and the concrete was good as a "normal" concrete.

The main job of a RMC factory is to produce and sell RMC.

Besides that we are trying to open different paths, by selling recycled aggregates and treating and recycling sludge too.

We are still waiting for Japan's rules to change, allowing us to use our recycled concrete also in jobsites where the JIS mark is required. But it will take time.

For now, we can count on the support of local users, like Atelier KAZU, that appreciate our efforts to produce and sell a cheap, good and environmental friendly recycled concrete.

Later on, in the near future, also the big GCs will realize that we are on the right path and will give us their support too.

I believe.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Continuing to improve our concrete recycling system


If every RMC factory is worried about concrete waste, it is even more a concern for companies based in cold places, as for example Hokkaido or Yamagata.

When below 0 degrees concrete won't harden.

It is a big problem for RMC factories.

When this happens returned concrete can't be broken easily.

Also in Izu no Kuni City, home of NR, in cold winters water freeze, especially during the night.

So we needed a solution also for this.

And we found it. We had to found it, also because Re-Con Zero/IWA aggregates are mostly used and requested during winter time. This is due to the easy handling of ECON (IWA recycled concrete) during winter. Even easier than normal concrete, as it hardens faster.

By putting those lights on during the night the water contained in the sludge won't freeze and will continue to flow out of the fence, leaving just the solid part of the sludge inside. Those sludge will then be mixed with remaining/returned concrete and IWA/RCZ powder the day after.

Re-Con Zero powder makes the RMC factories work really easier.

Instead of letting returned concrete harden and then break it, in 10 minutes it can be easily treated by using a normal excavator.

Will continue also this year to promote and improve our IWA System!


Mitsuya Miyamoto (translated by Alberto Ferrari)

No need for a filter press


If I tell you that we don't need a filter press you probably won't believe me.

But I can tell you that we don't need it here at NR.

Without a filter press how can we treat our sludge?

A filter press has been used for so many years in the RMC factories that it is supposed to be used in every company.

RMC Industry is very close to changes. In fact it has been always a man's world, with very few women working in it.

Now time's changing and many things are supposed to change.


We want to take the whole Industry to a new stage.

At the end of December we received a visit from Kumamoto's Takano RMC's plant manager and director.

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They were very interested in our system to treat and recycle concrete waste.

So we showed them our everyday's work with the IWA System and also a jobsite where we used the recycled IWA aggregates to make a beautiful and cheap parking lot.


This is one of our ways to reuse these recycled aggregates.

Of course we need many different ways to reuse them. If we can't sell them we can't stock the aggregates as they will become too many to be stocked.

Not every factory will succeed in this recycling system, but we want to help as many companies as possible to become able to do it.

To succeed we need to have a strong willing to do it.

Thanks to Takano RMC for coming to visit us and I hope we will create a strong and good partnership!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Bookmarking(Another Dog-Year)

Everyday we have a lot of works during the holiday season at NR.
2018. This is year of the Dog in Chinese astrology, which is called Eto. Do you know it? It is cycling 12 animals as the signs, year by year. It is a kind of Zodiac of the Asian area.
It is used by China, Korea, Mongolia, Thailand, Vietnam and Russia. Of course Japan is one of them too.
Those Asian Countries used to take care of the sign for daily life during the year. Last year, my last job was to repair a doghouse. That was not good an environment for the resident dog. Raindrops, cold air, bare floor and so on.
It was a prize work that next year's sign animal would be good.
I was asked by the owner "Could you fix it?"
"Piece of cake!" I replyed.
I took the house apart to parts, put blace on beams, set it up together again. Then it would be stronger than before.
The resident dog seemed to be happy for living inside of it.
Now, the dog's year is coming. I introduce you some messeges of Dog's year.
Sociality, Dilligence, Uneasy delivery, etc. NR hopes to be good going with those spirits in this year.
Thank you and Happy New Year!
Takema Futami from NR labo.(Special thanks to the starring dog, Candy Miyamoto)

NRTimes International Vol. 19

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Japanese traditional Style

We have a lot of works to do in NR.
This year is going to end. It may be already ended for other countries, communities and companies.
But now, NR has still some important work within this year. What is it? That is to keep the warship place for traditional Japanese myths. In our office, there is no household Shinto altar. 
At the beginning of this year, NR office moved to a new site. Then the new plant started the works busily. Now we will finish this year's jobs without big problems. We have a good feeling of that.
For good next year, the office had better set altar on. Except for believers and not believers. In our world, there are a lot of amazing phenomenons. Sometime those have been called gods, evils, something great etc.
And then, it's an honor thing that I got the opportunity of setting it. Last day I've done it. After, I have heard that our owner was very glad. I'm glad, too.
Soon, New Year preparations will be completed in the office. How about you? I hope you will enjoy some good New Year's holidays. Thanks for all.
Takema Futami from NR labo.
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Invisible hurt

Everyday we have a lot of works to do in NR labo.
We made a reinforced concrete. What kind of reinforced? That’s a steel reinforcing bar. Before pouring concrete into formworks, those bars were not rust off. Those are being black, firm and shine. And then, the construction had finished soon, safely.
Some decades later, the concrete has been changed by a lot of factors. Heavy rains, strong wind, unpredictable earthquakes etc. So building owners need a diagnosys for concrete life. 
Now, NR can help them. Because we are a professional of concrete. Recently I went to check one of those old building.
I searched reinforcing bar by radar device along the concrete surface. When I get the point of bar cross, I aimed to make a core hole for checking.
Correct! I got it good point. Those steels were not rust. Afterward the hole was fixed as before.
Anyone couldn’t find the hole marks without information.
Takema Futami from NR labo.
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Great news from Iwano Kogyo!


Recently Iwano Kogyo's president's son entered the company.

In the past it happened the same also for me, when I entered NR.

In the beginning everybody saw me just as the president son.

Then step by step I was able to change this image.

Now he is in charge of Iwano Kogyo's IWA system.


In the past few months I've been travelling through all Japan with another guy that has the same background. Mr Nakamura, president of Kawabata Kogyo.

As time changes also the Japanese companies structure is changing.

Let's change Japan, young companies presidents!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Attention, you can win a prize

Everyday we have a lot of works to do in NR labo.
In our labo, a poster has been put up on a wall. It says "RMC symbolic character wanted".  And then, the prize is great!
Top prize is two hundred thousand JPY.
Sub prize is one hundred thousand for two persons.
200.000 Yen!?
You need to design its form, color and name.
Probably you're thinking about who can apply to this contest.
Don't worry. There are no application conditions. You don't need to be in concrete business. Everyone is able to join it.
One more thing, you can design three plans for it. The deadline is 28th of December. Last two weeks. It's sponsorized by the Zennama group.
If you are interested, then get this chance to win the prize with an unique Idea.
Don't miss it!
Takema Futami from NR labo.
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What's behind a concrete diagnosis

Everyday we have a lot of works to do in NR.

Our company can perform diagnosis of old concrete buildings, from the city's government. Some of those were built 40 years ago.
City office, elementary school, public hall, etc.
It's so interesting to check these buildings, that have been used for such completely different purposes. We need to pick the core out from each wall. Then we must repair the core holes, as soon as possible.
One building's  interior room was covered with wallpaper. Then I cut it carefully. 
Used a new razor blade. Attached to it a steel ruler. And stop my breath. So I cut it off. After, the core sample was took off safely. The holes have been filled by shrinkage-compensating mortar.
At last, I fixed the wallpaper with an expert glue. However there are a lot of works like this. And this is interesting for me.
Takema Futami from NR labo.


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NRTimes International Vol. 18

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RMC plant and coexistence with the local community


Last month our staff members Ferrari and Endo went to visit a RMC company based in Atami City.

This company is managed and owned by a woman.

It is not far from our plant in Izu Nagaoka, about 30/40 minutes by car.

Its name is Inamura RMC.

Recently they entered our GNN Association and are helping us a lot locally, for example when we need to rent a RMC truck for one day or two.

You can see the above blue RMC trucks running in the Atami area.


This plant is in the middle of a residential area.

They've asked us for a solution to solve their remaining/returned concrete problem.

Before moving to our new plant, we were also in the middle of many houses. So we felt in the same position of Inamura RMC. We needed a way to treat our concrete waste that wouldn't generate big noise nor a lot of dust.

As any RMC plant the produce concrete waste everyday.

People living near a concrete plant worries a lot about noises and dust.

We must always hear people's complains and try to do our best to avoid disturbing the neighborhood.

Inamura RMC has always lived together with the neighbors in a very good relationship.


The trial has been carried by using the RMC truck to transform returned concrete into IWA aggregates.


We, as RMC factories, are supposed to handle and do something about our remaining/returned concrete.

We have to do it in a way that doesn't bother who lives around us.

We are here to help all the Japanese plants to become able to do it.

This time we came to help Inamura RMC, a plant that is in a very good relationship with the people living nearby.

We'd like to take it as a model for the other RMC plants.


Mitsuya Miyamoto (translated by Alberto Ferrari)


R2, Concrete Pumping Association


Recently one of our pump machine companies business partner told us that he is receiving many inquiries about the R2 product (Re-Con Zero Pump).

R2 stands for REUSE and REDUCE.

The Japanese Concrete Pumping Association started to sell R2 last October.

It is used to treat and recycle the unused concrete that remains into the pump machine's hopper.


In this video you can see its efficacy on the remaining concrete.

Many inquiries come also from RMC companies, not only pump machines companies.

Of course then it will be necessary to let it be known also to the General Contractors.

Even if, its sale is limited to the pumping machines companies only.

For RMC companies and GCs there is our Re-Con Zero EVO.

But of course, also in case of R2, it is always necessary to receive the help and the understanding of the General Contractors and the nearby construction companies.

The puzzle we're trying to put together won't be complete without their participation.

We have been able to change people's minds about remaining/returned concrete recycling.

R2 will be a very important part of this plan.

Let's continue to put our efforts all together, everyday!


Mitsuya Miyamoto (translated by Alberto Ferrari)

A degree in concrete technology

Everyday we have a lot of works to do with our colleagues.
Last week, it was carried out a degree test. What kind of degree? Of course it's about concrete as professional. The test is not for ordinary persons. But if you are around the RMC business in Japan, you should try the exam.
Why is it ? Because you can learn a lot by doing this exam. It's called "Concrete meister". I give you some units of it. 
Basic materials, structural mechanics and quality control. 
Hazzard assessment, extreme situation and operation plan. 
Mixture calculation, unique concrete, pumping and so on.
In fact, I've been gotten many knowledge of concrete from the exam. Our 6 colleagues tried the test in Tokyo. I hope they have done the best of their abilities. The result will not be known until new year. Well, how many person will pass the exam? I'm looking forward to it.
Takema Futami from NR labo.

News about the IWA System price


Re-Con Zero, IWA  System, the solution for remaining/returned concrete recycling developed by the Italian admixtures maker Mapei S.p.A. and the Japanese alliance of RMC plants GNN.

Usually we sell the Re-Con Zero EVO powder only to GNN members.

We set this rule at the beginning of the GNN Association, to be sure that every user was really interested and ready to put efforts into our project.

GNN members are asked to attend our meetings and workshops and participate to the GNN life.

Until now we sold only pallets, but from now on we decided to sell also 1 or 2 boxes.

The price will be different.

In case of 1 pallet we set the price at 16 euro per set.

In case of 1 box it will cost 18 euro for 1 set.

So for example, with an exchange rate of 1:133 between euro and yen, 1 set will cost 2,128 yen in case of 1 pallet and 2,394 in case of 1 box.

1 pallet contains 39 boxes, in which there are 6 sets of RCZ EVO powder and so a total of 234 sets.

At the moment, the biggest problem which avoids our IWA System to spread more all around Japan is that it is not easy to find daily uses for the obtained recycled aggregates. The Japanese rules are not yet encouraging concrete recycling that much.

We must stick together, as innovators, to convince the Government to do more for concrete (and not only) recycling and re-use.

To do this we will continue to promote our solutions and technologies everywhere in Japan, with our workshops and forums for concrete recycling solutions.

We can't waste any day more for our families and for our children!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Yokokawa Cement's RIRICON


Since we started our forum for remaining/returned concrete solutions and technologies we got in touch with many persons and got many informations from all over Japan.

A few years ago Mr. Yokokawa, president of Maruyoshi Yokokawa Cement, contacted us to get some samples of WA21.

Then he decided to come to visit us in Izu Nagoka with some members of his staff and introduced us to his new material for concrete recycling.

Its name is RIRICON.

It has been presented also at the last GNN event in Tokyo, "Concrete to protect the people".


So we tried it at NR.


To treat 1m3 of remaining/returned concrete are necessary 3 kilos of it.

We used 60 grams for 30 liters of concrete.


Then it should be moved by using a shovel or a wheel loader.


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This is the treated material after 3 hours.

Mr. Yokokawa said that it is not yet a perfect technology and still need to be improved.

I always say that we'd like to help the Japanese RMC plants to find the best solution to fit their needs. Any plant, any factory is different from the others.

Then we showe them how we treat our returned concrete and we were able to exchange many information.

In the future we'd like to cooperate with Yokokawa Cement and continue to find interesting solutions and technologies for our business partners.


Mitsuya Miyamoto (translated by Alberto Ferrari)

GNN great conference

Everyday we have a lot of works to do in NR.
Last saturday I have been in Tokyo. 18th November is called "Doboku no hi" which means "Construction's day" in Japan. This is the day that GNN uses to organize an event for the people involved in the RMC business every year.
This year, the place was setted at Shinjuku. GNN prepared a big hall. Square 400m2, ceiling height 6m, setted seat 160+60pcs. That's a very large floor.
We were concerned about how many visitors would come. But indeed, the floor was filled up by people. Some person couldn't take them seats. So the event was completed satisfactorily.
Everytime GNN gives me a opportunity to encounter many persons who are alike us. And then I got good emotions and great friends.
Thanks everytime.
Takema Futami from NR labo.
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Unmatched wishes

Everyday we have a lot of works to do in labo.
A wish can not match with reality so easily. I took a test batch to do a reserch about the mold take off time. The builder want to take it off after 12 hours from setting. 12 hours!? Is it half of a day they want?
Nonsense! Concrete makers want to keep early curing as a priority. But builders want to shift next period of construction. However we need to do our best for our customers. Therefore we took the test batching.
One problem is the time table. 12 hours later is the same number both AM and PM.
5PM to 5AM. It's too early to move in morning.
6PM to 6AM. It's so early time for working.
So we choose 7PM to 7AM. Though it is late time for daily business.
Next day at 7AM. We got a natural result. The builder said "I'll be back 2 or 4 hours later." Soon he accepted the results about concrete.
It was a cold air in the morning. Winter will come soon.
Takema Futami from NR labo.


Everyday we have a lot of works to do in labo.
Last day, suddenly some concrete cores were brought to us by an architect who's one of our business partners.
He asked us to perform a test on them within two days.
"What kind of test do you need us to perform?" I asked.
His reply was not immediate. He said "I'll call you afterwards!" Later, he called me and told me two things: "At first we need a compressive strength test. Then also a neutralization test. We have to perform them on the same test pieces." Then he kept talking: "By the way, I promised the client that we can be present during the test tomorrow. Is it ok?"
"All right. I'll try my best." Then I searched for a solution of phenolphthalein in our labo. But I've found just an empty bottle. So I prepared the solution in a hurry, for tomorrow.
The next day, the architect came to our labo with the client. Soon, those tests finished, succesfully. He said "Thank you. Thank you very much! I trust you. I need you. I love you."
I don't want any praise words. I just want to do my job in the right way. It's my pleasure.
Takema Futami from NR labo.

The remaining/returned concrete forum at the next GNN Conference


The remaining/returned concrete forum will be present at the next GNN Conference, in the sub-hall.

If you weren't able to attend our forum about technologies to recover and recycle remaining/returned concrete in your local area please come to join ourn next GNN Conference in Tokyo.

As we always say, remaining/returned concrete is something that causes problems to almost every RMC factory in Japan.

So please join us on November 18 from 3pm in the sub-hall of Bellesalle Shinjuku Central Park.


You can call me at +81-90-1729-9893 or Alberto Ferrari at +81-90-1729-9891 for more detailed info.

Many experts will join so we can discuss all together about:

MORESTE (product that avoids to use 0,5m3 of mortar before concrete pumping)

IWA System (our system for remaining/returned concrete recycling, by using Mapei's Re-Con Zero EVO)

R2 (Re-Con Zero EVO/IWA System for concrete pump machines)

CELLDRONE (paper powder to treat small amounts of concrete)

Of course you're all invited to join also the speeches that will be held in the main stage.

So, we wait you here in Tokyo, on November 18!


Mitsuya Miyamoto (translated by Alberto Ferrari)

A strategy

Everyday we have a lot of works to do in the office.
I joined a meeting that was about our next business strategies, as NR. Our company has many different kind of meetings. For delivery, for sales, for IT and so on. At each meeting, there are the "right men in the right place".
Now we needed a new meeting to understand the current situation. We should share the routine strategies each other. Then we used the strongest tool. Please guess what is it?
Latest OS? Biggest monitor? Smallest gadget?
None of the above. We used a pen and a board. I think that it is the best for brain storming. All view, quick response and easy pointing etc. In the end of the meeting, a participant took a photo by mobile phone. It's a funny sight. 
After the meeting, I could share information with my colleagues on the board. It is a very useful tool, the white board.
Takema Futami from NR labo.
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Chip off the deposits

Everyday we have a lot of works to do in the plant.

I saw a scene of a driver that was doing maintenance of truck mixer at the engineering corner. The drum window was opened. And then there was a lot of noise, like a gun battle.
The big noise made me anxious, thinking about the worker in the drum. That's very narrow, dark and airless.
Several hours later, a guy got out of the small window, sweating. When he found me, he throw to me a big smile. Soon the deposits into drum were put out with another noise like a car ratle.
Hey, here comes a huge volume, isn't it!? It seemed over 0.5m3. Concrete has about 2.3 ton/m3 specific gravity. So the car put down over 1 ton of weight. The heavy laboring is not a waste of time and effort. Good job, guy!
Takema Futami from NR labo.

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An experiment with the Probe

Everyday we have a lot of works to do in labo.
Last day we made an experiment called the Probe system. What kind of probe is it? A space probe, a sound probe or surgical probe...
No no, we are handling RMC, ready mixed concrete. That is a concrete probe. Have you ever heard about this system? It'll make easier for us to deliver our concrete. This system indicates the concrete properties into the drum. Slump, temperature, volume and so on.
So we can know those properties without outing. Isn't it great?
It was raining, all day. The air temperature was low. I hope nobody caught a cold.
Takema Futami from NR labo.
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The legend has just started


In our company we have many ways to spread our recent news.

For example our NR Times magazine or our blog.

Internet has became a very important tool to expand our audience.

The most important thing is to continue to create new contents, for months, for years.

Of course, it is not easy.

One of our most important business partners, Mapei, has its own magazine, REALTA' MAPEI.

7 years have passed since we met Mapei, one of the world's biggest concrete admixtures maker.

They are present in 70 countries, with a turnover of 3.000 million yen.

Mr. Giorgio Squinzi is the CEO and until a few years ago he was also the leader of the General Confederation of Italian Industry, commonly known as Confindustria.



Me, Mr. Takenami from Shiraishi Kensetsu RMC and our staff member Alberto Ferrari with Dr. Giorgio Squinzi in Milan.


On one of the next numbers of Realta' Mapei there will be an article, written by Dr. Giorgio Ferrari (senior researcher at Mapei), about the collaboration between Mapei and Nagaoka RMC.

In Japan we focused on the solution of the remaining/returned concrete problem.

Every Japanese RMC plant faces this problem.

We must find a way to eliminate the concrete related waste.

For this reason we started the Re-Con Zero EVO project.

We, a countryside RMC company and Mapei, one of the world leaders in the concrete industry.


The above picture was taken about 80 years ago and shows the beginning of Mapei's history.

We will continue to do our best to make the concrete industry a better place.

