Carbon negative concrete "CO2 SUICOM"

Mitsubishi Corporation

Outline

Mitsubishi Corporation will support the business development and marketing of CO2-abosorbed concrete “CO2-SUICOM”, invented and developed by Kajima Corporation, The Chugoku Electric Power Company, Denka Company and Landes Corporation. This eco-friendly concrete can absorb CO2 from various sources such as steel plants, power plants and cement plants by using special admixtures and adopting special CO2 curing methods. In addition, by actively using materials with low CO2 emissions, such as coal ash and blast furnace slag, CO2-SUICOM can even achieve carbon negative.
Mitsubishi Corporation will support the business development and global marketing of CO2-SUICOM and CO2 sequestrated aggregate, in order to address the environmental issues and provide support towards a de-carbonized society.

Description

【CO2-absorbed concrete】
The special admixture used in CO2-SUICOM, absorbs CO2 and solidifies by a calcium carbonation process. This significantly reduces the amount of cement and accelerates the absorption of CO2 inside the concrete. In terms of the manufacturing process, the formed concrete is placed in a curing chamber, and CO2 is fed into the curing chamber to be absorbed into the concrete. CO2 from various sources, including steel plants, power plants and cement plants could be used directly. Ordinary concrete blocks emit around 300 kg of CO2 from materials per 1m3. However, CO2-SUICOM can achieve carbon negative by actively using coal ash, blast furnace slag, and other industrial by-products with low CO2 emissions, combined with CO2 absorption from the use of special admixture and the special curing process. The absorbed CO2 is fixed inside the concrete, and will not be released.
The strength of CO2-SUICOM is equivalent to that of an ordinary concrete product. In addition, it has excellent abrasion resistance, little efflorescence, and it makes plants easier to grow due to its chemically neutral condition.
At present, the main products are precast concrete products such as road blocks and pavement blocks produced in factories. Various products are already in use for both public and private construction.
As one of the carbon recycling technologies which can contribute to the realization of a decarbonized society, Mitsubishi Corporation will support technological demonstration, commercialization and marketing of the technologies.

Partner(s)

【CO2-absorbed concrete】
Kajima Corporation: Product development and design
The Chugoku Electric Power Company: Production demonstration test (thermal power plant)
Denka Corporation: Development of special admixture
Landes Corporation: Manufacture and sale of precast products
Mitsubishi Corporation: Business development and global marketing