July 30, 2024

Applying concrete sludge to “CARBOCATCHTM” technology, and verifying to build a low
carbon pavement〜Development of a portable system named “CARBOCATCHTMMOBILE” to achieve
diverse applications of this technology〜
Taiheiyo Cement Corporation (Headquarters: Bunkyo-ku, Tokyo; President: Yoshifumi Taura)
developed “CARBOCATCHTM” that efficiently enabled to absorb carbon dioxide (CO2) into
cement slurry in 2023.
“CARBOCATCHTMMOBILE” is a new portable system designed to verify products utilizing
CARBOCATCHTM slurry technology. Currently, verification testing has been conducted on low
carbon concrete pavement. The new system was installed at a ready-mix concrete plant, and waste
concrete sludge from the plant was used as a raw material for the slurry.
CARBOCATCHTM is capable of absorbing CO2 not only into cement slurry but also into waste slurry containing
calcium, such as concrete sludge or precast concrete listing. Concrete sludge, in particular, is a significant concern,with approximately 3 million tons wasted annually in Japan. Its handling and effective utilization are the big issueof our field. On the other hand, this technology can be applied to waste materials, enhancing the effective usage ofresources, and enabling the development of further low-carbon material.
CARBOCATCHTMMOBILE is a portable system used to apply CARBOCATCHTM technology. This system iscomprised of 3 devices: mixing device, CO2 absorbing device, and pump device. Each device can be loaded onto
trucks using forklifts and delivered to concrete production sites. Slurry that is absorbing CO2 (i.e.,
CARBOCATCHTM slurry) is produced using the mixing device and CO2 absorbing device. ProducedCARBOCATCHTM slurry can be transported to concrete mixers at ready-mix concrete plants by using the mixing
device and pump device.
The operation of CARBOCATCHTMMOBILE was verified at the headquarter plant of Tohoku Taiheiyo ReadyMix Concrete. CARBOCATCHTMMOBILE was installed in the plant, and CARBOCATCH slurry was produced
by absorbing CO2 into a waste concrete sludge cake from the plant. Additionally, used CO2 was separated andrecovered from exhaust gas at Kumagaya plant; one of our cement plants. The amount of CO2 absorbed in 1 ton ofsolid of concrete sludge was 208 kg※2. CO2 emission intensity of solid from the produced CARBOCATCHTM
slurry was estimated as -178kg/t※3 under an assumption that CO2 emission intensity of waste concrete sludge was0 kg/t.
This CARBOCATCHTM slurry and its dried powder were used as raw materials to produce pavement concreteand soil stabilizing cement. Moreover, by using waste concrete that absorbed CO2 as a part of the base course
materials, all components; roadbed, base course, and pavement, were built using low carbon materials. Pavement
concrete was produced at the ready-mix concrete plant, and the test construction was conducted at our Sendai
service station without any trouble. No cracks were observed in the field survey after 2 months’ service, and goodpavement condition was confirmed. CO2 emission intensity per square meter of this test construction derived fromraw materials was estimated as a 15% decrease compared to that of conventional pavement concrete construction.
It was confirmed that concrete sludge can be improved by our original CO2 absorbing technology, as well as,
both circular economy and decarbonization can be achieved at the same time through this test. Additionally,making
Note : T his document has been translated from the Ja panese original for r efer ence purposes only. In the event of any
disc repa nc y between this translated d oc ument and the Japa nese or ig ina l, the or ig ina l shal l pr ev ail .

CARBOCATCHTM technology portable enables it to be applied at other concrete production sites. We willcontinue to apply this technology to various applications and work towards operationalizing it to contribute to theestablishment of a carbon neutral society.
※1：CARBOCATCH is a trademark by Taiheiyo Cement Corporation.
※2：Estimated from the result of weight loss (amount of decarboxylation) using thermogravimetric analysis(TGDTA).
※3：CO2 emission of CO2 separation and recovering processes in the cement plant and production process ofCARBOCATCH slurry is not counted.
【Reference; previous news release】
Successful Development of Manufacturing System “CARBOCATCHTM” to Fix CO2 into Fresh Concrete (March15, 2023)
https://www.taiheiyo-cement.co.jp/english/summary/pdf/230315_2.pdf
Ordinary concrete

WaterConcrete with CO2
CARBOCATCH
fixed by using
Waterslurry
CARBOCATCHTM slurry

CementAggregates

CementAggregates

Figure 1. Schematic of concrete mix design using CARBOCATCHTM slurry
CO2 absorbing device

Mixing device

Pump device

Figure 2. Overview of CARBOCATCHTMMOBILE (left) and its installation (right)✓CARBOCATCHTM slurry is produced using mixing device and CO2 absorbing device.
✓CARBOCATCHTM slurry is transported to concrete mixers of ready mix concrete plants by using mixing device andpump device.
✓Each device can be loaded onto trucks, and delivered to concrete production sites.

Figure 3. Situations of construction and service of pavement concrete using CARBOCATCHTM slurry.

< For inquiries related to this release >Taiheiyo Cement Corporation
Investor Relations & Corporate Communications Group
General Affairs Department
E-mail．ir-com@taiheiyo-cement.co.jp