About 5 millions m3 of remaining/returned concrete are produced every year (5% on the total concrete production).

So we, together with Mapei and GNN, must go on on this path, to remove and recycle these concrete waste from every RMC plant.

We have just started, but we are on the right path.


Mitsuya Miyamoto (translated by Alberto Ferrari)


We will give all the support they need!


Last week our staff members Ferrari an d Endo went to visit Iwano Kogyo's plant, in Yokkaichi City, Mie Prefecture.

It is one of our most recent GNN members.

They are very interested in finding a solution to treat and reduce their concrete waste (remaining concrete and sludge).

The person in charge is the president's young son, 27 y.o.


They use a pool like us.


And of course they're using Mapei's Re-Con Zero EVO powder.


Sludge and remaining/returned concrete are blended and mixed in the pool.



These are the obtained IWA aggregates.

At their plant they have a mountain of old sludge that becomes bigger and bigger everyday.

This happens in every Japanese RMC plant.

We will give all our support to people like the young Mr. Iwano, that want to reduce and eliminate concrete waste from their plant.

To be continued...


Mitsuya Miyamoto (translated by Alberto Ferrari)

A backache

Everyday we have a lot of works to do.
Last day, I got a huge lower backache. Why? Because of the slump testing for all the delivery cars at the plant. 
That day, I’ve had slump tests over 40 times. At first, the test took 12 minutes to to check the concrete's quality. Soon this pitch became faster and faster. 9 minutes, 7 minutes, finally it was 5 minutes for one test.
Iron plate set, slump cone set, throwing into cone, how about the condition? OK, let’s go! Then, cast away it and wash up. Next car is waiting.
5 hours later… the delivery was finished. Oh my gosh! I couldn’t straighten up.
The customer wanted to test for all products. Is it normal? It was hard for me, for us, for the company. So we may need more relationship for each other. And now, my backache is downing.
Takema Futami from NR labo.
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Gujo Ready Mixed Concrete, from Gifu Prefecture



The IWA System.

The Re-Con Zero EVO powder is able to switch time and place.


There are a few people that call us by phone.

We are known to be a RMC company.

We usually meet the same people.

And most of the times there is a trading company or the RMC local Association between us and our customers.

So the comunication is not always easy as we can't meet the customers directly.

So we started our RMC blog.

In the above picture you can see Mr. Takagaki and Mr. Uchigashima from Gujo RMC, based in Gifu Prefecture.





They came to visit us as they were interested in our remaining/returned concrete recycling solutions.

They have a big problem: they don't have much space at their plant.

Recently they became increasingly worried about their concrete waste and sludge and they're looking for a way to solve this problem.


So they started by asking to the local concrete association and the concrete plants in their local area.

"How are you treating your concrete waste?"

The answer is that they blend it with returned concrete as much as possible, but the problem is that if they blend it too much then the returned concrete won't harden.

So it is really difficult to get rid of sludges.

Gujo RMC then tried to find a better solution than this.

So they called us.

It takes about 4 or 5 hours from Gujo RMC to Izu Nagaoka.

So they had to leave their hometown at night to be at our plant in the morning. It takes them 2 days to see our demonstration.

It was a big step for them.

This is the kind of people we need in our group, to improve our remaining/returned concrete solutions.

We introduced them our IWA System.

They can produce recycled aggregates for less than 500 yen/ton and then sell them for much more.

Plus they can save time and labor.

It's time to start to solve their problem, for Gujo RMC.

And it will proceed fast, I think.

We will assist them as much as we can, to lead this remaining/returned concrete revolution.


Mitsuya Miyamoto (translated by Alberto Ferrari)


Can I buy it even if I'm not a GNN member??


A few days ago I went to visit a RMC plant based in Fukuoka City.

They told me that recently the place where they brought their hardened returned concrete pieces has been closed.

This is a big problem for them, as they don't know how to throw away their remaining/returned concrete waste anymore.

Usually RMC trucks with remaining/returned concrete are forced to bring these waste to some far away places, for the disposal.

So they asked me if they can buy our IWA/RCZ product even if they are not a GNN member.

It happens often.

In general, our technologies for concrete recycling are available only for GNN members.

We started our consortium for concrete recycling about 7 years ago.

We wanted to solve the remaining/returned concrete problem.

This is the reason why we started that group.

Since that day we made a lot of trials and of course a lot of mistakes.

The product named Re-Con Zero EVO has born.

Many times we've been asked "Can I buy a sample?" "How much is it?".

I understand this.

In my hearth I'd really want to give samples to anyone who's asking for them, but our philosophy is different.

We want to solve this problem all together, with our loyal business partners.

We need to meet regularly and discuss, at the GNN meetings and remaining/returned concrete consortium.

This is the way we need to follow.

All together.


Mitsuya Miyamoto (translated by Alberto Ferrari)



These are some examples of unused machines that were settled for concrete recycling, that by the way didn't allow to recycle also the sludges.

A product from South Korea

It's Takema Futami from NR labo!

Everyday we have a lot of work to do a good job.

Quality control, strength test, making sample pieces and so on.

Last day, I was introduced to a new product by our CEO.

He has many International connections. The product was sent from South Korea.

It is a resin mold for sample concrete pieces. NR has already another type of molds.

Then I tried to make samples with the new ones.

It was not bad. For example, weights lighter than metal, no need for tools for outing and has a good (cheap) cost.

I heard that this product has been used in Australia, Italy and of course South Korea.

At last, I tell ypu my favourite point about it.

The handling grip is great!

Because usually I can grab only two pieces at a time, but this grip give me only one action for carring three of them.

It's great!






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Thank you Mapei!


Thank you Mapei.

7 years have passed since we met each other.

In the above picture you can see the guy that connected us and one of the world's biggest admixture makers, Mapei.

At that time I wasn't even able to speak english.

So it was really a very important step for me and for my company.

My world became wider and my company became global.

Our collaboration is based mostly on solutions to treat remaining/returned concrete.

I have been struggling with this problem for about 17 years and finally thanks to Mapei we were able to find a solution.

7 years ago we brought into Japan the first 2 containers of Re-Con Zero powder.

At that time I wasn't really sure to be able to succeed.

But we did, with the help of all the GNN plants that took part of this project.

Now, once every 3/4 months we bring 1 or 2 containers from Italy into Japan. It became normal for us.

Mapei also decided to sponsorize us and made us a big gift.

A new tent to stock the Re-Con Zero EVO's pallets.

We must thank Mapei from our heart.

By using this system we can avoid to have a filter press system in our new plant and we are able to recycle all our concrete waste.

We became a 0 emissions plant.

The goal of solving the Japanese concrete waste problem is still far, but step by step we are expanding our solutions thru Japan.

In these last 7 years we improved and changed a lot.

We won't stop and we'll see what we can reach in the next 10, 15, 20 years.

It is our commitment.

So again, thanks to Mapei, for being a loyal and important business partner.

And thank you also for the tent, of course.


Mitsuya Miyamoto (translated by Alberto Ferrari)

The waste water treatment situation at the RMC plants after 5 years



It has been quite a long time since I started my blog by saying "Namakonnichiwa"! (Rmckonnichiwa).

On September 15 and 16 we hosted in our plant in Izu no Kuni City the workshop of Barchip fiber's maker Hagiwara Kogyo.

As I've already explained in a previous blog, Barchip fibers can be used in our recycled concrete ECON.

Usually they are promoted and sold by trading companies, not RMC companies.

So they wanted to use GNN platform to promote their product.

In those two days we also showed our way to treat and recycle remaining/returned concrete.



*The above video was taken at our old plant.

We, at NR, don't have a filter press to treat our waste water.

The fibers contained in the fiber reinforced concrete can damage the pump of the filter press system.

This is a bad point for the RMC plants.

But we don't have a filter press system, so we are not scared of anything.

Plus, we are able to recycle everything, from remaining concrete to concrete sludge waters.

For these reasons we will try our best to show and promote our system and solutions for concrete waste recycling and fiber reinforced concrete.

Of course, with the help of GNN and Hagiwara Kogyo.

And let's see what will be the situation after 5 years.


Mitsuya Miyamoto (translated by Alberto Ferrari)

The attitude of Toyama regarding remaining concrete is amazing


It happened that an order of concrete containing Facet (fast hardening admixture) has been made wait so long that the concrete batch became too hard to be used and had to go back to the plant. It was a big problem.

This time our concrete recycling technologies forum has been held in Toyama, on September 8.

It was the 21st concrete recycling forum for us.

We must thank Azuma Concrete Kogyo plant for hosting us and organizing a great event.

All their staff was present to help and working for the audience.

This is not very usual, especially in busy days.

About remaining/returned concrete we have many solutions to offer.

One of these is the IWA System.

We can treat 1 ton of remaining concrete for 500~1000 yen.

Of course I've introduced it to the audience and Azuma Concrete's staff had a great idea, to use it to treat remaining concrete containing Facet.

We are very happy when during our forums we can get many new ideas from the people.

They help us to improve our solutions everytime.

We must continue to improve and find the best ways to solve the concrete waste problem.

As concrete is the second most used material, after water.

The attitude of Toyama regarding remaining concrete is amazing!


Mitsuya Miyamoto (translated by Alberto Ferrari)

"Explain to me why you can't do it!"


It is a book written by Mr. Tateishi, founder of Omron.

During my business activities and products related meetings people often ask me "how much does it costs?".

It is always difficult me to answer.

It is not something you can answer so quickly and easily.

But I must try my best to answer in the easiest way, for example, when they ask me how much does it cost to treat the remaining/returned concrete.

I always answer 500~1000 yen per ton.

2,300 yen is the cost for one set of the product (Mapei's Re-Con Zero).

By one set we can treat from 1 to 2 m3.

So to treat 1 ton of remaining concrete and sludge we can say that it will cost about 500~1000 yen.

And of course, the disposal costs will be 0.

Now I will list all the main reasons why some companies are not able to use our system:

1) They are not able to find ways to sell the obtained recycled material.

It happens often.

Even if they are able to tranform their remaining concrete into a granular recycled material, then they are not able to sell it.

RMC plants are not used to sell something that's not normal concrete.

So it is not easy for many of them.

2) They have no space to stock the obtained material.

Another reason that I hear often.

There is no space to dig a pool and to stock the material at the plant.

Especially in the big cities the plants are narrow.

One way to avoid this problem could be the collaboration with a near aggregates producer, but even this seems not to be easy.

3) They don't have the right equipment.

This happens often when the goal is to re-use the obtained material to remix a new recycled concrete.

At the plant they don't have a grand hopper to put the recycled aggregates or they don't have a stockyard that they can dedicate to the recycled aggregates. Or, they don't have an extra bin.

One way to avoid this problem could be the method used by Okayama's Shiraishi Kensetsu: put directly the recycled aggregates into the truck mixer when needed, by using a transportation belt.

4) They are not really wanting to solve their concrete waste problem.

It is the most common reason.

I think that if you really want to achieve something you can do anything.

It is really easy to find a reason not to do something or to say that it is impossible to do it.

It was not easy for us when we started this IWA system.

But we were able to succeed and the main reason is that we really wanted to!


Mitsuya Miyamoto (translated by Alberto Ferrari)


Right in the middle of the plant


Here at NR we are not throwing away our remaining/returned concrete since many years ago.

We are continuing this zero emission system also in our new plant that we started this January.

To organize our new plant we took some ideas from many GNN plants.

And we decided to put our concrete recycling pool and equipment right in the middle of the plant, so everybody can see how we are treating our waste and transforming it into a re-usable material.


Depending on the conditions of the remaining/returned concrete, its slump, sludge and washing water, the process may take from 5 to 10 minutes.


After the treatment the obtained material is placed on the ground.

Then it is mixed together with previously made IWA aggregates and becomes itself part of the recycled aggregates stockyard.


Once required, the IWA aggregates are moved on the above hopper, where the too big pieces are removed.



When the remaining concrete comes back at the plant it is discharged into the pool. 

Then the drum is washed and the dirty sludge water is thrown into another pool (picture above).

After a while the water is made go through the red fence, leaving inside the pool only the hard part of the sludge (pic below).


This is then mixed with the remaining/returned concrete and treated by Re-Con Zero EVO.


The water is then treated separately and used again to mix our recycled concrete.

So nothing is disposed in our plant, but everything is re-used.



Sludge and waste emissions=0.


In the above pictures Mapei's Re-Con Zero EVO boxes, used to treat our remaining/returned concrete.



Then we made a demonstration also with CellDrone, the paper powder to treat small amounts of concrete.


Remaining/returned concrete happens everyday in every plant.

It is not easy to change habits and attitude, but we must do it.

It took about 10 years to us at NR to create this system for concrete recycling.

Of course it is not yet 100% perfect, so with the help of GNN members and the remaining concrete forum we want to continue to make it better and better.

Our goal is to make it easier for our young people, so they don't have to worry anymore about remaining/returned concrete in the future.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Pumping ECON!


Pumping ECON.

ECON is our recycled concrete, that we are producing everyday for our customers, since 5/6 years ago.

It is made by using recycled IWA aggregates, coming from remaining concrete treated by Mapei's Re-Con Zero EVO.

Remaining/returned concrete represents the 2~5% of our total concrete production.

In the pictures below you can see how our remaining/returned concrete becomes after the IWA/Re-Con Zero treatment:



So at our plant the remaining/returned concrete is transformed into a recycled and re-usable material.

We use these recycled aggregates to produce our new sustainable concrete, ECON.

In the beginning we faced some problems with concrete pumping machines, as sometimes some too big aggregates remained stucked into the pumps, creating troubles to our customers.

Since then we put a lot of efforts to eliminate too big aggregates from our stocked IWA aggregates, to avoid the same problems to happen again.

So now our customers can pump our ECON without worrying about anything.

ECON, our environment friendly sustainable concrete. Please try it if you haven't tried it yet.


Mitsuya Miyamoto (translated by Alberto Ferrari)


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Guide to the ECON production adjustment


One problem that we face with our remaining concrete recycling system is that sometimes we can't sell our products. We can't deliver them to the customers. So we have to find many ways to do it.

Since 7 years ago we are delivering our recycled concrete ECON to our customers, also using pump machines.

This time we sold it to one of our loyal local customers, SSS Kensetsu, as concrete slab.

Their president didn't know about it, so we had to do a brief explanation.

We started this project to solve our remaining concrete related problems and then we were able to produce a recycled concrete with very good performances, similar to a normal concrete, but cheaper.

It is named ECON and it is made by using our recycled IWA aggregates, in substitution of natural aggregates.

Now we are promoting this system all over Japan, to expand our knowledges and experiences.

Please continue to support us and to use our innovative products!


Mitsuya Miyamoto (translated by Alberto Ferrari)


Can we reach also the JIS standards??


We have a new friend, named Konjari Kun (Kon = concrete, Jari = gravel, Kun = has the same meaning of "san", accompanying names).

It is a machinery, produced by KYC, that our business partner Shiraishi Kensetsu have bought some months ago. Its main use is to transform remaining concrete into recycled aggregates.


This is an inside look at the machinery.


The transformed material is then transported by using this conveyor belt:


We tried to use this machinery combined with the Re-Con Zero EVO powder.

As you can see in the pictures below we can obtain very clean recycled aggregates and Mr. Takenami of Shiraishi Kensetsu said that probably these aggregates can obtain the JIS mark due to their good characteristics.


The cement paste has been almost completely removed from the aggregates.


They look like normal natural aggregates.

Then, after sieving them, we used them to mix and produce a new recycled concrete.




Slump 19 cm and a very good workability.


Soon or later, can we really reach the JIS standards??

This was a very good test by the way, please continue to follow us!


Mitsuya Miyamoto (translated by Alberto Ferrari)

The "Taiyo Concrete Kogyo case"


We continue to promote our solutions for remaining and returned concrete.

After visiting Kimura Kenzai in Nagoya and Iwano Kogyo in Mie Prefecture, Ferrari and Endo went to visit another important RCZ user and business partner, the Hamamatsu City based Taiyo Concrete Kogyo.


At the beginning we have been contacted by them through a web inquiry and now they became one of the best partners in this project.

By looking at the above video you can see how they are sieving their stocked IWA /RCZ aggregates. By doing so they can obtain the best aggregates possible, removing the biggest pieces.


This rotating attachment is named "Silent Amidas" and I really like this name too.



It is hard to believe that such nicely shaped aggregates once were remaining concrete.

Also remaining concrete can be beautiful!

Mr. Kondo of Taiyo Concrete Kogyo said that the fastest way to sell them is as they are, as aggregates for road sub-base, but they will be easily sold also as aggregates to produce new recycled concrete.

The main production of this company by the way is not RMC, but pre-cast elements. And Mr. Kondo said that he will try to use such nice recycled aggregates also for the pre-cast production in the future.

We will continue to travel thru Japan to promote and develop our solutions for remaining and returned concrete, so stay tuned!

For more detailed info check our website or contact me, Mitsuya Miyamoto at +81-90-1729-9893.


(translation by Alberto Ferrari)

The "Iwano Kogyo case"


Iwano Kogyo's plant is located in the northern part of Mie Prefecture.

The plant is owned and directed by two brothers.

They were looking for a solution to reduce their concrete waste (remaining concrete, sludge).

In the picture above you can see one of the two owners together with Watanabe, a member of our staff, that visited them with Ferrari and Endo.


The IWA aggregates, that can be used to produce a new recycled (Non-JIS) concrete, in substitution of natural aggregates.



Together with remaining concrete they're mixing also a part of sludges.

As said before in my blog, everybody is looking for the best solution to solve the remaining concrete/sludge problem.

There are many bad ways to do it.

For example, pay money to just throw them away, or re-use them in the next batch without informing the customer.

We want to find the best ways, to satisfy both the concrete plants and the customers.

For this reason we're travelling all around the Country with our remaining concrete solutions forum.

You can see the recent schedule in the previous post.

We're doing this in collaboration with GNN and one of our most loyal business partners, Mr. Nakamura from Kawabata Kogyo.

If we can solve this problem here in Japan we can solve it all over the world!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Remaining concrete festa's schedule (2017)


This is this year's schedule:

・22/5 in Okayama

・3/6 in Yamagata

・9/6 in Nagano

・14/6 in Nagoya

・24/6 in Kanazawa

・End of June in Kobe

・17/8 in Gunma

For more detailed info please contact me (Mitsuya Miyamoto) at +81-90-1729-9893.

At the same time our staff members Ferrari and Endo are travelling through Japan to check the situation at the GNN members plants that are using our IWA System and help if necessary.

Below you can see some pictures taken at Kimura Kenzaiten, in Nagoya:




This is the pool, where the remaining/returned concrete is treated with the Re-Con Zero powder and transformed in a recycled granular material.

Any GNN members has its own way to use our IWA System, depending on their needs.


The video at the above link shows how the IWA System can be applied also to treat the concrete remained in the pump machine's hopper.


And this is our way, in the pool.

We'll keep you updated on our remaining concrete forum's schedule.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Italy, again!


Italy is quite far from Japan, but it is very close to NR.

At first we started our partnership with Mapei.

We, a small RMC factory based in the Japanese countryside and Mapei S.p.A., one of the biggest concrete admixtures maker.

Our business relationship is based mainly on the treatment and recover of remaining/unused concrete.

This project started about 7 years ago.

That was the time when also our Venezia born and raised staff member Alberto Ferrari entered Nagaoka RMC.

Then, at the WOC of Las Vegas, we got in touch with MetalGalante CARMIX, an Italian company based near Venezia. They produce machineries for concrete batching directly at the jobsite.


Their president, Mr. Galante, joined us at the GNN Conference in Tokyo 3 years ago and then they started to collaborate with another of our business partners, Taiyo Kogyo, to import their machineries in Japan.

At the same WOC we met also Mr. Radici, from Radici Group, a chemical maker based near Bergamo, also in northern Italy. They used to collaborate with an American company in NYC, dealing fibers for concrete structures.


We're also running our Venezia-Izu Group here in the Izu Peninsula.


