Clay to decarbonize concrete

Decarbonated clay concrete has been used for the first time on a construction site. Focus on this innovation developed by a partnership between CHRYSO and two leading concrete companies.

L’argile pour décarboner le béton

After two years’ work, CHRYSO's Research & Development teams, in collaboration with their counterparts from Bouygues Construction and Hoffmann Green Cement Technologies, have developed a decarbonated clay concrete.

It is based on an H-EVA cement (patented by Hoffmann Green Cement Technologies), which does not contain a gram of clinker. Clinker is a mixture of limestone and silicates that requires firing at more than 1,400 °C, and is therefore responsible for high greenhouse gas emissions from cement, and therefore from concrete. Without clinker, the carbon footprint of this cement is divided by four compared to its conventional equivalent.

The cement comes in the form of a powder, which can be stored in a silo, and looks very much like sand. Clay, at the heart of H-EVA technology, is a material available everywhere in large quantities and can be used for this application thanks to a very specific additive. Its solid technical performance means that it can be used for all types of concrete applications, both in buildings and on roads.

Today this partnership is stepping up with a first successful application on a building site, which opens the way to future achievements with H-EVA 0% clinker concrete.

The CHRYSO®EnviroMix range of admixtures, and in particular Ultra Low Carbon, has been developed to meet the requirements of low or very low carbon concrete and reflects CHRYSO's commitment to assisting its partners in reducing the carbon footprint of their business.