We started this project, directed by Alberto Ferrari, 7 years ago, to promote any kind of possible collaboration between our beautiful Izu Peninsula and the world famous Venezia.

In Japan Venezia is very famous too, of course, and we hope to help a growing partnership with it.

Last month came to visit us a representative of WAM Japan (Mr. Tanaka), the Japanese branch of the Italian WAM Group, since 1990.

He saw on our website our remaining concrete forum page and he was interested in knowing more about it.

So he came to Izu Nagaoka.


So they have been present in Japan for more than 20 years and they're specialized in belt conveyors.


So again, Italy!

Mr. Tanaka had a long way from Saitama to Izu Nagaoka and it remainded me a little bit about the first visit of Mapei representative from Milan a few years ago.

WAM Japan is very interested in collaborating with our GNN members, to develop and sell the best machineries possible.

This is why they will join our next meetings about concrete recycling.

We don't know yet what kind of results this collaboration will bring, but after our previous successful stories we can look at this in a very positive way.

To be continued...


Mitsuya Miyamoto (translated by Alberto Ferrari)


"For this kind of jobsite we don't need JIS"


As I wrote in a previous post, we launched our "Non JIS concrete (JIS-gai CON)". It costs 500 yen less than its equivalent with JIS mark.



This time I'll introduce you a work made by one of our most loyal customers, Kondo Gumi.

They are always interested in our new products and so this time too.

When we received their call the other day they asked for 0,5m3 of cheap concrete.

They didn't need the JIS mark, but of course they wanted a good concrete, easy to place and with a normal strength.

So we introduced them our non JIS concrete.

It has all the characteristics of a normal JIS concrete, but... it doesn't fit to have the JIS mark and for this only reason it costs 500 yen less. We can say that the JIS mark costs 500 yen for each m3 of concrete.

Like our ECON, it is made by (a smaller percentage) of recycled IWA aggregates and so it also helps us to get rid of our concrete waste and to keep our plant clean.

Thanks to customers like Kondo Gumi we can help keeping a clean environment and give our loyal customers cheap and valuable solutions!

Thanks Kondo Gumi!


Mitsuya Miyamoto (translated by Alberto Ferrari)

A drastic solution to recycle the concrete that remains in the hopper of the pump machines


In one of my previous posts I've introduced Mr. Nakamura, President of Kawabata Kogyo pump machines company and one of the future leaders of the whole Japanese concrete movement.

The video that you find at this link was made by him:


It shows the best solution to recover the small quantities of concrete that remain in the hopper at the end of a jobsite.

I think that it speaks by itself and no explanations are needed.

We must find solutions to problems as fast as possible.

And I can say that we are now working on the best solutions to the remaining/returned concrete problem, with the help of all our GNN business partners.

People like Mr. Nakamura.

I met Mr. Nakamura for the first time about one year ago, but we were able to establish such a good relationship since the beginning.

I think that by continuing to work together we can achieve any type of success!


Mitsuya Miyamoto (translated by Alberto Ferrari)

A RMC factory is a RMC factory in the first place


I think we've found a very good way to recycle our remaining/returned concrete.

As Mr. Giorgio Ferrari once said the "in house solution" is the best solution.

Yesterday we delivered about 50m3 and today about 20m3 of ECON, our recycled concrete, made by using recycled IWA aggregates.

We use to write on a whiteboard the jobsites list, day by day.

The above picture has been taken by Alberto Ferrari and it shows today's ECON jobsites.

As said before, ECON is made by 100% recycled gravel and sand plus ECO cement.

Also the water is coming from the washing water, so it is really 100% recycled concrete.


The remaining concrete that comes back unused from the jobsites is thrown into a pool.

At the end of the day (or twice a day), one of our operators mixes it with Re-Con Zero powder and by doing so, in about 10 minutes, we can obtain the so called IWA aggregates.

We can then use them to produce ECON (or Non-JIS concrete) or sell them as they are, for road subbase or back filling works.

As every industry, we are specialized in something. And in our case this is RMC.

We are not really known to be recycling materials experts or recycled materials sellers.

Our customers are really surprised to hear that we sell recycled materials, but it is recycled concrete, so it is our main field anyway.

Our main output is still RMC.

Below some pictures of our concrete made by using recycled materials:






Mitsuya Miyamoto (translated by Alberto Ferrari)


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The ECON production flow chart


By using the IWA Sytem we can obtain aggregates at a very cheap price, 500~1,000 yen per ton and at the same time cut completely the concrete related waste (zero emission).

Below you can find a simple flow chart about our concrete recycling system. The person in charge of it is our staff member Alberto Ferrari.


First of all, as you already know, the remaining/returned concrete is treated inside a pool by Mapei's Re-Con Zero powder.

By doing this we can obtain recycled aggregates (gravel+sand), that can be re-used to produce a new recycled concrete (we call it ECON).


These recycled aggregates are stocked in our new plant.


When needed to produce ECON, the aggregates are taken by using a loader.



...and poured into a hopper (of course, by Alberto).


Here you can see the IWA aggregates inside the hopper.

This grand hopper is attached to a belt conveyor, that brings the IWA aggregates into a bin, to produce our ECON. It is mixed like a normal concrete, with water, cement and admixtures.



As you can see, the aggregates with a size diameter bigger than 25 mm are held on the hopper and must be removed by hand by the operator. This avoids too big aggregates to be mixed together with ECON.

So, this is the simple flow that we use to produce ECON and non-JIS concrete (JIS-gai CON).

Both of these recycled concretes are used as rubble concrete, levelling concrete, for parking lots, exterior works, etc.

By doing so we cut costs and help to keep a clean environment.

These aggregates can be sold also as they are, as backfilling material for road subbase, etc.

We became a zero emission RMC plant, without the production of any concrete waste.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Demostrations for concrete recycling


Demo demo demo demo!

We started to perform many demonstrations in different parts of Japan.

It is the easiest way to show and explain to customers and business partners how a system works.

We held a demonstration also yesterday.


This picture has been taken before the demo.

The demonstration was about the IWA System and Moreste (mortar less technology for concrete pumpin machines).

This time the leader was one of the most active members of the remaining/returned concrete forum, Mr. Nakamura of Kawabata Kogyo pumping machines (Fukui Prefecture).


In a very waterish remaining concrete has been added the RCZ powder.

After 7/8 minutes this was the result:


Perfectly granulated!

Recently we started to collaborate also with pump machine companies that are very interested in our IWA System to treat the concrete that remains in the small hopper of the machines.

Usually it is very disturbing and expensive for them to throw it away.

As we already said the places to throw away concrete are getting fewer and so the costs are increasing.

There is a grey zone in this case and not always the laws are respected.

This is one more reason to expand our IWA System for treating remaining/returned concrete in a legal and convenient way.


Mitsuya Miyamoto (translated by Alberto Ferrari)


We started to deliver our dry batched concrete that doesn't harden


We fixed the price at 3,500 yen per cubic meter.

We usually receive orders for dry batched concrete like at a sushi shop.

By dry batched concrete we mean a concrete without water.

It is used by the customer that wants to use a small batch of concrete by adding water directly at the jobsite.

Because of the surface water problem usually to finish a job with dry batched concrete it must take about 5 hours. After that it will harden.

This is why we started to deliver dry batched concrete that doesn't harden.

So the customer can decide to use it even after 10 hours or 1 month.

He has to add only cement and water once he's ready to use it.

This product is made by using our recycled IWA aggregates, produced by treating our remaining/returned concrete with the IWA System. So it contains both fine and coarse aggregates, without seaving.

It can be very useful especially for small jobsites. Just add cement and water and it's ready!

We fixed the price at 3,500 yen per cubic meter, hoping to make all our customers happy and satisified.

Dry batched concrete that doesn't harden... Roll out!


Mitsuya Miyamoto (translated by Alberto Ferrari)


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Also the FAX can be very useful to spread new info


Somebody may think that the FAX sytem is no more useful.

But we want to try also this solution, to spread the info related to our new technologies.

We started by sending by fax the news regarding our porous concrete to the exterior works companies.

Then we sent faxes about the remaining/returned concrete recycling system to the GNN memeber concrete plants.

At the moment there are 3406 RMC plants in Japan and soon or later we'd like to be able to reach all of them.

The fax we are sending includes these kind of info:

By our system you can cut extra work costs

Make it easier for the workers

Reduce noise and dust

Reduce and eliminate discharging costs

Reduce and eliminate the CO2 emissions

Recycle also the sludge

Then, as said before, we will host a seminar every Friday at our new plant in Izu Nagaoka 1407-34.

For any further info you can contact me (Mitsuya Miyamoto, +819017299893) or check our website: http://www.nr-mix.co.jp/econ/

I don't watch faxes anymore, but I know that some guys still prefer the fax communication to the internet/e-mails.

We must think about the best ways to reach all the involved persons and probably drivers and workers don't use Facebook or Messenger and are still used to read faxes.

We will continue to do our best to solve all the remaining concrete related problems in Japan.


Mitsuya Miyamoto (translated by Alberto Ferrari)


Really?? Just 2 small bags?? The IWA System


By getting in touch and meeting people it gets easier to know new things.

The other day a business partner came from Osaka to our plant to know more about our IWA System for remaining/returned concrete recycling and about GNN.



I thought that everybody knew our system in detail, after all these years and after the above videos had more than 5000 views.

There is still many people that doesn't know about it.

We must improve our communication skills even more.

Plus, the IWA System is always in movement, it changes and improves every day.

Before we had to use 7 bags to treat 1 m3 of remaining concrete. For 4 m3 21 bags!

Now only 2 bags are necessary.

Also, we changed the way to use it. Now we are using a pool, instead of the RMC trucks.

The IWA System improvements can be seen as the improvements made by our children. Everyday there is a small improvement.

At the moment we are also renewing or website and our marketing structure.

Web informations are useful, but probably not enough. So we organized some seminars, every week's Friday.

We want to show the "new IWA System" to all our business partners.

So please, come to visit us and spend some relaxing time in Izu Nagaoka!


Mitsuya Miyamoto (translated by Alberto Ferrari)

One more reason to visit the Izu Peninsula


Everybody has his own strong points. It happens often that we are not aware of our own strong points.

We can say the same about the places we are living in. For example,by living and working in Izu we can see Mount Fuji every morning, so we don't care that much about it, but for people that live in different places it is very impressive to see it once in a while.

We are surrounded by natural beauties:

At north Mount Fuji

At east Hakone and its famous and beautiful lake

At south Mount Amagi

At west the Suruga Bay

In the middle there is the Kanogawa River that goes from the Izu mountains to the sea.

As it is a volcanic area, we can enjoy the beautiful and relaxing onsen (Japanese Spa) every day after or before going to work.

Since many years ago we often host some demontrations and seminars for our business partners (General Contractors, RMC plants, pump machines companies, etc.), to show and explain them about our new technologies.

After a while I understood that people comes mostly to enjoy the beautiful onsen and delicious Izu food. They are more interested into these things than in our technical explanations.

This is why I realized that I was born and I'm still living in a very beutiful area. I feel lucky.

From now on we decided to fix a seminar (plus demonstrations) in Nagaoka every Friday.

After joining us in our plant our business partners can enjoy a relaxing afternoon and evening in this beautiful countryside.

For example after have seen our improved system for concrete recycling (IWA System), we can go to relax in a beautiful onsen and then go to drink together!



Mitsuya Miyamoto (translated by Alberto Ferrari)

Solution for pump machines remaining concrete


Today I came in Fukui to attend a demonstration held by Kawabata Kogyo's Mr. Nakamura (GNN member, president of Kawabata Kogyo pump machines company). The audience was composed by many pump machines companies and also people from the pump machines companies association.



New type of piping equipment. It is possible to see inside.


In the pump machine's hopper there is always some remaining concrete left. Now, with GNN and the IWA System it is possible to treat it and discharge it easily, producing new recycled IWA aggregates.

Please see the video in the links below:







We never had this idea before. Applying our IWA System to the pump machines remaining concrete!

Of course pump machine companies are facing the same problem that we RMC companies are facing, about remaining/returned concrete. And the General Contractors too.

There are many different cases, depending on the area, on the local pump machine company's management style, etc.

Next week we will bring these new info to our "remaning concrete technical forum".

GNN will keep proceeding in the direction of innovation and recycle and reuse, trying to give the best advices and solutions to all the involved parties (General Contractors, small and medium RMC enterprises, pump machine companies).


Mitsuya Miyamoto (translated by Alberto Ferrari)

Work together to find the best solutions


Yesterday evening I moved from Tokyo to Nagoya and now after a meeting in Nagoya I will move to Fukui, in the western part of Japan.


I took this picture while I was running this morning in Nagoya.

In these years I was always worried about my physical condition, also because I'm always travelling and it makes me very tired.

So I tried to change my habits. I started to run and swim and this made me feel better.

Also the RMC industry must change. Due to some positive companies and to GNN this is already happening.



These pictures have been taken at one of our customer's jobsite (Atelier Kazu).

It looks like a normal concrete, but it is our new product, Non-JIS concrete.

It is different also from our ECON, because we subsitute only about 30% of the natural aggregates with IWA aggregates.

Up to now we received many good feedbacks. It seems to be even better than our normal concrete...

The main problem with concrete recycling has always been finding good and lucrative ways to re-use the recycled material.

By using our IWA System we can re-use the obtained granular material as aggregates for new recycled concrete or as backfilling material for road subbase, etc.

To spread these info we are using also internet a lot.

Recently our staff members Ferrari and Endo visited also Menjo Kenzai's plant (GNN member and RCZ user), near Nagoya.




They have many small RMC jobsites like us and so they have a lot of remaining concrete to treat everyday.

So we faced the same problem.

For this reason they were able to use our IWA System and get big profits from it.

We will continue to work together with our GNN business partners and try to get the best solutions, helping one another.


Mitsuya Miyamoto (translated by Alberto Ferrari)

What will they think about us?



Yesterday I wrote a blog article about what will be the situation of the RMC plants in the near future, in the 22nd century.

What people that lived at the beginning of the 20th century would think  about the actual situation and about our globalized society? 

The need of a more sustainable society is becoming more and more evident and also the RMC Industry must reduce its waste and increase its recycling capacity.

Our staff members Ferrari and Endo visited Kimura Kenzai plant, in the crowded and very busy city of Nagoya.

A lot of big projects are going on down there and so everybody is lookinf for some good solutions to solve the concrete waste related problems.



Last month they bought the first pallet of Re-Con Zero Evo and now they are building a pit and all the necessary facilities to use it to treat their remaining and returned concrete.





As I already wrote before, recently we are receiving many inquiries about our products through our webpage. Kimura Kenzai and Taiyo Concrete are just two examples.

About our IWA System, people usually ask us what machineries and facilities are necessary, what will be the environmental problems, etc.

We can't answer the same to all the plants. Every plant is different and every environment is different.

The only points that all the plants have in common are the presence of remaining concrete and the possibility of recycling it.

By using Re-Con Zero Evo we can obtain a granular material that can be re-used to produce a new, recycled concrete (replacing the natural aggregates).





These are the recycled IWA aggregates at Kimura Kenzai plant.

Recently many users are selling them as RC aggregates, that are used as roadbed material.

So, not only to produce concrete, but also as they are. There are many different possibilities to reuse them.

With the help of all the GNN members that are involved in this project we are improving our system day by day, step by step.

Unfortunately the remaining concrete, concrete waste related problem cannot be solved in one day or just by one big company.

We must help each other and find the best solution all together.

For this reason we created the remaining/returned concrete solutions forum, inviting also general contractors and pump machine companies.

There are still 83 years to the 22nd century, but I like to think what will they think about us in the future.


Mitsuya Miyamoto (translated by Alberto Ferrari)

About the remaining concrete forum



By using the IWA System we obtain recycled aggregates, that can be reused to produce a new recycled concrete.

To produce concrete we need:





Aggregates and sand represent 2/3 of the total.

Now we are replacing them with IWA aggregates, in our recycled concrete.

So we pay these aggregates... 0 yen.

By doing so we just pay costs for the remaining 1/3, to produce our non-JIS concrete.

For example, if a company pays 2500 yen for sand, 2500 for gravel and 2500 for cement it should pay 7500 yen. But with our system the same company will spend just 2500 yen. Big saving!

It is not the only advantage.

The company can save time and money for letting the remaining concrete harden and then breaking it (creating a big noise and dust).


These are the main advantages for the company.

There must be advantages also for the customers (General Contractors, pump companies, etc.), to make everybody happy.

On April 14 we hold a meeting on our concrete recycling technologies in Tokyo, also to discuss with all the involved parties.

It has been one important step for the Japanese concrete waste recycling.

We'll continue to organize such meetings to discuss with our business partners.


Mitsuya Miyamoto (translated by Alberto Ferrari)


We need to be careful with the noise and our neighbours


I really like Nagoya's food and also Gaburi Chicken (a chain of restaurants).

And also, last but not least, Nagoya's RMC!

One of GNN members is the closest concrete plant  to Nagoya Station.

The name is Kimura Kenzai.



Even if the plant is inserted into an industrial area, it has homes all around.

For this reason they face many problems related to noise, dust and dirt.

This is a period in which people complain also about the voices of children coming from kindergarten and schools.

So they are facing a big trouble about how to treat their concrete waste without producing much noise and dirt.

This is why last month the President, Mr. Kimura, decided to enter GNN and be part of our IWA System.

Last week they already produced their first trial batch of IWA recycled concrete. They work very fast!



They're also creating a 20m3 pool to treat their remaining/returned concrete.



They already have a stock of IWA aggregates.

Because of their speed they remember me a lot of Shiraishi Concrete, the Okayama plant that became part of our IWA project and helped us a lot with their ideas and trials.

Also this time Ferrari and Endo moved to Nagoya to help Kimura Kenzai to start with the IWA System.

Mr. Kimura in the near future would also like to help the whole project to move forward with new suggestions and new ideas.

As they are already using fly ashes in their concrete they are planning to use them also in their IWA recycled concrete.


It is for the first time, so we are also very interested into it.

Also this time a Nagoya plant gave us a big help.

We will continue to find new solutions for our remaining/returned concrete, together with our loyal GNN partners.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Ferrari & Endo


Ferrari and Endo.

This is our staff in charge of our remaining/returned concrete project.

Recently we are receiving many inquiries about it also through the internet.

There are many different ways to treat remaining concrete in Japan.

And there are also different ways to use our IWA System.

So it cannot be explained just with a phone call.

It is necessary to visit the concrete plant and see the real condition of their concrete and facilities.

In the last weeks we received important inquiries from Iwano Kogyo (Mie Prefecture), Taiyo Concrete (Hamamatsu) and Kimura Kenzai (Aichi Prefecture).

So we sent our staff there to help and explain how to begin with the system.






Both Ferrari and Endo are working on this project since about 7 years ago.

At that time we faced many problems about our concrete waste.

At the beginning it was not easy to introduce and adapt to this new system, but now, after 7 years we can say that we don't have any concrete waste (zero CO2 emissions) and we don't spend any money to discharge it.

Of course this was possible with the help of Mapei and GNN.

From now on we'll do our best to continue to help this Country to get rid of its remaining/returned concrete waste.

To do this Ferrari and Endo will continue to travel around Japan to help our partners.


Mitsuya Miyamoto (translated by Alberto Ferrari)


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Love at first sight is important


I usually don't stay awake until 23:30 to write my blog.

Usually I'm somewhere drinking, like I did yesterday.

Tonight I was thinking back about how we started this project.

We started through WA21, the product that Mr. Yamashita of Remic Maruhachi introduced to me some years ago.

It is a powder that if introduced into the truck mixer and mixed at 15~18rpm speed, absorb the water contained in the concrete and generates a granular material, within 5~10 minutes.

The first time I saw this process I felt love at first sight.

Now we made many changes.

Of course the product, but also the way to mix:


Now the remaining concrete that comes back to the plant is immediately discharged into a pool and then 1 or 2 times a day we proceed to do the process shown in the above YouTube link.

So we don't keep any truck busy and we can also check and adjust the concrete slump to avoid complications during the IWA process.

By the way we still have some customers that prefer to use the mixing drum and so we made a video also for them:


Recently we have been contacted by Mr. Kondo of Taiyo Concrete, a RMC plant based in Hamamatsu (Shizuoka Prefecture).

He thought that he could use one of their old trucks, that are not used to deliver concrete anymore, to collect the remaining concrete and perform the IWA System.

Then, as you'll see in one of the next posts, they decided to use the pool method.

By the way, this remaining concrete related project is very interesting, as we can discuss with a lot of people, trying to find the best solutions.

We will keep going with this project, as it will become more and more an important matter all across the Country.


Mitsuya Miyamoto (translated by Alberto Ferrari)

One more reason to visit Izu


There are many reasons to visit Izu:

The Kawazu sakura

The onsen (Japanese SPA)

The beautiful nature

And now, also to learn how to treat concrete related waste.

Today the President of Kimura Kenzai (concrete producer, GNN member) came from the Aichi Prefecture for the above reason.

Last year they planned to renew their plant and so now they are looking for many new solutions.

They used to treat their returned/remaining concrete by the normal washing process.

This process has been the same for the last 30 years and one of the final results, the sludge cakes, is not recyclable and takes a lot of money to be disposed.

Mr. Kimura found our IWA System solution on the internet and then contacted us to know more about it,

On the top you can see him and our staff reunited during the so called IWA meeting.

By just putting 2 bags of Re-Con Zero powder, in about 5~10 minutes, we can treat 1 or even 2 m3 of concrete, depending on the consistence and condition of the remaining concrete.

Considering the cost of the powder and the fact that the obtained recycled material can be used as aggregates for a new recycled concrete, he was impressed by the amount of money that he could save by starting to use our IWA System.

As they are a small-medium plant like us, they have a lot of small jobsites where they can deliver a recycled non-JIS concrete.

As now we are offering to our customers 2 different types of recycled concrete (with 100% or 30% substitution of natural aggregates), we suggested him to do the same.


GNN goal is, as always, to help all the Japanese RMC plants to get rid of their remaining concrete and sludge waste. 

To do this, everybody's help is necessary!


Mitsuya Miyamoto (translated by Alberto Ferrari)

By doing mistakes we learn how to improve

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We'll always thank our loyal customers.

Since many years ago we are doing an inspection before and during every jobsite where we deliver concrete.

Recently Mrs. Yamaguchi is doing this job.

Before she was a RMC truck driver and so she knows very well how things go at the jobsite.

Everyday she collects info and hears what the customers have to say. Then we always try our best to improve according to the mistakes we did.

We call our customer's voice the "angel's voice". This is how much we respect them.

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This picture shows something we had to apologize for.

As you can see a piece of plastic is coming out from the levelling concrete.

Re-Con Zero powder, the product that we're using to treat our remaining concrete and sludge, is contained in water soluble plastic bags.

Here in Japan we invented a new method to use this product. Not inside the truck mixer, but into a pool. So sometimes if the remaining concrete is not perfectly mixed with the powder some pieces of plastic bags remain there. Once they fall into the new recycled concrete this is the result.


Now to treat 1m3 of remaining concrete 2 bags are necessary. By doing this we can transform 1m3 of remaining concrete into 2.3 tons of recycled aggregates.

Recently, for the reason above, before putting the product into the pull we cut open the bags and pour the powder in a void RCZ EVO plastic container. Then we pour the product from there into the pool.

We learned something new, thanks to our customers. Now we know how to avoid the same mistake.


Mitsuya Miyamoto (translated by Alberto Ferrari)


We started a new type of recycled concrete: "Non-JIS concrete"


It is a word typical of the RMC/Construction vocabulary, so many people don't know it. Non-JIS.

It refers to products that cannot have the JIS mark.

JIS concrete must comply to the JIS A 5308.

But there are also regulations about non-JIS concrete.

Until now we just had ECON, made by 100% subsitution of natural aggregates, sand and cement with IWA recycled aggregates and sand and eco cement.

Of course we are still selling and promoting it as we have many loyal customers that buy it daily. It is cheap and especially in winter has a good workability.

It happened sometimes that some customers were not fully satisfied by ECON, anyway.

So we thought that we could have put on the market another recyled concrete, not 100% made by recycled materials, but with a lower percentage.

Even if they don't have the JIS mark they must have good workability and finishability, good strength and durability and of course, must be cheap.

We started to sell it from the 1st of March and already sold it to many customers.

Of course our final goal would be to promote some changes to the old and strict rules that regulates the concrete industry in Japan, but unfortunately it is too early. We must proceed step by step.

The 2020 Olympics might give us a help in this direction, as changes are needed quickly, to follow up the jobsites and be ready for such a big event.


Mitsuya Miyamoto (translated by Alberto Ferrari)

The HOLCIM challenge


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Holcim is competing with Lafarge for the world's leadership about cement.

In Japan the leader is Taiheiyo Cement.

At the moment, Holcim is thinking about the best way to use Re-Con Zero in their plants. Yes, the same Re-Con Zero we're using and distributing in Japan.

So we can say that also in other countries they are worried about remaining concrete and sludge.

It is very important for us to collect such info and bring them back to Japan.

We are also proud in a certain way to be in possess of the solution for this kind of problem.

In Japan we are working especially with small-medium companies, GNN members, but we can see that also big companies as Holcim are facing the same problems.

Our collaboration with Mapei started 8 years ago, when they came to visit us in Nagaoka.

Since then we made a lot of steps forward, together with other small-medium enterprises like us. If we can progress and find new solutions we can also help big companies like Mapei or Holcim to improve.

Holcim now has started to try to solve their problem regarding remaining concrete and sludge.

We have been dealing with it for the last 7 years, so we could also give our help to them.


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Giorgio Ferrari, senior researcher at Mapei in Milan


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The IWA/RCZ aggregates produced by a Holcim plant in Italy

They have just started their project, but we are sure that we can help each other in a positive way and be able to solve or at least reduce the remaining concrete/sludge problem all around the world.

We can do it only by supporting each other, no matter how big or small we are.


Mitsuya Miyamoto (translated by Alberto Ferrari)

What can I do for you?

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What can I do for you?

This is what Mapei's staff asked us when we started our collaboration.

It really impressed me.

It is a very different style compared to the usual.

What can I do for you? What do you need?

As the Japanese market has a fixed, vertical structure we are not used to being asked such questions, nor answer them. We are not used to think about what we need.

As a RMC factory usually we are just told what to do by our customers or even by our dealers.

Japanese RMC factories just mix and deliver concrete, nothing else.

We were not ready to be asked if we need anything.

Our partnership with Mapei started in this way. We asked for a solution to a problem and they gave it to us.

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This is one section of Mapei's laboratories in Milan.

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The meeting this time was focused on Re-Con Zero. In the picture Alberto Brocchi, one of the Mapei guys involved in this project.

One news is about one Taiwanese customer of Mapei, that needs a different kind of packaging.

They asked for 25 kg. bags, instead of the small water soluble ones that Mapei is offering now.

Another topic was about an admixture that can be used at the jobsite, to adjust the recycled concrete slump, according to the customer needs.

It must be cheap, as it is used into a non-JIS concrete and it should reduce the slump loss in summertime.

I'd like to end this post by saying that to know what we need we should know what we want to do and what direction we want to take. On our job and in our life.


Mitsuya Miyamoto (translated by Alberto Ferrari)


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Far from the Italian hometown

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I think that there are two types of businesses.

Production job


Administrative task.

Everybody has different strong points and may prefer one type of job or another.

In our company we are trying to get the best from every member of our staff.

We are actually following this flow:

Do something.

Then collect the info and prepare a brief explanation about it.

Write down a feedback, all the collected informations in an easily understandable way.

To do this we are using our website and all the SNS resources (Line, Messenger, etc.).

Every member of the staff must write on Messenger his/her tasks and everything that may concern his/her everyday's work.

So everybody is informed about everything and might help if necessary.

By using internet we are also getting a lot of contacts and visits from new customers.


9,492 sessions

6,099 users

17,689 page views

We started one year ago and we got already these big numbers.

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As you know we are actually collaborating with Mapei S.p.A., one of the world's leaders for what concerns concrete admixtures.

We are using their admixture to transform remaining concrete waste into new recycled aggregates. Then we produce new recycled concrete from those.

The pictures above show some examples of that recycled concrete.

The person in charge is Alberto Ferrari.

He came to Japan from Italy about 7 years ago and so we started our IWA project.

Every year in this period we go to visit Mapei in Milan, to discuss about our collaborations.


Now by using Re-Con Zero EVO only 2 bags are necessary to treat 1m3 of remaining concrete.

Our goal is to transform every m3 of remaining concrete and sludge waste into a resource.

To do this we will use of course every solution available, especially on the internet.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Iwano Kogyo, IWA no Kogyo!


I often say it, but it is definitely true: it is not easy to solve the problem of remaining concrete.

Every RMC plant knows it and every RMC plant is struggling because of it.

So, not only Nagaoka RMC, but every concrete factory is putting a lot of time and efforts to find the best solution.

GNN is trying to help every Japanese plant to do it.

Today our team of experts in this matter, Endo and Ferrari, has visited Iwano Kogyo plant, located in Mie Prefecture.

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By the way, Iwano Kogyo is similar to IWA no Kogyo, which means "The IWA factory".

They have a huge amount of concrete sludge and they are trying to find a solution to reduce it.

So they started the IWA project.

As you already know, we started this project more than 6 years ago and we are still learning from our mistakes and improve the system every day.

One good point of GNN is that if one member makes a mistake all the other members can learn from it and avoid to make the same mistake.

GNN members help one another.

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So, also Iwano Kogyo joined our group and our IWA project.

Of course, this blog, some pictures and videos can help, but it is extremely important to see the real condition, with our own eyes.

We can solve the remaining problem all together.

It is not easy.

If it was easy, all the Japanese concrete factories would have already solved it.

We, Nagaoka Ready Mixed Concrete, will help every company that is interested into it.

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Iwano Kogyo has a lot of remaining concrete and sludge to deal with, everyday.

They seem ready to start to produce also recycled concrete (non-JIS) very soon.

Today we went there to teach them some hints, but probably from tomorrow they can teach somebody else too.

Our dream is to solve the remaining concrete problem in Japan!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Visiting another "out plant"- Sludge, remaining concrete

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Today I came to visit a concrete plant in Yokkaichi City, Mie Prefecture.

It is cold here.

The factory is called Iwano Kogyo and recently became a GNN member.

The company is runned by brothers, who are very close to each other.

In one of my previous posts I wrote about the possibility to transform a mountain of sludge into a mountain of treasure. This is why they decided to contact us and enter GNN.

They were very surprised about how we can produce recycled aggregates from remaining concrete and sludge.

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So, as you can see in the above picture, they decided to buy one pallet of RCZ EVO.

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This is how they are sieving their sludges.

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Now they discharge the remaining concrete into the pool.

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And put over it the sludges.

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Add the RCZ EVO powder and mix with an excavator, like you can see in the below video.


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Then the obtained material is mixed with the previously produced recycled aggregates.

By doing this the recycled aggregates can be re-used to produce some new recycled non-JIS concrete. This allows to reduce little by little the sludge mountain.

The sludge mountain will be then completely removed, allowing to use the obtained free space.

These are some of the most important merits that come by using RCZ EVO.

Even if the remianing concrete is very liquid, like water, it can be treated, by blending it with some sludge, reducing the slump.

In this case the sludge are very useful.

So, concrete waste are reduced and some recycled aggregates are obtained, reducing the costs for new aggregates.

Iwano Kogyo is an "out plant", not member of any concrete association.

At the moment, the IWA/RCZ users are mostly out plants.

This is due maybe to their better capacity of taking decisions without the need to inform any association. They are more indipendent.

We as NR are part of our local concrete association, but I thank everyday these out plants, that are helping us in our project.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Happy 80th birthday to our business partner MAPEI!


It is not easy to keep a business going and grow for 80 years.

A company is different from a human. It doesn't make difference if it has 80, 100 or 1000 years.

If it is well managed.

If not it could be hard to keep a company alive also for just 10 years.

It is also important to say that Mapei is a family company, founded 80 years ago by Mr. Rodolfo Squinzi, followed then by his son Giorgio and Giorgio's sons.

In my working experience the partnership with Mapei is one of the most important events that ever happened.

It is the third biggest concrete admixtures producer in the world.

We are just a small company based in the Japanese countryside.

A company can survive and improve only if the staff is happy and the management does the right choices.

This year we also celebrate our anniversary. Our 50th anniversary.

I became President, as my mother retired this year.

So also my responsibilities grew.

Talking about innovations, also today I came to Okayama City, to visit Shiraishi Kensetsu and see how the IWA/Re Con Zero EVO project is going.



This is the product that is helping and will help also in the future to reduce world's concrete waste.

We as NR and GNN will give our help and support for this project.

Thanks for everything Mapei and again, happy anniversary!


Mitsuya Miyamoto (translated by Alberto Ferrari)


"Some remaining concrete left? Use it like this!" Concrete recycling and house makers

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The problem of remaining/unused concrete has always been a trouble for the RMC companies all around Japan and in every other Country.

Every Country has its own rules and regulations about it and about how to recycle it.

Not only the RMC factories, but also the house makers are facing this trouble.

Usually they order an amount of concrete bigger than the needed amount, to be sure not to run out of concrete, especially in the last batch.

And this is one of the main reasons of the remaining concrete.

Today we went to visit a jobsite, where they were pumping the concrete and we showed them how to recycle 1m3 of remaining concrete left, directly at the jobsite.

Of course we introduced them the System developed by Mapei and GNN.

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Just 2 water soluble plastic bags to treat 1m3 of remaining concrete.

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At the end, we had about 1,5m3 of remaining concrete in the pump machine hopper.

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So, the powder was inserted into the truck.

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And this is the final result.

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Then the placement of the obtained recycled aggregates started.

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After about 30 minutes we got this result.

By this method we can obtain a cut in the costs of concrete recycling and of aggregates.

We, as RMC factory, are working on this method to solve the remaining concrete problem.

But this problem affects not only the RMC plants, but also the builders, house makers and pump machines companies.

So we must find a way to develop the best system possible for all these partners.

In the near future we wish to see more examples like this, where the remaining concrete is recycled and re-used directly at the jobsite.


Mitsuya Miyamoto (translated by Alberto Ferrari)


Videos about remaining concrete treatment and recycle


I said it also about our porous concrete: by showing some videos it is easier and faster to explain something.

Everybody can understand, just by watching.

So now I would like to introduce some videos about our system for remaining concrete recycling.


At the moment 15 GNN members are involved in the development and research about the IWA/Re-Con Zero System.


The above video is about the method suggested by Okayama's Shiraishi Kensetsu.

Just discharge the remaining concrete in a pool and then treat it with the RCZ powder at the end of the day (2 times in summertime).

This method allows to avoid the waste of time that we faced in case of putting the powder inside the truck.


The next video was taken at Ozaki Concrete, in Kakegawa (Shizuoka Prefecture).

As they don't have an excavator, they decided to use a loader, obtaining some very good results.

This is the original video made by Mapei:


Since the beginning of our project we are working together with Mapei, to find some good and innovative solutions for the Japanese market.

Please don't hesitate to contact us if you're interested in coming to visit Mapei plant and facilities in Milan (Italy).


This is a brief explanation about how they are dealing with the remaining concrete in Yamagata's Mitsuwa Concrete.

If you have some more questions please don't hesitate to contact me at +819017299893 or my colleague Alberto Ferrari at +819017299891.


Mitsuya Miyamoto (translated by Alberto Ferrari)

"The jobsite is finished, but we have 3 trucks to discharge"- The remaining concrete problem

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Today 3 guests came to visit our plant in Izu Nagaoka.

They came from Shimane and Gunma Prefecture.

Motoki Kenzai, from Gunma, is a GNN member from the beginning, but until now we hadn't the chance to meet each other many times.

Mr. Nakane was very interested in watching a demonstration of our system to recycle remaining concrete.

This made me remind of something that happened about 15 years ago, when the remaining concrete problem was still without a real solution.

In the evening, at the end of a working day, we had 3 trucks full of remaining concrete, to discharge.

This meant a lot of extra work (and extra salaries to pay).

About 12,75 m3 of still fresh and re-usable concrete to dispose. A real shame and waste of good materials.

The only thing that we could think at the time was: "if we could re-use it tomorrow it would be perfect".

And so we used to produce some concrete blocks or we had to discharge it on the ground and break it with a drill the day after, generating a lot  of noise and dust. This of course took some of our free time, that we could have spent with our families and children instead.

So, a waste of money, time and materials.

Also Motoki Kenzai is facing the same problem and so they are looking for a solution and for this reason Mr. Nakane took a day off his regular work to come to Nagaoka to visit us.

So, we must give him the solution, or at least some good advices.

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For this reason I made an explanation about our IWA System for concrete recycling.

We cannot say that's perfect yet, but in the last 6-7 years we (together with GNN and Mapei), made a lot of progress to make the system as good (and easy to use) as possible.

We are really honoured to receive visitors from other cities and prefecture and we will continue to do our best to make the life of every worker and RMC company easier.


Mitsuya Miyamoto (translated by Alberto Ferrari)



The sludge problem in Japan- The Kobe case (Taikei RMC)


I usually like to visit RMC plants around the Country.

As I was always involved in this Industry, I feel at home when I step into a concrete factory.

The same happened when I visited Taikei RMC, in Kobe, West Japan.

As you can see they have a big amount, a mountain of sludge.


It is a case that we can find in almost every Japanese plant. (We talked about this in one of the previous posts).

Remaining concrete and sludge are something that must be treated and transformed into a resource.

We have many good examples of successful stories, like the case of Yamagata's Mitsuwa RMC and its recycled concrete called Nekon. They were able to transform their sludge mountain into a good resource, in about 1 year.


So, also at Taikei RMC they want to follow these examples and move forward, to create the same successful story.

Think positive and move forward.

The two most important points.

The next moves include organizing a seminar for the local RMC buyers and proceed to remove the sludge mountain from the plant in about 1 year.

But changes are not easy, for anyone, me either.

GNN will help anyone to solve their problems and in this case, to remove the sludge mountains from the concrete plants.

Let's move forward together then, positively!


Mitsuya Miyamoto (translated by Alberto Ferrari)


Our manual to treat remaining concrete



Our system to treat remaining concrete is called IWA System.

Today I went to run 6km at Ueno Park, then went to Narita City to play golf and I walked a lot there too.

If someone asks me to do it again for 10 times I would say "no, impossible".

But if it is a movie I can watch it 10 times. 

I can watch a movie many times without being tired, but I will get tired after many seminars.

This is what we want to use internet for. To make our work easier and get the same or better results.

For these reasons I and our staff made this video manual about our IWA System to treat remaining concrete.

People in this business field, not only in Japan, want to know how to solve this problem.


The video above refers to the treatment of remaining concrete.

It comes back from many different small jobsites.

We will have a lot more remaining concrete from 100 jobsites of 1m3 each than from 1 big jobsite of 100m3.

We are collecting and treating it in a pool.


The above video shows how the obtained recycled material is handled. For example, it is better to mix it with previously made IWA aggregates to avoid it to compact together.


Then the aggregates must be sieved, to avoid too big pieces to enter the concrete mix.

This could become a problem especially in case of a concrete placed by pump machine.

So, by following carefully the instructions contained in the three videos above, we can solve the problem related to remaining concrete and create a new recycled concrete.

Please feel free to contact us for more detailed info.


Mitsuya Miyamoto (translated by Alberto Ferrari)

It is not scary anymore. Tax office, police, health center, etc.


Does anyone feel tense when you see the police station?

For any type of business, for any society there are rules.

Sometimes we might fail and not be able to follow them perfectly.

Sometimes we feel the pressure from the authorities that make us follow them.

But we must be thankful, because is thanks to them that we are able to live in this society.

I wrote also yesterday about the sludge mountains that are present in any RMC plant.



I already wrote that I'd like to remove them from the RMC plants and make them become not scary anymore.

There are two ways to make something not scary anymore:

Become so much scary that nothing won't be scary anymore

Succeed into solving the problem as it won't be scary anymore

I prefer the second way.

So I'd like to transform the sludge/waste mountain into a resource/treasure mountain.

Sludge can be recycled in many ways, for example to make admixtures, aggregates, paper, flue-gas treatment agents, etc.




So many technologies are progressing forward.

We'd like to be able, through GNN, to expand these innovative technologies and let them be known all over Japan.

This is one of our challenge.

Mitsuya Miyamoto (translated by Alberto Ferrari)

A mountain of sludge--->A mountain of treasure


It is something unknown to the most, but in every RMC company you can see a mountain of sludge.

Sludge should be treated and disposed in special ways and places, but as the landfill are becoming fewer and price are getting higher, it is becoming a probleme here in Japan.

Today I came in Yokkaichi, Mie Prefecture, to visit Iwano Kogyo plant.

They decided to treat their sludge in this way:

mix about 20% of it with remaining concrete coming back from the jobsites

mix in the IWA/Re-Con Zero powder

produce non-JIS concrete from it


The sludge are taken from the sludge mountain.


This is the image of the hopper after the sludge are inserted in.


Then the Re-Con Zero/IWA powder is mixed together (2 bags for 1m3 of concrete).

About 0,8 m3 of remaining concrete and 0,2 m3 of sludge are mixed together.



This is what was obtained in 3~5 minutes.

A lot of recycled aggregates, from something that was just a problem for the RMC plant.

To be able to use them to produce a new recycled (non JIS) concrete it is necessary to ensure the right slump and strength.

The jobsites in which it can be used are:


levelling concrete

rubble concrete

So, the waste mountain became a mountain of resources.

With the help of GNN this project started 6 years ago evolved and will continue to expand.

We will tranform every plant's sludge/waste mountain into a treasure mountain.

We'd like that in the next ten years our system to recycle and reuse concrete waste will become normal for everyone.

So, sludge are no more a waste, but a resource.

Recycling is possible.

Mitsuya Miyamoto (translated by Alberto Ferrari)




This is for the people that's really worried


As every human being has his own personality, also the products have their own.

For example, the IWA System for concrete recycling has its own personality. It goes along well with certain type of plants:

with many small jobsites to serve per day

with many Non-JIS jobsites

out of the local concrete associations

specialized companies

So, the IWA/Re-Con Zero powder (Mapei product) fits very well with these type of companies.

Now we are also doing an extensive marketing operation by using internet, but in this case it is necessary also a supplementary explanation.


This is a simple user manual:

insert the powder (2 plastic bags for 1m3 of remaining concrete) into the truck or in a pool

let it absorb the water (by mixing for 3~5 minutes)

stock the obtained aggregates

re-use them as recycled aggregates for non-JIS concrete

Sometimes we had some complaints about the fast shrinkage of recycled concrete in summertime or the presence of too big aggregates (over 40mm of diameter), but in any case the merit (money and labor costs savings) are way bigger than the demerits).

Now there are 3406 RMC plants in Japan.

How many of them are really worring about concrete waste?

Do they know about the IWA System for concrete and sludge recycling?

Though GNN I've had the privilege to meet many positive and open minded plants in the recent years.

And they all had the same characteristics:

many small jobsites to deal with

many non-JIS jobsites

not part of the local associations

specialized companies

We will continue to target these type of plants, to expand the knowledge about the IWA System.

To do this of course also the internet marketing is important.


Mitsuya Miyamoto (translated by Alberto Ferrari)


This is the poster of 2016 GNN Conference in Tokyo:

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The chronic pain brought by remaining concrete: chronic lost profits


The symptoms can be acute or chronic.

Acute: strained back, neck twist while sleeping, bruise, sprained ankle, muscle rupture, fracture.

Chronic: sciatica, hernia, frozen shoulder, knee pain, hip pain, menstrual pain, visceral disease.

We can find the same differences talking about products.

For example, concrete repair.

There can be acute or chronic symptoms.

It is a big trouble when something happens to the bare concrete wall surface.

And of course the customer pretends that the trouble would be solved immediately.

The problem of remaining concrete is chronic.

It happens everyday.

Remaining concrete comes back to the plant. It is let hardened and then broken the day after.

After that is must be carried to the disposal place, meaning a cost for the company.

If we produce concrete we produce also waste (remaining concrete).

Everyday we have to spend money for the disposal and we have to pay our staff to do a work that doesn't bring any merit to the company.

As it is a chronic "pain" we get used to it and don't think so much about it.

Even if every month we have to pay money because of it we don't mind. We just keep on being hurt.

But soon or later a chronic pain, if not treated, will kill us.

So we must think about it and do something.

This is why we created a group in GNN to find the perfect solution.

It should solve many problems at the same time, related to:



surplus work

We have a solution called IWA System and we hope to be able to spread it thru the Country before the chronic problem will become uncurable.


Mitsuya Miyamoto (translated by Alberto Ferrari)

"Kimi no nawa, Your name"- Reduction of communication costs


When I used the title "The end of SMAP" to name one of my posts I had many more views than ever.

I also had many views when I named a post "Have you seen the new Godzilla?".

Recently the movie "Kimi no nawa, Your name" is very popular.

There is just a problem by doing this to attract readers.

People will get tired of it.

So I will obtain the opposite result that I tried to get.

Even if I name my post "Kimi no nawa" or "New Godzilla", the content must be related to RMC.

The word that people use the most in their own life is their name.

My name is Mitsuya Miyamoto.

I've always been interested about what people around me would have thought about me.

It is very important to try to reach the best performance everyday.

We also use to give name to things.

Personal computer




It is important to have a good sense to find good names for things.

Which I don't usually have.

People often tell me that.

This is somewhat a big obstacle for me.

But as I try always to be very positive I see this as a challenge for me, to improve.

Recently we switched our marketing style into a more technological one, with the help of internet.

We've seen that the term "IWA" is not easy to understand.

It refers to our system for concrete recycling and it stands for "improved water absorption".

IWA unfortunately cannot explain the system it refers to without an explanation. And this is not a good point in terms of naming.

We have many names for our products:7

IWA/ECON, for our concrete recycling system

DRYTECH for permeable concrete pavements

RC Total Support, for our bare concrete walls treatment

My RMC for the own made concrete

Sokunama for the fast setting concrete

Sujinama for the mesh concrete

Cell drone for the instant hardening of mud

After a brief explanation about their functions everybody can understand their use.

From now on I will continue to try to use the most understandable words as possible.



Mitsuya Miyamoto (translated by Alberto Ferrari)


"Digging into the remaining concrete problem"- To the guy that holds the hammer they all look like nails


By being in this industry for too long, people tend gto become myopic.

The experts always think with the experts point of view.

"To the guy that holds the hammer they all look like nails".

So, the doctor will have a medical point of view.

The teacher will have the educational point of view.

The concrete expert will have the concrete expert point of view.

Of course experience is important, but it is also important to be open to some new experiences and way of thinking.

The case of RMC is particular.

Usually, we get an order from a customer (of xx m3 for the xx day).

Then the concrete is delivered.

The load is not completely used at the jobsite and 1m3 is left in the truck.

People that don't know the RMC world would think that the remaining concrete will be disposed/treated by the customer.

But it is not so. The construction company order the RMC company to bring the remaining concrete back to the plant.

So the plant will have to think about the best and cheapest way to dispose the waste.

In big cities and metropolitan areas usually the waste is brought from the jobsite to a very far landfill. Because of heavy morning traffic the empty truck will be back at the plant at about noon (hopefully). So half day will be lost for nothing.

In this way one truck will serve just one jobsite per day. It's a waste of time and money.

Maybe this happens only in Japan.

In these 16 years working in the RMC field I think the matter related to remaining concrete is one of the most interesting.

With the help of GNN my goal is to solve this strange situation and all the problems that a RMC plant may face.


Mitsuya Miyamoto (translated by Alberto Ferrari)

The ranking of people worried about remaining concrete: house makers in the first place



Recently I understood that the firts place should be taken be house makers.

There are three different categories of companies worried about remaining concrete:

general contractors

RMC plants

and house makers

There are many times in life when you feel worried and have a lot of tension about something:

the first date with a girl

the first day of school

the first day in a new company

The same thing happens about remaining concrete.

Everyday people worry about it.

Everyday we try to find a solution to this problem, that costs every year a lot of money.

But most of the times people end continuing to dispose it at high costs, unable to find a decent solution.

"The boiling frog" is the perfect word to describe.

It is difficult to start a new challenge or adopt a new solution, even if we are sure that's a good one.

Going back to the categories worried about remaining concrete, we can say that general contractors are the less worried ones.

They usually order and place hundreds of m3 per day.

And so the remaing concrete is could be only the last truck of the day. A small amount.

As said before, house makers are the most worried. 4 times more than RMC plants and 200 times more than GCs.

Also this time we learned something new about remaining concrete.


Mitsuya Miyamoto (translated by Alberto Ferrari)

About the infantile circulation of remaining concrete


When I was a child and for some reason I broke a promise I was told "why did you do that even if you promised you won't??".

And I replied "when did I made that promise? What day, what month, at what time?".

I'm surprised when I see that also some adults have the same childish attitude.

We call remaining concrete the RMC waste.

It is the RMC that is not used at the jobsite and comes back to the plant to be disposed. The related problems are getting bigger and bigger.

6 years ago, with the GNN group, we started to investigate and try to solve this problem and now we are trying to evaluate what is the situation in the Tokyo/Yokohama area.

Also this time we learned many things.

As remaining concrete is part of something that the customer bought, it should be something that the customer should handle.

But at the end of the day, the RMC company must bring it back at the plant and find a way to dispose it.

In the Kanto area the RMC factories get paid to do that.

Anyway to do so the companies should have a particular type of license.

To avoid these problems some of them get a cancellation fee from the user.

But in some cases they get in trouble with the local concrete associations.

It is really a childish debate between adults.

There are still many companies that don't want to look like some elementary school students and try to behave like adults.

Remaining concrete is a waste.

And we have the solution. Instead of bringing the remaining concrete from the jobsite to a far away place to dispose it, it can be treated directly at the jobsite and the obtained recycled aggregates can be used there as filling material.

Today we got some good responses from other RMC plants.

Me and our staff member Alberto Ferrari are working since 6 years ago to fulfill a dream: eliminate concrete waste from the Japanese RMC plants. And we'll continue to work for that.


Mitsuya Miyamoto (translated by Alberto Ferrari)


"I don't want to read a manual". Remaining concrete treatment/videos/Menjo Kenzai


I don't like to read manuals when I buy something new.

When I get a new computer or machinery, I leave the manual inside and try to do by myself.

How many of you do the same?

I am the type of person that thinks "I will learn by doing".

Recently we are thinking about making a manual also in our company.

The goal is to make every member of our staff able to do anything it might be required to be done.

This is called job rotation.

And so we had the idea to make some videos or video manuals.

Then we post the videos on our YouTube account, so everybody can see it.

The main reason is because especially young people don't want to read manuals, but they are more willing to see videos.

Sorry for the long introduction.

So, remaining concrete and sludge represent a big problem for any RMC factory.

Every company has these kind of waste and everybody knows that the disposal costs are getting higher and that something has to be done.

But the RMC business is strange.

Even if people know this, they don't want to start something new. It becomes a very long process.

For example we can take the example of the IWA System:

People become awared of IWA from newspaper or other platforms.

They try to learn something more.

Then they hear about GNN and some GNN plants.

They learn that Nagaoka RMC is doing it.

This may take some weeks.

Then they might decide to call us.

They get a brief explanation from Mitsuya Miyamoto.

They decide to meet us, after one month.

And then, after this long process, they might decide to go on disposing the waste as usual, without trying the new system.

For these RMC plants it would be way more usefuland faster  to see a video.

Today I went to visit Menjo Kenzai and I got the chance to meet two guys from another company, Iwano Kogyo.

I took a video to hear their opinion about the IWA System:



Mitsuya Miyamoto (translated by Alberto Ferrari)


A business opportunity for house makers


Recently I've been visiting many house maker companies to promote our solution to recycle remaining concrete.

There are many differences depending on different areas and different local concrete associations.

In some areas a fee is required to dispose it, in others not.

Recently, with many big projects coming (linea, Olympic games, shin Tomei highway), this problem is becoming bigger and bigger.

The waste related to construction jobsites are increasing and also the cost to dispose them (as the land used for the disposal are becoming fewer).

As these are costs pending also on the construction companies and house makers, I thought it could have been a good idea to propose them our IWA System.

By using it, they could get many recycled aggregates at the jobsite for a cheap price. They can be used to fill the ground.

In these years we saw that the price of gasoline, the cost for concrete production and disposal are going up and our turnover is getting lower.

For this reason we all together must do somenthing and maybe now is really the time for RMC factories to get to the next level. 2020 is getting closer.

We should bring some happiness to ourselves and to the people around us, just like Anpanman does everyday in our dreams.

We must eliminate the remaining concrete problem.

This is on of the most important thema for RMC factories.

Mitsuya Miyamoto (translated by Alberto Ferrari)


The business which is the reproduction of the beauty of nature: Lohas RMC


Believe it or not, concrete is a reproduction of the beauty of nature.

Cement comes from limestone.

Aggregates come from mountains and rocks.

Concrete is essential for the life of all of us, as it is used to build roads, bridges, buildings, etc.

For this reason we cannot stop producing it and using it, but we can make more efforts to make it nature and environment friendly.

We can easily calcuolate the load on nature represented by concrete:

production of cement: by burning limestone at 1800 degrees we produce CO2.

collection of aggregates: by digging mountains and bringing them to the concrete plants by trucks we again generate an impact on nature.

Sustainability means being able to reduce these two factors' impact on the environment.

Recently a new technology is becoming slowly popular, geopolymers.

It allows to produce concrete without using cement.

The most known example is represented by fly ash, which collected at waste treatment and electric plants, can be used to replace totally or partially cement.

So waste can be used with or instead cement.

The aggregates can be substituted also, by slags.

There are many types of slags, depending on which production they are coming from:

iron and steel



electric arc furnace oxidation

These new technolgies are becoming well known to the people involved in this industry.

Now the goal is to make many concrete plants convinced of using these recycled materials on daily basis.

There are also many other sustainable new technologies, for an efficient recycle and reuse of returned/remaining concrete and sludge.

Now in our plant, we are producing a 100% recycled concrete, made by IWA recycled aggregates, eco cement and fly ash.

It has a very low impact on the environment and it is also cheap.

We are now able to bring together ecology and business.

We cannot say it is easy to do it. It is not.

It takes time and efforts to adapt to changes and new technologies.

Now we are expanding our knowledges and experience thru GNN (http://genki-namakon.net/)


Mitsuya Miyamoto (translated by Alberto Ferrari)

All the costs related to remaining concrete: it is not just the disposal cost


The RMC business is becoming more and more simple.

There are only the following categories to think about:

costs for raw materials (cement, admixtures, sand, aggregates)

RMC sale price

fixed costs (for staff and services)


Except for quantities, the other categories don't change so much.

So it is quite easy so determine how much will be the company's income in one year.

Every company must also think about its waste related costs.

The waste are sludge, remaining concrete and returned concrete.

We can say that every plant spend from 1,000,000 yen up to 10,000,000 yen every year to treat these waste.

By starting to use the IWA system we were able to cut all these costs, to reduce the environmental load (CO2 emissions, etc.) and to get in touch with Mapei.

For us it is also important to share our successful story with other plants and GNN members, to show how much we improve our incomes and how much we were able to cut the waste disposal and treating costs.

By recycling our remaining concrete and sludge we were able not only to reduce the environmental load and the disposal costs, but also the extra work and extra salary for our staff (as it is not necessary anymore to break the hardened returned/remaining concrete).

It will be also important to keep the stats regarding the quantity of remaining concrete in one year and the quantity of recycled concrete demand/production.

As the concrete production and so also the waste production will increase in the next few years (with the Olympics and other important projects), it will be important to share and collect as many info and data as possible.

This will be possible thanks to the GNN Association, that can spread info and new technologies across the whole Country.

Mitsuya Miyamoto (translated by Alberto Ferrari)


The common denominator of the plants that want to eliminate the remaining concrete problem


Today's blog is about the IWA (improved water absorption) System for concrete recycling.

We started this project about 7 years ago, to eliminate the remaining and returned concrete from the RMC plants and we received the help from many GNN members.

The most important users for our recycled concrete are not the big General Contractors, but the local companies and house makers branches.

For these local companies 1000 m3 or 5 m3 of remaining concrete create the same trouble. It is not a matter of quantity.

For this reason they desperately want to find a solution to solve this problem.

As the IWA recycled concrete doesn't fit the JIS standards it can be used only in certain situations.

For example parking lots, levelling concrete, rubble concrete, concrete slabs...

Another problem is represented by the difficulties that the new system may face to be accepted by the company's staff. As everybody have been used to a certain type of job, it is not easy to change habits, but after some time evrybody will get used to the new system.

There are also many local concrete associations that don't want this new cheap recycled concrete in their local area. This means that it is easier for a plant that is not part of the local concrete association (OUT plant) to use and sell the IWA concrete.

In our case, as we are part of the association, we have to pay a percentage on every m3 of IWA concrete we sell.

About the marketing of the product/system, recently our chances to reach a wide range of possible customers have increased a lot.

By the way, we can state that the target for the new recycled concrete should be the local construction companies or house maker's branches.

On the other hand, the target for the IWA powder should be OUT plants, with a positive staff that can accept and adapt to the new situation.

So, if also your goal is to eliminate the remaining/returned concrete from your plant, please follow our instructions.

Mitsuya Miyamoyo (translated by Alberto Ferrari)



About the public comment made by the Land, Infrastructure and Transportation Ministry

acrac-thumb-600xauto-921.pngThere is an organization called ACRAC and they are involved in concrete recycling.


As concrete is the second most used material in the world after water, it is very important to find good ways and methods to recycle it.

It could be used as sub base material for roads, but due to many limitations it is not used at all.

Everyone talks about the importance of recycling, but then when it is time to place recycled concrete everybody is afraid of using recycled materials.

In the GNN Group there is also a young plant manager, Mr. Matsuda of Tokyo Techno.

He is involved in concrete recycling and he is dedicating himself to study and make projects about recycled materials.

So the public comment made by the Ministry of Land, Infrastructure and Tourism about avoiding the use of recycled materials had a big impact on him.

A comment like that, made by such important persons will produce a big impact on the future of recycling materials.

Of course from now on big General Contractors and House Makers will not be willing to use recycled materials.

So all the people involved in the concrete business will have to do something and re-think about the future of the concrete recycling.

Also for this reason, on November 18 there will be a panel discussion at the GNN Conference in Tokyo, dedicated to concrete recycling. The leader will be Mr. Matsuda and the following organizations will participate:


Osaka-Hyogo working group for concrete recycling

Various Universities Professors

So this is one of the reasons why you should come to participate to this year GNN event.

Mitsuya Miyamoto (translated by Alberto Ferrari)




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Let's help to save the global environment


People can be divided into:

scientists or artists

left wing or right wing

left handed or right handed


For every 100 persons of one kind there are different 100 persons.

This is the nature.

I think that I am an artist.

And this is thanks to my mother (and NR president) Miyo.

When I was an elementary school student I went home with some math exercises. They were about "how to read the clock".

The goal was simply to read the clock.

But my mother misunderstood and made me study the sexagesimal system's addition and subtractions.

And this is where the "tragedy" began.

It took me two years to complete this task and this didn't satisfied my mother's expectations.

"Why Mitsuya cannot calculate the time??"

This problems made me choose to try to be an artist and not a scientist.

But then life, after the graduation from the University, took me to a science path. I had to go back to my family's concrete company.

So I had to study many new things, especially science and technical stuff.

One of the biggest problems for a RMC company is reperesented by its waste. One of these is the sludge.

Until now it was just a very pollutant waste, but finally we found a solution to treat it and reuse it!

This will bring a very big help to protect the environment as now in every Japanese RMC plant (about 3400) there is a mountain of sludge. A huge amount.

It is one of the most important projects that recently I'm dealing with.

Let's do something for our environment!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Also our Italian employee Alberto Ferrari is looking forward to the Tokyo Olympics


Our employee Alberto Ferrari came 6 years ago from Venice, Italy.

It is really surprising how he decided to come to work in a small plants in the middle of the mountains.

It happens many times that he feel uncomfortable with some bad Japanese manners and I feel ashamed for that.

We are living in a globalized society and Japan cannot think only about itself anymore.

Recently I was negatively impressed by the decision of UK to exit Europe and I hope that Japan won't go in that direction.

Alberto helped me a lot to change my mind and become more "global".

I never felt being treated different from the locals in every Country I visited and I'd like that also Japan could treat the foreigners that live here in the same way.

The biggest problem for Japanese people when they want to learn english is to try to speak the "prefect english". And this is the reason why many of them (us) fail.

In these 6 years I improved my english a lot and now I'm used to do the business english too.

Anyway, Tokyo Olympics are very near and we think that the problem of returned/remaining concrete will become bigger and bigger.

This is why Alberto (product manager) thought that the IWA System could be the solution.

He was the person that created this System and connected NR and Mapei and so he feel a big responsibility about this.

In today meeting we talked about the possibilities to expand the IWA System with the help of GNN's 91 plants.

We will target the small plants that are out of the local Associations and that produce a lot of Non-JIS concrete.

The Olympics will bring many new infrastructures and jobsites and this means more returned and remaining concrete to treat too. The costs to throw it away are getting higher year by year.

So a solution is necessary.

Only 3 years are left.

The problem is also the stubborn way of thinking of many people in the Government.

But we cannot give up and will continue to push our new ideas to help to solve everybody's problems.


Mitsuya Miyamoto (translated by Alberto Ferrari)



The difference between returned concrete and remaining concrete


In every field there are many words that look very similar.

Two of these are "returned concrete" and "remaining concrete".

They both refer to concrete that is not used, that comes back and that becomes a waste.

Even in the RMC Industry there are many persons that don't understand the difference.

So I will try to explain it.

The returned concrete is the fresh mix that comes back from the jobsite without being used at all.

The remaining concrete is the fresh concrete that remained unused in the truck mixer.

This is the difference in terms of words.

But there is also another difference.

The remaining concrete is the one that creates more troubles to the involved parties.

"But isn't the returned concrete troublesome too?".

This is a good question.

The RMC plants are divided into 2 big groups:

Big size and small size.

The big size plants are those that work a lot with big general contractors, so usually have a few very big jobsites to deal with.

The small size plants are those that everyday must deliver small quantities of concrete to many different small jobsites. Usually they work a lot with small local constructors.

As both returned and remaining concrete are something that happen at the end of the jobsite, they create more troubles to the small size plants than the big ones.

It is usually being said that "returned concrete costs a lot to the plant", but it will be more appropriate to say that as it has been not used at all it is not a waste yet and so can be applied the cancel fee. So the real problem is represented by the remaining concrete.

This problem was never been solved.

This is due to a wrong way of thinking.

"We can't do anything about it and so let's keep going this way".

But the right way of thinking should be "let's try something, even if we will fail".

GNN is here to help all the Japanese RMC plants, especially the small-medium sized ones, to solve their problems and the one regarding the remaining concrete is one of these.


Mitsuya Miyamoto (translated by Alberto Ferrari)

"400,000m3"- A new way to use


The value of (the same) things change in different environments.

If you are in the middle of the desert you will pay 10,000 yen for a tea bottle.

But nobody cares about an automatic beverages machine in a desolated place.

Also, at Disneyland everything is more expensive than anywhere else.

Even if you propose a very rich, delicious food to a guy that just ate a big rice bowl, he can't and won't eat it as his stomach is already full.

The same concept can be applied to GNN's technology to recycle returned concrete.

We started it at Nagaoka RMC because we were worried about our environment and so we think that many other concrete plants are facing the same problem.

But it doesn't make sense to try to explain the IWA system to a lady that's walking in the street.

Recently it happens that some persons working at a famous Japanese house maker sent me an inquiry about the IWA system.

Normally, the RMC companies take the unused concrete waste away from the jobsite and recently the costs for the house makers are getting increasingly high, mostly in urban areas.

This is becoming a problem, especially for small-medium house maker companies, that have many small jobsites to clean from their waste.

That's why I realized we have the solution for them too.

The solution is to use the IWA system directly at the jobsite, producing recycled aggregates that will be used there, as filling material. This will transform a waste into a resource, generating additional incomes.

All over Japan about 800,000 houses are built every year.

If we think that 0,5m3 of unused concrete will be left at the jobsite, we have 400,000m3 of unused concrete every year.

We are talking about big numbers.

One of GNN strongest points is to have many different solutions and also for concrete recycling we have many. Not only IWA, but also paper powder called Cell-Drone.

One of our goals is to push the recycling concept in our field.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Concrete recycling in Yamagata




In Yamagata there is a "punk style" RMC factory, called Mitsuwa: http://necon.co.jp/

It is a so called Out Plant, as it is not part of the local RMC Association.

Just for the record, also my mother Miyo Miyamoto was born in Yamagata Prefecture and so I used to go to visit my parents there, since I was a child.

Yamagata is famous all over Japan for its delicious food, people's kindness and for its low temperature in winter and hot temperature in summer.

In Yamagata also all the taxi drivers are extremely kind and I've never had a bad experience.

Today I've used one of the Zao Taxi and the driver, Mr. Endo, has been very kind and gave me good advices. I'd like also to thank that lady that helped me to find the way once I got out the Yamagata station south exit.

So, I reccomend to everyone to visit Yamagata at least once.

This is the place where Mitsuwa RMC is located.

Since April of 2014 they entered GNN and decided to adopt our system for concrete recycling.

Even if they don't have big machineries, neither a big plant with a lot of free space, they were able to succeed with the IWA system.

This is an important point: just do, without thinking too much, nor complaining.

Unfortunately people like Mr. Akatsuka (Mitsuwa's president) are just a few.

Recently I'm going around to visit all the plants that are using our IWA system for concrete recycling and today I interviewed Mitsuwa's factory manager, Mr. Yamakawa.

I was able to listen from him about how the IWA system is proceeding here, in a place where the concrete production is very few in the very cold winters and in the very hot summers.

For him the IWA system is now a very important part of the company and when I asked how they started he told me "just by doing!".

So now, at Mitsuwa RMC, they are not worrying about unused/returned concrete anymore.

When I visited them for the first time 3 years ago they had a huge amount of concrete waste and now I feel very happy and impressed as it disappeared.



So, these are the reasons why they started (and succeeded) to use the IWA system:

President Akatsuka's willing to test new technologies.

Need to have something new to challenge the local association.

Mr. Yamakawa's open mind.

The "quality first" doctrine.

Good communication skills with customers.

So the need to solve a problem is not enough to succeed, without the above characteristics.

I'm always very happy to meet people that made it to solve their problems ant to be a small part of their success.


Mitsuya Miyamoto (translated by Alberto Ferrari)


"Chalks and blackboard"- The RMC's IT strategy



When I was a student we used chalks and blackboard.

When my son entered the elementary school they were still using chalks and blackboard.

At the same time, I think that in many other schools they are now using whiteboard and magic markers.

When using computers we write power point files.

Anyway, chalks and blackboards, magick markers and whiteboards will never be completely abandoned.

Is this something that nobody thinks except me?

Even if I might look like a school teacher, I tried to explain our Re-Con Zero/IWA technology for concrete recycling by using a marker and a whiteboard.


It often happens that people tell us RMC companies that they don't understand what we say.

The RMC Industry was born about 70 years ago, but for a lot of people the RMC technical terms are still unknown. So now we are trying to explain them in a more simple way, by using internet.

And this time by using a manual, old way.

When we try to explain the meaning of IWA by spelling Improved Water Absorption, most of the Japanese people don't understand.

Returned concrete is the concrete that comes back from the jobsite to the plant.

It is very important to explain things in a simple way.

I'd be happy if people understand that by using our method they can earn profit.

We could just say that they can improve their incomes by 10,000,000 yen every year. But they can also help to have a better environment by recycling unused concrete.

I will continue from now on to try to explain our world to everyone by using the internet.


Mitsuya Miyamoto (translated by Alberto Ferrari)


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Sludge, the ingredient to create a material to substitute mortar. INNOVATION

There is a new resource against the vertical society wall that hampered the small and medium sized businesses.

The internet allows to jump over this wall.

Before the internet era, to promote a product, it was necessary to go through many levels of persons.

As these levels were made by persons, that have feelings, many times the information about the products couldn't reach the interested people.

Now it has became possible to share information freely, without walls.

It is now easier to find the info we're looking for.

Since yesterday, for three days, about 100 persons of the RMC industry came to our plant, to see our innovative solutions.

In the video below you can see a technology that I think is very innovative:


Sometimes, to pour concrete, it is necessary to use a pump machine.

If concrete is poured directly into the pump machine without anything before, the machine will get stuck. So it is necessary to pump before some mortar (concrete without gravel).

This mortar then, must be thrown away.

It cannot be thrown away easily, as it is a special waste.

Usually it is 0,5m3.

When 0,5m3 of concrete are ordered by a customer it is a small quantity, but when 0,5m3 of mortar must be thrown away it is a big quantity.

The other day Mr. Takeda from Seiwa YBJ and Mr. Nakamura from Kawabata Kogyo came to visit us, from Shizuoka Prefecture and Fukui Prefecture.

Without internet and GNN I couldn't met these guys.

Well, by using the powder obtained with Super Cyclone (solution of about 18 liters), that I've introduced to you before, we can substitute this mortar. It is a very eco-friendly solution.

Now everywhere in Japan and in the world 0,5m3 of mortar are used everytime and they create a big load on the environment.

We have a new, innovative solution.

Today many technicians and very positive RMC plant owners came to visit us and I think that with their help and support we, as GNN platform, will expand this solution through Japan.


Mitsuya Miyamoto (translated by Alberto Ferrari)

The familiar innovators: managers that stare at the persons, not at the money

When we start something new it is not so easy.

In this quite old framework it is shown a theory about the innovators:

When something new is released, in the beginning only the 2,5% of the people is interested in it.

Also in my perosnal experience, when a new product is launched, in the beginning the persons that are interested are very few. Because many are afraid to fail. Then, after a while, when it becomes clear that the new product is good, many persons start to get interested. These are the so called early adopters. There is the early majority and the late majority.

At this point the product is already well known and the business has started.

When we talk about RMC we must talk about the RMC related waste, returned/unused concrete.

Everybody says that it is a big problem, but maybe just the 1% of them do something about it. Do the innovators represent only the 1% of the RMC industry? If so it is a very low percentage, compared to other fields.

My target is to clean all the RMC plants from their waste.

The IWA System is not the only solution, there are many and I want to help every RMC plant to get these solutions and use them to create a better environment.

If anyone is interested I am very open to give any necessary information .

One of the most innovsative persons I know is Mr. Takenami, from Shiraishi Kensetsu.

I introduced him to you before. He is a person that do something before talking about it.

He's part of the IWA project and he was also able to improve it by himself.

In the GNN group there are also other innovators.

They don't complain or talk a lot, but act.

Today I interviewed Mr. Takenami:

"How have you been able to succeed with the IWA System?"

"I was feeling that my staff was concerned about the returned/unused concrete and so I thought that I must have done something about it".

So, the reason was not the money, but the people.

The IWA System has an initial cost, for the chemical powder.

So many persons say that it is too expensive.

The innovators instead, don't care so much about this. They care more about the people.

We, as innovators, want to eliminate the problem related to the concrete waste from all over Japan.


Mitsuya Miyamoto (translated by Alberto Ferrari)

About sludge-mortar: the challenge of the lost generation

2 years ago I was smoking a lot and I couldn't understood why people liked outdoor amusement and running marathon so much.

Now I can't believe I changed so much!

This morning, together with some other GNN friends, I've been able to finish the Obuse half marathon in about 2 hours.

The last 5 kilometers have been very hard, but I was able to get the power from the people and the children around and finish the run. I was so happy and tired that I cried!

Well now, let's change argument and talk about RMC.

There is a product called Sludge-Mortar and it helped GNN to grow since the beginning.

It was invented about 20 years ago and it is still a very innovative product.

Recently many products to recycle RMC related waste came on the market, but Sludge-Mortar is one of the pioneer products.


I'd like also to introduce Mr. Kaneko, who is the person in charge of Sludge-Mortar business at Kaneko Concrete.

I met him at a technical conference about 10 years ago.

I was one of the two RMC companies that had a booth at that conference. Many RMC people was there but no one seemed to be interested in my products. Except for Kaneko. He was wearing an elegant suit and said "that's very interesting!".

When I started to talk to him I realize that he was his company's CEO like me and he had my same age (born in 1978).

After a few days we were talking like we were old friends.

We are both sons of the so called "lost generation".

We are both hoping to be able to renew the RMC industry.

For this reason we started GNN and Sludge-Mortar is one of its pillars.


Keisuke Kaneko is:


Too kind

His presentations are too long

But for many other reasons he's one of my best partners in this adventure to change the RMC world.

Since we met 10 years passed and let's see what we will be able to do in the next 10 years.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Flowers and concrete

In every company and every industry colors are important.

In every company that uses concrete it is the same:

in civil engineering companies,

exterior companies,

architectural studios,

house makers,


I use to go around to visit many of these companies as sales man.

For a sales man it is very important to find a nice landscape, with flowers and plants, in a company that he visits.

It is as much important as a cup of tea. The place that he visits is like an oasis in the middle of the city.

Usually concrete is seen as an enemy for flowers, because of alkali.

The pH level of our concrete usually is more than 12.

A land that have been put under ground improvement works and so is full of cement, is like hell for flowers.

Both concrete and flowers, for different reasons are very important for the people.

We launched a new project about this.

We aim to produce a concrete with pH of about 8.

To do so we have 2 choices:

Use neutralized cement or

neutralize already produced concrete.

We choose the latter one.

In chemical terms, we must transform the main component from Ca(OH)2 to CaCO3, calcium carbonate.

CaCO3 is an inoffensive material, that's often used also in food products.

But as the trend is to use more and more high strenght concrete (with more cement inside) it will be a very hard challenge to reduce the alkali content.

We as GNN will do our best to produce and offer a concrete as environmental friendly as possible, as our society needs both concrete and flowers.


Mitsuya Miyamoto (translated by Alberto Ferrari)


"The perfect circular city"- Return a favor to the hometown

"The chimneys are not smelling bad anymore".

Did you ever had this thought?

If you were born more than 20 years ago maybe you can remember that the air in cities with many chimneys was smelly and dirty.

In this area we may think about Fuji City.

It is the city of paper production. Some years ago you could not even leave you car's windows open once getting close to it.

We can say the same thing for places close to incinerator plants.

Thanks to new technologies now most of the bad smells are not disturbing anymore.

There is a technology called "desulfurizing".

Its important point is not let SOx agents to be released in the air. These agents are sulfurs contained in oil and carbon and they are released once they get burned, generating dirty rains and bad smelling air.

The technology used to avoid these deleterious materials to spread during combustion, is based on limestone.

In Japan there is plenty of it and it is obtained by breaking the mountains. The first use was as desulfurizing agent.

Then it is used in cement, aggregates and paints.

So, the chimneys are not smelling anymore by breaking mountains.

But we cannot break our mountains forever and so we must do something, together with our business partners (local public administrators, GNN members, Mapei, etc.).

Today we made the first step.


One of the most problematic and expensive waste for all the RMC companies is the concrete sludge.

By using a machinery called "Super Cyclon", we will be able to get CaCO3 from our sludge waste.

And so, from today we could be able to use the obtained CaCO3 as desulfurizing agent for the local incinerator plants.

Also, the Italian admixtures maker Mapei has another interesting technology.

The incinerator plants generate also fly ashes. They are a waste, but they can be transformed into re-usable sand and aggregates. Of course they can be re-usable also at our RMC plants.

So, we can eliminate all our waste and at the same time obtain a re-usable material.

In every local area there are incinerator plants and RMC factories.

In the past I had to go around Japan to promote my products, but now it is the IT era and we can reach many different places without going out from our homes and offices.

We must return a favor to our hometowns, by cleaning them from the waste and today we took the first step to do it.


Mitsuya Miyamoto (translated by Alberto Ferrari)


"The choice of business partners"- Even without raw materials Kawabata Kogyo can create

"Don't talk like that, don't say bad things".

In the past usually people told me: "if you are angry you can't avoid to say bad things".

Recently I understood why.

I think that if there is something that we think it's wrong, it is necessary to say something about  it, better if in presence of the person himself.

Today, I've thought very good things about one person.

Usually I think it is not good to have weak persons around. Persons that just criticize, without taking risks.

Business men must take risks to get the results they're looking for.

I don't want to say anything negative about people that don't like to take risks and live an easy life, I just don't want them to be an obstacle for me or my business partners.

Business men must also take responsibilities for their actions.

The IWA System, to recycle returned and unused concrete, is proceeding well, with GNN members consortium.

We started our new project to eliminate all waste from our RMC plants.

Many RMC plants have found many reasons not to try our system, but a pump machine company choosed to be part of our project. Its name is Kawabata Kogyo, based in Fukui Prefecture.

The returned and unused concrete, is a big problem for all the parties involved: contractors, RMC plants and pump machine companies.

The weak people usually think it is better to just cover things that stink.

Mr. Nakamura (president of Kawabata Kogyo) instead, saw an opportunity in this problem of concrete waste.

"I will be happy to get returned/unused concrete!" he said.

Not only this. In the Kawabata Kogyo's neighborhood many RMC plants are closing down and so many construction companies are left without concrete suppliers. Mr. Nakamura then decided to offer them to be their concrete supplier. Even if he just owns a pump machine company.

To me it is unbelievable.

Normally, if a RMC company closes down, a pump machine company is not so much involved.

But Mr. Nakamura decided not only to get returned/unused concrete, but to create a new recycled material from it.

It is a very important lesson also for me, as I understood that we have many choices in life, even when we may think that something is difficult or impossible.

Even if they are a pump machine company and don't have returned/unused concrete nor the machineries necessary to produce concrete they decided to be part of our IWA System project.

Even if they have all the reasons not to be part of it, they decided to help us.

So, just get busy, get into action without say anything bad about anyone. We don't have time to waste time with lazy people. This is the lesson.


Mitsuya Miyamoto (translated by Alberto Ferrari)




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The IWA System's evolution after 6 years of experience- The IWA manual


On Christmas of 2009 we received a mail from Italy.

At that time we were marketing and selling WA-21 (Remic Maruhachi's Re-System 21). So we put our products also on the JETRO website. It is where Alberto Ferrari found us.

A few months later, in the beginning of 2010, he and his father Giorgio came to Izu Nagaoka for 3 days and 2 nights. In that period I didn't know anything about international business and neither about Mapei, so I didn't put much hope nor interest in that visit.

So I almost forgot about it. But after 3 months I received a request from Italy, about a collaboration between Mapei and GNN to develop a new system for concrete recycling.

In the summer of that same year I was in Milan, signing a contract of collaboration.

In 2011 we imported the Re-Con ZERO (IWA) powder for the first time in Japan and started a co-working project with 15 GNN members.

Since then we faced and solved many troubles. With the method shown in the video above we faced some troubles:

the truck mixer must stop its deliveries for 20 minutes or more

it didn't worked well all the times, because of the different conditions of returned concrete

These problems seemed not easy to solve, but a GNN member, Shiraishi Kensetsu (based in Okayama) gave us the solution.


We don't need to use the truck mixer anymore. The returned concrete is discharged into a pool and treated there with the IWA powder.

So the trucks don't need to wait until the next delivery and the condition of the returned concrete can be checked and adjusted in terms of slump and consistency.

No need to say that as the System became easier, the number of users grew a lot.

Of course many plants still feel more comfortable to process the returned concrete by using the mixer.

Another important point of Mr. Takenami's discovery is that in the pool also the sludge can be mixed with returned concrete and treated as well.

Another problem was that sometimes the produced aggregates hardened together the day after and were not easy to break. We solved this too, by mixing previously made IWA aggregates to the fresh ones. By doing this we don't face the problem of too hard aggregates blocks anymore.

In these last 6 years we tried to solve all the problems that the users could have faced.

There will always be some people that find any kind of reason not to use this system, but we try to reduce those reasons as much as possible.

Recently another GNN member was able to solve a problem related to the absence of an excavator at the plant.

The Kakegawa City (Shizuoka Prefecture) based Ozaki RMC became able to treat its returned concrete with a loader, as in the video below:


The recently established GNN working group/consortium for the development of the IWA System is helping us a lot. It is very important to work together, united for the same goal.

In these 6 years many things changed, both at work and in our private lifes.

Even if there may be positive and negative changes, change itself is good.

Mitsuya Miyamoto (translated by Alberto Ferrari)


How to solve the problem of returned concrete in Japan- The 166 times challenge

"I want to enter Tokyo University".

With this dream, I've entered a book shop looking for a textbook that could have helped me to reach that goal. And just by doing this I felt satisfied.

Dreaming doesn't cost anything and bring sweet feelings.

Everybody has dreams that will realize after a few years.

So, I bought a book about marketing and while I was reading it, I had many different feelings. But could not find a good way to transform what I just read from words into reality. So I thought that I could have easily stop putting efforts into it, as nobody wasn't expecting anything from me.

The same thing happens with diet (in my company there are many guys that have this problem).

In the beginning everybody is very positive and put many efforts into it, but then after a while they start thinking that even if they gain some weight again it is not such a bad thing... and they get fat again...

Even if it doesn't look like such a difficult thing itself (if you don't eat much and work hard you will lose weight), to transform a dream into reality is the most difficult thing to do.

Entering Tokyo University is the same.

The only thing to do is study hard. Just one thing. But not everybody can do it.

In the case of our job it is also the same.

When we start a project not always we are able to finish it  and realize our dream at 100% (for many different reasons).

In my case, when I started the IWA project together with Mapei (the italian chemical maker) I had a dream: to solve the problem of returned/unused concrete in Japan.

I thought that everybody would have helped me and I was very excited.

But I faced a lot of troubles and oppositions on my way (even in my own company).

In Japan we have about 2,500,000 m3 of returned/unused concrete every year.

To treat these we would need 2,500,000 sets of IWA powder (Re-Con ZERO EVO, part A and part B), that means 210,000 sets a month.

This is a dream.

The reality is that we are treating about 1,200 m3 every month with the IWA System.

So 1,200 m3 (reality) against 210,000 m3 (dream).

About 166 times different.

No way to transform dream into reality right?

Maybe. But I am really convinced that in the future Japan will have to solve this problem of returned concrete and concrete related waste.

When we started 6 years ago the m3 of concrete treated with IWA were 0. Now they are 1,200 every month. And we will multiply it for 166!


Mitsuya Miyamoto (translated by Alberto Ferrari)

"Entrance, exit, buffer"- Recycle's general rule

Setup eight.

Measure twice, cut once.

There are many ways to say it, but it is important to prepare beforehand when starting something new. The result will change radically.

I started to think about concrete recycling (returned concrete/unused concrete) about 10 years ago and I understood that the first principle is the entrance and exit buffer.

I think that this principle, about recycling, can apply to many other fields.

There are many technologies for concrete recycling. One of these is the IWA System.

The entrance is represented by technologies (IWA powder) for the treatment of returned/unused concrete and of course returned/unused concrete.

The buffer is represented by the presence of stockyard, machines and human resources.

The exit is represented by the presence of a market for the obtained recycled materials (recycled concrete and recycles aggregates).

Usually the biggest problem is the fact that there is no market to sell the recycled materials. So NO EXIT.

Or, sometimes, even in presence of entrance and exit, there is the problem of buffer (no stockyard or machinery). Especially in big cities, the RMC plants don't have so much space to stock the recycled aggregates.

So, even with good technologies, often the desidered result cannot be obtained.

If one part is missing, the whole system cannot work.

At the moment, GNN and Seiwa YDB are working to recycle concrete sludge with an innovative method.

The biggest problem for every RMC plant, concrete sludge, can be seen as a precious resource? We are getting more and more convinced that it can be. Our dream is to transform the cost for sludge disposal into a value.

Also in this case entrance, buffer and exit are very important.

GNN can represent the entrance with its experience and new technoligies and also the exit for its many connections and different markets opportunities.

We can' wait to see how this new dream will develop further!


Mitsuya Miyamoto (translated by Alberto FerrarI)

"Waste buried in the dark"- The non perception of returned/unused concrete

Cover things that stink.

Act like they don't exist.

Even if we know that it is not right, sometimes we do it, unconsciously.

The same thing happens also in the Construction Industry.

Cover things that stink.

Act like they don't exist.

In this case we talk about returned and unused concrete (industrial waste).

Even if everybody knows about it, nobody seems to care about it.

Usually, when there is a jobsite, the price is based on materials (concrete, asphalt) and waste treatment costs.

The price can change based on the different local areas.

About unused concrete, even if it is something that happens at the jobsite, nobody want to show it or talk about its related costs.

Usually, a deal is made between RMC plant and construction company to pay the disposal of it.

Even if everybody knows about it, nobody wants to deal with it.

Today I came to Kakegawa City to explain about this argument to the people working at the City Hall, so I asked to Mr. Suzuki from Fujimoto Gumi (a construction company based in Kakegawa) to come with me.

I think it is important to introduce GNN new technologies to any local area's most influent people.

Our goal is to give solutions to every area's unsolved problems.

For example:

reduction of natural resources (aggregates, sand, etc.)

reduction of areas for disposal of waste

RMC plants related noise and pollution


In the case of Kakegawa, luckily we can lean on Ozaki RMC, a local GNN member plant.

They are able to get info about new technologies and then apply them locally.

We as GNN are moving forward, connecting also with other positive alliances, like YDN (a group of Civil Engineering experts from all over Japan), to give the best answers to the biggest problems our society is facing.



Mitsuya Miyamoto (translated by Alberto Ferrari)

The new machine that can recycle and produce, ALL IN ONE!

Usually we think that it is not good to do two things at the same time:

watching tv and eating

type the cellphone and listen to somebody

drive and talk on the phone (in this case you can also being pulled over by the guys in blue)

But, in this case doing two things at the same time can be very useful.

It's the case of MOBIX, made by the well known Japanese machines maker NIKKO.



Can you guess what can be used for?

It has wheels, so it can be moved.

It has a belt conveyor, so it can deliver the produced materials to the choosen destination.

It has a mixer, so it can produce concrete (and perform other operations).

It can measure weights.

It can be used anywhere, at the plant or directly at the jobsite.

We can use it for our IWA System, to transform returned concrete into recycled aggregates and then into new concrete on the same day. And we can use it also to produce water permeable concrete.

Everything can be made at the same time, with the same machine. ALL IN ONE.

These possibilities have been discovered by Mr. Takenami of Shiraishi Kensetsu (RMC plant based in Okayama City) and Mr. Yamamoto of NIKKO.

So RMC plant and maker worked together, co-created something. It is not very usual in Japan.

We all hope that these kind of projects will become more and more!


Mitsuya Miyamoto (translated by Alberto Ferrari)

Finally, it came...The Ministry of Land, Infrastructure, Transport and Tourism's absurd public comment and the low sense of ownership of the RMC Industry

This post is about the public comment made on June 13 by the Ministry of Land, Infrastructure, Transport and Tourism. They have received many comments and opinions from concrete experts (also from many GNN members), but they decided to leave it as it is, without corrections. So, it is prohibited to use recycled aggregates from concrete wash.


This means that the Japanese administration about construction does not care about the depletion of natural resources and neither about the fact that the places to discharge waste are getting fewer.

On the contrary, in Europe the use of recycled materials is increasing and it is getting very popular.

Of course Japan is a very particular country because of many earthquakes, but it is very difficult to understand and accept the fact that we are not allowed to recycle concrete and reuse recycled aggregates, even if it is proved that we could make it without any problem.

It is also sad to see that only a few concrete plants had something to say about this. Only 12/13 on the total of 3400. We as RMC Industry should be more united and involved in these decisions.

Because of the strict rules that now regulate the use of recycled materials, even if a plant would like to do it it is too complicated and expensive.

Looking Japan from outside, a foreign person would think:

This country is bad

This rules are bad

The whole mechanism is bad

And so, the whole Japanese RMC Industry is bad.

The world is changing, focusing more and more on the best way to recycle and reuse everything, but the Japanese RMC Industry is not moving forward. We need a change.

So GNN has to do its best to promote a change and the concrete plants need to be more conscious about their role in the society.


Mitsuya Miyamoto (translated by Alberto Ferrari)



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The "in house" recycle/reuse theory

I've heard for the first time about the "in house" theory from Mapei's scientist and researcher Mr. Giorgio Ferrari and I think it is very important.

I have started to be involved in recycle issues since about 10 years ago.

At that time I have been introduced by Mr. Yamashita, president of Remic Maruhachi (a Gifu Prefecture based GNN concrete plant), to Mr. Matsumoto of Re-System 21, the inventor of WA-21.

WA-21 is a product (absorbant polymer) that once mixed with the returned/unused concrete inside the drum machine, absorbs water and generates a dry recycled material that can be used as road sub-base.

The first time I saw that process I thought that it was so logic to recycle unused concrete, cutting disposal costs and being able to obtain a recycled material that can be re-used generating a new profit.

This is the reason why I decided to start selling it besides our already existing porous concrete business.

Unfortunately we weren't able to sell it that much. The most important reason was that we didn't follow the "in house theory".

For example, when I have a product that I want to sell, I try my best to push it, without thinking that much about my customer needs or feelings. So, I will maybe be able to sell it once, but the business probably won't last long.

When we try to sell something we must keep in mind also our customer business and how can we help him to develop and grew his business.

WA-21 is used to recycle concrete. So we should have thought also about how to sell the dry material obtained from it. But at that time we didn't.

RMC factories are selling RMC and not recycled aggregates, so the material obtained with WA-21 stocked in the concrete factories remained there, without being sold.

Then came Mr. Giorgio Ferrari, with his "in house theory".

As RMC factory must sell RMC, we must be able to use ourselves the obtained recycled material, to produce a new recycled concrete ("in house, homemade").

So from WA-21 we switched to the IWA System.

With the recycled aggregates produced by the IWA System, we can obtain new concrete for slabs, carparks and many types of Non-JIS concrete.

At the moment we produce about 400m3 of this recycled concrete every month and beacause our returned/unused concrete is also 400m3 a month the cycle is perfect.

Also other GNN members started to use this system and now more that 2000m3 of recycled concrete are produced every month in different areas of Japan.

Every area and every customer are different and so something that worked well here maybe won't work well anywhere. For this reason it is important also to treat every case differently.



Mitsuya Miyamoto (translated by Alberto Ferrari)

Aggregates and Ready Mixed Concrete

"That's too innovative!"

This is a comment that I hear often when something goes wrong with a product.

Someone that tried many challenges in life can understand it. If you are not really ready to fight and don't believe 100% in a project you can find many reasons to fail.

So, even if a product or a project are extremely good, if the team is not ready to work hard and face challenges, nothing good will happen.

There are too many persons tha use to say "that's too innovative!".

So for a new project or a new product it is very important to have many challengers around.

Looking from outside the RMC Industry may seem not too innovative, but instead there are many challenges going on.

As you might know, concrete is made by blending together water, cement, aggregates (gravel, sand) and admixtures. There are many different kinds and types of admixtures, cement and aggregates.

Talking about aggregates, we have natural aggregates, artificial aggregates (lightweight, etc), and secondary products.

These secondary products are obtained from different kinds of waste/recycling. For example slags, that can be obtained from steel production and incinerators.

As concrete is the most used material in the world after water, it is very important to recycle it.

In these years many tried to recycle unused/returned concrete into recycled aggregates, but very few succeeded.

Even if everybody agrees about the fact that recycling and environmental issues are important, not so many people is willing to go through many challenges.

Blast furnace slag, copper slag, ferronickel slag, recycled aggregates L, M, H and recovered aggregates are the most known types of recycled materials and for many reasons ("that's too new, too innovative") they are still not so popular in Japan.

6 years ago we started our project to produce recycled aggregates by mixing a superabsorbant polymer into the returned concrete.

In the beginning we thought it was easy to spread such an innovative technology all around the Country, but then we started to understand how difficult it is for new technologies to be accepted and to become popular. 

In many other foreign countries laws allow to blend recycled aggregates to natural ones (at fixed percentages) to produce concrete. In Japan is different. "We have to climb a very high mountain".

Due to the governmental laws we decided to start by using our recycled concrete (with recycled aggregates) for private project and private jobsites. By doing so we started to increase our customers. We will continue to push this recycling project, also for a better environment.



Mitsuya Miyamoto (translated by Alberto Ferrari)

Visiting an Okayama RMC factory: Shiraishi Kensetsu

Today I came to interview one of the guys that helped us a lot in many different projects in the last years.

In December this year our NR Times will reach its 120 number and in that occasion, also to celebrate our 50th year, we would like to collect many interviews, with our best partners.

We met Mr. Takenami some years ago, through internet.

He used to read our NR Times since many years ago and he also knew our website. At that time he had just entered Shiraishi Kensetsu and he was looking for new innovative ideas through the internet.

He first saw an article regarding a jobsite of our porous concrete in Tokyo, Gotanda. There was no GNN yet at that time.

A few years later Shiraishi Kensetsu became one of the most important member on GNN.

I was really surprised when they succeeded to start the IWA System at their plant in just one day!

Usually it is very difficult to start, beacuse of the JIS 5308, but they were incredibly fast.

Everyday we must take care of many different things, most of them related to JIS, and so we don't have time or don't care too much about other important things.

Mr. Takenami, who is now leading one of the most busy Okayama out-plant (not member of the local Association), said that if "he thinks that something is important, he will immediately put there more efforts".

To change is always difficult, but if you believe in something strongly you can. This is his motto.

From now on we will face another exciting 50 years in our RMC business, with our important business partners.



Mitsuya Miyamoto (translated by Alberto Ferrari)

Incinerator plants, desulfurizing agents, melted slag and RMC plants

"The chimneys are not smelling bad anymore".

Did you ever had this thought?

If you were born more than 20 years ago maybe you can remember that the air in cities with many chimneys was smelly and dirty.

In this area we may think about Fuji City.

It is the city of paper production. Some years ago you could not even leave you car's windows open once getting close to it.

We can say the same thing for places close to incinerator plants.

Thanks to new technologies now most of the bad smells are not disturbing anymore.

There is a technology called "desulfurizing".

Its important point is not let SOx agents to be released in the air. These agents are sulfurs contained in oil and carbon and they are released once they get burned, generating dirty rains and bad smelling air.

The technology used to avoid these deleterious materials to spread during combustion, is based on limestone.

In the incinerator plants of Shizuoka Prefecture every year 1250 tons of limestone are used.

A company based in Shizuoka named Seiwa YDB invented a technology that allows to transform concrete sludges into high quality limestone.

As sludges come from concrete, which includes cement and as cement is made by limestone we can easily understand the mechanism.

Nagaoka RMC and Seiwa YDB are dealing with completely different kind of businesses, but we met because of this innovative technology, thanks to internet.

Without internet communication probably we would have never meet each other and work together.

By this technology incinerator plants can avoid the generation of bad smells and polluting agents and save money as they won't have to buy expensive limestone and RMC plants can reduce or even eliminate the problem related to sludges (and also get paid for them).

By putting together 2 different companies and some willing local persons we are able to work on this new innovative project and to spread it also outside Japan.

Will keep you informed!


Mitsuya Miyamoto (translated by Alberto Ferrari)


JIS A 5021~5022 : the real reason why recycled aggregates are not popular

The RMC production follows the rules of JIS A 5308.

Each plant must show its JIS attestation.

Recycle and reuse is not something related only to the RMC or construction industries, but to the whole human society. So it also must be regulated.

In Japan, the RMC recyclying matter is regulated by:

JIS A 5021 (recycled aggregates for concrete type H)

JIS A 5022 (recycled aggregates for concrete type M)

JIS A 5023 (recycled aggregates for concrete type L)

and we must follow these rules.

Of course, people who is not involved in the concrete world doesn't understand (and doesn't need to know nor understand) these rules, but they are difficult to understand also for us.

If we try to do a research about how many Japanese plants are actually producing recycled concrete following the above rules we see that they are not 500... they are not even 100... they are...0!

So it is very easy to understand not only for us that are involved but for everyone, that this system, based on these rules, is not working well.

Let's be clear, in Japan nobody is recycling concrete waste following the above rules.

This does not mean that nobody is recycling it, beacuse these rules don't apply to private homes or private construction sites. So if there is a jobsite that is not regulated by governmental rules, any kind of recycled concrete can be used (of course if it fits the jobsite/mix design requirements).

Some GNN members that are using our technologies (IWA System, Sludge-mortar) are recently increasing their sales of recycled materials, even if the governmental laws are not helping.

The persons that wrote these rules are very respected and well known. So it is even more difficult to understand why they made these rules that don't allow anyone to spread recycled materials. Because of these rules it is still a very small market but as GNN we will continue to ask for a change.


Mitsuya Miyamoto (translated by Alberto Ferrari)

IT&RMC cooperation. New global strategy to reduce RMC related waste

We are a company with a 50 years long history.

Recently we are putting many efforts into the web communication. Our marketing strategy focus on GNN and new technologies.

Usually the RMC business strategy is B to B (business to business), but now we are trying to use a B to C strategy (business to customer/consumer).

Since we started using the internet to promote our products we can say that we were able to get 20 times bigger results. Of course, needing to use less management resources.

So it has been a very big improvement for our company.

Today, at the GNN workshop, came 10 different companies from all over Japan, to share ideas and technologies. So, if we all work together we could multiply our results even more (20 x 10 companies = 200!).

The results that a company can obtain alone is nothing compared to the results that we can obtain working together as a group.

The usual market of a RMC company is fixed, into a 1 hour and 30 minutes range. But with GNN (the alliance that now counts about 90 companies) and the use of internet, our market will reach out these narrow circles and we can reach customers everywhere.

Internet is helping every kind of business, from lawyers to cosmetic companies, to architects, so why not also Ready Mixed Concrete?

Of course RMC cannot be sold too far (for physical and chemical reasons), but we have many other new technologies to sell and spread around Japan.

Until now we had just permeable concrete and concrete repair to promote, but now we also have the IWA System or Sludge-mortar for example.

As everything, also the RMC Industry must evolve and be ready to face new challenges.

One of these is to reduce the waste to 0!

Even if we are just a company located in the countryside between mountains, we are ready to face these new challenges, with the help of internet and new technologies!



Mitsuya Miyamoto (tranlsated by Alberto Ferrari)


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The problem of unused/returned concrete in Japan

The RMC plants can be divided into 2 groups: the ones that can do and the ones that can't do something.

I am not talking in particular about IWA System or Sludge-Mortar, but I'm saying that there are plants that can solve their problems and plants that can't do it.

The causes can be found in many aspects, from the staff to the different local areas.

We, as GNN, are developing and using a special technology to recycle unused/returned concrete, with the help of the Italian admixtures and adhesives maker Mapei (http://www.mapei.com/), called IWA System.

How does it works? It is very simple:

Add a special combination of polymers, admixtures, to the fresh concrete and mix. By doing so recycled gravel and sand are obtained and the can be re-used the next day.

Why there are some plants that can do something and plants that can't? It is very difficult to explain it. By the way one goal of GNN is to help all tha Japanese RMC plants.

One of our partners is the Yokohama based Sakuragaoka Concrete. Its plant manager (Mr. Kondo) is very young, but have a long history in the RCM industry.

Their plant area is very narrow, but this didn't stopped him to push the use of IWA System and so now they are recycling 100% of their returned concrete.

Here is his comment:


Even without the IWA System this plant would have found a solution.

If there is a strong will to solve a problem, no matter what, the problem can be solved.

If there is not this strong will, even if there is a big problem, it won't be solved.

All the positive people in this Country should push and work harder, to make a better society.




Mitsuya Miyamoto (translated by Alberto Ferrari)

Again about the speech of The Ministry of Land, Infrastructure, Transport and Tourism against the use of recycled aggregates

Some weeks ago I wrote here about the speech of the Ministry of Land, Infrastructure, Transport and Tourism.

I would like to explain here again something about recycled aggregates.

Ready Mixed Concrete is made at the batching plant, by mixing aggregates (sand, broken stones and gravel), cement, admixtures and water. Then, it is brought to the jobsite by the agitator trucks. There, it is used to build bridges, houses or any type of buiding. But often not all the concrete is used and so the unused concrete goes back to the batching plant. This is called unused concrete, or also returned concrete.

At the plant it can be let hardened and then thrown away, or washed to separate again the componenst, or treated by special admixtures (GNN technology).

By washing the returned concrete it is possible to obtain again the sand and gravel that composed the concrete. The Government is thinking about prohibiting te re-use of these recycled aggregates, even if both ZENNAMA and Osaka Working Group for an efficient re-use of recycled aggregates have a different opinion.

Also in the GNN group there have been many comments against this Governement's choice.

The recycle and re-use is very popular in a lot of different fields and it is becoming increasingly popular in many Countries, especially in Europe.

But the Government seems not interested in listening to the opinions of experts or people that disagree. We can only hope that by increasing the number of messages on the internet the Government can change some of its ideas and its decisions.


Mitsuya Miyamoto (translated by Alberto Ferrari)

A person decided to come to visit our plant after reading this blog!

"I'm always reading your blog!"

It really surprised me, also because nobody used to read the blog I was writing before...

Yesterday Mr. Nakamura, president of Kawabata Kogyo (http://www.kawabata-cp.com/), the number one pump machines company in Fukui Prefecture, called me and asked me if today he could visit our plant.

And today he really came!

We talked about many possible collaboration, also between GNN and an existing group of pump machines companies. One possibility is about the recycle of the concrete that remains in the pump machine after use.


So, not only RMC plants and General Contractors are concerning about unused/returned concrete.

Then I also introduced him our system for concrete recycling, the IWA System:


I was really surprised by this guy positivity and speed.

As we changed our way of reaching partners and customers, moving from only relying on the trading companies to the internet (Facebook, SNS, etc.), I've got the chance to meet a lot more positive people. Mr. Nakamura is one of these. We are both very interested in developing new projects that can help society and environment protection.

From now on we, as Nagaoka RMC, want to continue developing our businesses by using internet.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Our personal solutions for the future of concrete recycling

We, as pro, must be proud and happy about the job we are doing.

So, we must not just consume and spend what have been created by the persons that cam before us, but we must add some new values every day. We have to take advantage of the opportunities that the global society we are living in offers to us.

Today I went with my son to Joyama, a local mountain very that is a symbol for us.


By walking for just 30 minutes we can get a very beautiful 180 degrees view of the Izu Peninsula.

To think that something is impossible it is just a waste of time. Anything is possible if we believe in it.

15 years ago the concrete recycling was just a dream, but now it has became reality. Day by day, step by step we have been able to fulfil this dream.

We must protect the environment we live in, all together. Starting from now!



Mitsuya Miyamoto (translated by Alberto Ferrari)

The difference between recycle and second hand

Even if in general everybody understand the importance of recycling, then when it is time to use recycled materials some people is against it.

For example, I understand when somebody say that he/she doesn't want to use recycled materials to build his/her house. But, we have to think about the importance of recycling in connection to the environment we are living in.

And plus, the performances of the recycled materials we are dealing are good.

We have to focus on strenght, workability and durability.

"Are they safe in case of an earthquake?"

"What are we going to expect after 30 or 40 years?"

The workability can be judged just by the persons that apply the products, so also their opinion is important.

For example one customer that used our recycled material said that it hardens faster and so he can finish earlier his job and take a rest.

Even if these recycled materials succeed to satisfy all the above specifications, the Government doesn't allow us to use them. So we're allowed to use them just for private jobsites, such as carparks, dog-runs or materials for exteriors.

Our goal is to show that these are not second-hand materials, but materials that can have the same characteristics as new ones.


Mitsuya Miyamoto (translated by Alberto Ferrari)


About this time speech of the Land, Infrastructure and Transportation Ministry

This time I really have to speak loud about my disappointment. People that shows no interested in the RMC Industry are not interested in the future of this Country either.

I'm talking about this time public speech of the Land, Infrastructure and Transportation Ministry.

Even if the Government is supposed to bring on the same policy we can observe many different opinions over there. So we don't understand anymore if the real goal is still to improve the productivity or not.

In the case that we cannot count on our Country's help to do our job, at least we ask them not to put obstacles for us.

They created a strict rule in the JIS about the concrete recycling. Of course, to put rules is not a bad thing itself.  But in this rule is stated that recycled aggregates coming from unused concrete cannot be re-used because of very few records. So they are not considered safe.

To make it short, the Government is giving us very contradictory advices. So this will create very big problems in my opinion. In the near future, as for the big amount of concrete that will be used for the Olympics and the new shinkansen line, also the waste amount will grow.

For this reason the Government should lead the Country, but they are not, apparently. We just ask the Government to listen also our opinions, as we are the experts in this field.

If we work all together we can have a bright future.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Support the concrete recycling

Recently "recycle" has become a sort of catch phrase.

In the construction field you can often hear words like "fast construction" "human resources" "sustainable" and "recycle".

In many different field is used the word "recycle":

recycled plastic, recycled paper, recycled oils, etc.

So, why there is not so much attention on recycled concrete?

I'd like to ask to all my colleagues involved in the RMC field if they have ever used recycled concrete.

Most of them will answer no. This is due also to the very strict laws that regulate the concrete recycling. Also, many of my colleagues think that a company that recycle concrete is not a RMC company anymore. They think that the only job that a RMC factory can do is produce concrete. To recycle it we must pay money to other different companies. Does it sound normal?

I don't want to talk bad about my colleagues, but these are facts.

I understand that there are many reasons to avoid pushing the concrete recycling. For example the strict JIS(tandards), problems of space and machinery.

But to me, a RMC factory must not be able just to produce concrete, but also to recylce it.


Mitsuya Miyamoto (translated by Alberto Ferrari)

Eliminate the waste from the RMC companies

As concrete is the second most used material after water, it generates a huge amount of waste.

About 2~5% of the total amount of concrete is not used at the jobiste and comes back to the plant. We call it "returned concrete".

I don't know if there are similar words for example in the foods and beverage field (returned vegetables? returned drinks?), but we call it returned concrete.

Traditionally the RMC companies make it harden, then break it (during holidays) and then dispose it as industrial waste.

Even if it doesn't seem a dangerous material, concrete waste also contains sludge, in which there is a lot of exhavalent chromium. This makes it dangerous for the environment.

Until now I've always thought that we must learn from who came before us and keep doing things as they have always been done. But recently I think that we must do something to make our RMC field better. If we don't do something to improve it who will do it?

Not only in Japan, but in every Country (Korea, U.S.A.), every RMC plant worries about returned concrete. So, the best thing to do is collect opinions and work together to find the best solutions for this problem.

By doing so GNN has the purpose to finally eliminate the waste from RMC plants. That day is getting closer and closer.

Mitsuya Miyamoto (translated by Alberto Ferrari)


Change & cooperation

Also in anatomy the term "change" means something difficult.

In particular, if the same thing has been done for many years it is very hard to change habits in a short period. The same is for the cells of our body.

I think that anybody can find many excuses not to change. Mostly are due to external factors. For example "we don't have the necessary tools to do something", "our staff will not be happy to do it", "our president will not approve it".

Of course, the most comfortable thing that one human being can do is to remain in his warm bed and wake up late. But unfortunately we can't. We must work, to provide for our families and as time changes we also have to change and adapt. Same is for the RMC industry.

I've understood this in these last 10 years.

We have only 4 years left from the Olympic Games of 2020. In these 4 years the RMC industries can easily get a lot of jobsites, but the problem is what will be after 2020. And GNN is here to help any RMC company to succeed also after this big event.

One of the solutions that GNN can offer is represented by the IWA System, a project in which I deeply believe.



Mitsuya Miyamoto (translated by Alberto Ferrari)

Spread the unknown value of IWA

One of the biggest values of Nagaoka RMC is to deliver also small quantities, as 0,5 m3.

That is the smallest amount of concrete that a factory can supply, but one of the biggest in terms of problems. So many factories avoid to take some orders.

But we do, with pride, to make our customers happy.

We also give assistance to all our customers, by going to check the jobsite before the start of the works. It looks very disturbing to someone, but at the end of the day everybody is happy, as this helps to avoid later claims and to do a better a smoothier job.

Today we had a very good review from one of our customer that used our recycled concrete ECON.

It was very easy to used and place, as the setting was very fast and their work proceeded very fast too.

So (in winter time)  they could go home at about 5pm, instead waiting until 8pm or later as usual.

Very few cracks and cheaper than "normal" concrete.

All this means a happy customer and also a happy RMC factory. It is a win-win situation and the reason is simple. Go to meet the customers and create a good communication with them.

Unfortunately many RMC factories don't understand this and by doing so they lose many chances to grow and prosperate.

We as Nagaoka RMC will continue to do our best to make our customer happy!

Mitsuya Miyamoto (translated by Alberto Ferrari)


Dream, think positive, can do it! This is Menjo Kenzai

It is easy to understand by making a comparison with life insurances:

The effective ways to motivate can be divided in 2:

Create panic and realize dreams.

It is very easy to create panic, by just saying "if you don't do something now you will face serious problems later!".

Instead it is possible to say "please let us help you to have a better future and give us a chance!".

I will choose the second way.

For example, by relating these two ways to my job of thinking about possible solutions to solve the problem of concrete waste, I can state this:

By following the first method:

In the near future the won't be anymore space to throw away concrete waste.

Costs will get higher.

For a RMC plant it will get tougher to survive.

And this will be added to the problems that our society is facing, as population decrease and violence.

On the contrary, by following the second method:

Let's follow our dream of creating a better RMC world.

Let's solve the problems related to RMC waste as soon as possible.

Let's protect the environment.

As an expert in the RMC field I really will continue to do my best to make efforts in this direction. Of course not just by myself, but with the help of all our business partners.

I understand that sometimes it is very difficult and scary to make changes, as there are so many reasons to be scared and afraid. For example be afraid that our staff won't follow us, be afraid of becoming too busy or be afraid of not having the necessary machinery or tools.

But if we don't make changes nothing will change!

We as humans must be driven by our dreams and we must do our best to try to realize them.

This is the case of Menjo Kenzai (Aichi Prefecture):

They have been able to transform concrete related waste into a value, even without big funds or machinery. And every member of their staff is happy and smiling.


By following dreams, being positive and doing things everybody can reach his own happiness.

Mitsuya Miyamoto (translated by Alberto Ferrari)

The 3 biggest problems for a RMC factory

As a bar, a restaurant or a farm, also the RMC factories have to face the problems related to a lot of waste.

The waste produced by a RMC plant can be divided in 3 groups:

1) The unused concrete that comes back to the plant from the jobsite.

2) The small amount of dirty water that is generated by the concrete truck washing.

3) The sludge water containing also cement.

Everyday a lot of concrete waste are generated at the jobsite, as often there is a gap between the quantity needed and the quantity ordered. So the unused part must be taken back at the plant and then treated and disposed. This means big costs and big amount of extra work for the factory staff.

So, why not try to transform those waste into values??

Actually we are seeing a lot of attempts to try to solve this problem and this is a very good thing that we, as GNN, we will always try our best to support!



Mitsuya Miyamoto (translated by Alberto Ferrari)

The so called "change habit". Returned concrete fashion

These are some actions we repeat everyday:

Eat lunch.

Wake up in the morning.

Use our smart phone.

There are some actions that repeated everyday can generate something good or also something bad for us.

People in general have a lot of habits.

For example, if you eat a lot you will gain weight. Even by knowing this there is still people that eat a lot.

It is not something that affects just individuals, but also companies and businesses.

For example participate to conferences, that don't necessarily bring results.

Now we are in a transition stage at Nagaoka RMC.

We are becoming conscious of the meaning of change and habits.

6 years ago we met with Mapei S.p.A. and now, after working together, we are able to transform returned concrete into a value.

At that time I was extremely worried because I couldn't speak English properly.

But now I am not worried anymore.

In our field returned concrete related wastes have always been considered a big trouble. I think that worrying about something is like a fashion in a certain way. We're used to worry about it, so we don't think something different.

The change, instead, is something difficult to think about and to bring on. It could take months or even years. But then, when you think back, you laugh about the fact that you were worried about such small problems.


We are not worried about returned concrete anymore. We broke a habit, we've made a change!

Mitsuya Miyamoto (translated by Alberto Ferrari)

Once they become cakes we can't do anything

In everybody's imagination a cake is something sweet, good, with strawberries on it, that we eat at Christmas or at a birthday party. But for us, working in the concrete field, it is something we worry about.

It is called sludge cake.

The wastes related to concrete can be divided into 3 groups:

a) Unused/returned concrete.

b) Dirty water that remains in the RMC truck.

c) Sludge waters that are the result of the RMC truck washing.

The so called sludge waters contains cement, that cannot harden because the water is too much.

It is a "mix" very harmful for the environment, as it contains a lot of exhavalent chromium.

Once these cakes harden they must be thrown away (cannot be eaten!) at a very high cost:

1m3 --> 5000 yen.

If you think that 1m3 of concrete is sold at 13500 yen (in our area), it is very high!


So we had to find a solution... and we found it!

We are now able to treat those cakes before they harden, when the cement is still active. So, also these cakes, that before were just a waste, can be re-used into a new concrete, generating a profit.

Mitsuya Miyamoto (translated by Alberto Ferrari)

To break down the "boiling frog" habit

I suffer from gout.

Do I have a broken bone? This is what I thought as painful it was my right foot.

So I thought that my bad habits were slowly disintegrating my body. And this is when I decided to change them.

When we're used to do something we don't realize how dangerous it could be to proceed in one direction.

As you might know I'm engeged in the concrete industry.

Also in this industry we slowly get used to the problems we face daily. One of these is represented by concrete related waste, as the unused concrete that comes back from the jobsite to the plant.

The number of the places to dispose those wastes is getting smaller and so the related costs are getting higher. "The boiling frog".

But as we're used to this problem we might not realize it, until we'll face serious financial problems in our company.

The conclusion is that we've to recognize the problems and do everything we can to solve them.



Mitsuya Miyamoto (translated by Alberto Ferrari)

An overwhelming success

I've always thought that leaving something to other people is a great value and that by spreading this value the world would become a better place. So I'm doing efforts to spread it, not only at work, but also in every day life.

If I think that some ideas are valuable I always try to expand them and let them be known to my business partners. If, after my efforts to express these values, this or these persons don't understand it, I try to explain them that it is important for them to understand them. It is a help for them to succeed.

For me, one of the most valuable ideas is the so called IWA System. It allows to transform the RMC waste into a social and economic value.

We made this possible 6 years ago, together with Mapei S.p.A., an Italian admixture maker which is globally known and present in many countries.

After our latest meeting with Mapei I came to this conclusion: by conveying the values to others there is a limit to determine their change. We cannot force anyone to do something.

So, in some cases we can only work on something we think is valuable, to produce an evidence to those who don't believe in our values. To convince them with the evidence, with facts.

We believe in this system and we believe that we're having success with it.

As concrete is the second most used material after water, the waste related to it are a huge amount. And it is huge their load on the environment. But I repeat, we believe to have the right solution to this problem.

Fortunately we're surrounded by many positive business partners and with their help I believe we can make the world a better place to live in.

Mitsuya Miyamoto (translated by Alberto Ferrari)


No more waste!

About 2 months ago (April the 2nd) I celebrated the 15th anniversary since I've entered the RMC world.

15 years ago we all were very worried about the wastes related to the RMC: returned/unused concrete and sludge.

Now, after 15 years, I can say that we solved the problem and that those wastes became a value for us. It has became a new era and the change is very big.


It is a huge step for our industry and a positive change in terms of environmental care, but also from a business point of view, as the wastes are recycled and can be re-used and re-sold as a new product.

Mitsuya Miyamoto (translated by Alberto Ferrari)

Points in common with Japanese Sake'

This article is about the time when I met Mr. Sakurai, President of Asahishuzo, famous for its Dassai sake'.

That was a part of my study tour about management related to the "Future Management" lessons of Mr. Takaharu Yasumoto.

While I was getting a kind explanation about their production plant I was surprised by one thing in particular:


These are pictures taken from Google and they show the sake lees generated by sake's production.

Simply speaking they are the wastes that come from the production.

The same thing happens in the RMC production plant, where the waste is called sludge.

In the RMC plant, at the end of the working day, the concrete trucks are washed by the operators. If that RMC wastes inside the trucks are left there as they are, they harden. That's why they have to wash the inside of the trucks very well.

The sludge waters then, are sent to a filter press, where they're filtered and compressed, generating something similar to the sake lees, that we can call "RMC lees".


Compared to sake lees, their amount is huge! And huge is also the fee that the RMC plants have to pay for the disposal.

So, at Nagaoka RMC we invented a system to recycle all those wastes:

Once the wastes come back at the plant, they're treated with our (so called) IWA System and the material we obtain can be reused as new aggregates (to make new concrete or as road sub-base).

It took about 5 years but, also with the help of other GNN members and Mapei, we've been able to achieve this result.


Mitsuya Miyamoto (translated by Alberto Ferrari)


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First 2016 International edition of our NR Times

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Please check the 2nd edition of our NRTimes International below:

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Please check the new edition of NR Times below, to find some interesting news from Nagaoka RMC and the Izu Peninsula!

NR Times International Vol. 1

NR Times International Vol. 1

GNN at the RMCAS workshop in Singapore Jan.16 2015


Last week me (Alberto Ferrari) and Mitsuya Miyamoto from Nagaoka RMC, GNN founder and member, joined the RMCAS workshop at the Goodwood Park Hotel in Singapore. The main theme was the concrete sustainability. Many persons in the field talks about it but very few of them really do something to change the way of producing and discharging concrete. We and a very few other companies in Japan (Shiraishi Kensetsu, Mitsuwa RMC, Nomura MaPro and a few others) are actually using a very innovative product produced by Mapei S.p.A. in Italy. Its name is Re-Con Zero and it allows to transform unused (at the jobsite) and returned (at the plant) concrete into RCAs that can then be re-used to produce non-structural concrete. We went to give our example to the Singaporean RMC related people and we hope that our small contribute can help the RMC world to become a little more conscious about itself's commitments to the society and nature.

Mr. Stanley from Unibeton (also testing RCZ in the UAE) made a detailed presentation about the  IBB probe system, that we're also using here in Japan.

We'll be again in Singapore in August this year (26~28) to attend the "40th our world in concrete & structures" as GNN. Please feel free to join us!


GNN's simple technical dictionary


Please take a look at this simple dictionary we made and feel free to use it!


11th GNN Conference in Tokyo

"GNN is here to create a new tomorrow"

On November 15th don't miss the live event in Tokyo! As usual there will be many interesting presentations from foreign and Japanese Companies. As there will be at least 350 partecipants we suggest you to come to the Conference Hall ( Architectural Institute of Japan, 26-20 Shiba 5 chome, Minato-ku, Tokyo) on time. Doors will open at 9am, while the Conference will start at 10am.

GNN is here to create a new tomorrow (Tokyo Conference 2014).pdf