Technology development company C-Crete Technologies has debuted its cement-free concrete in a commercial building project in Seattle, US.

The environmentally friendly alternative to conventional Portland cement claims to emit close to zero CO₂ during its manufacture and can also absorb CO₂ from the atmosphere over time.

An estimated one tonne of CO₂ emissions will be avoided for every tonne of C-Crete’s binder that substitutes Portland cement.

Additionally, the product is made using a range of natural minerals and industrial by-products, assuring a sufficient feedstock.

Approximately 60t of this cement-free concrete was used in the foundations and shear walls of the 7200 Woodlawn project in Seattle, a redevelopment of a 120-year-old historic brick structure using concrete as part of a seismic retrofit.

The concrete has a loading strength of roughly 5,000psi², more than the ASTM standard of approximately 4,000psi for most residential, commercial, and infrastructure concrete applications.

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It also meets other significant industry standards with its durability and can be used alongside conventional concrete admixtures, enabling easy integration into existing construction methods.

C-Crete founder and president Rouzbeh Savary said: “We are thrilled to introduce our cement-free concrete, a game-changer in sustainable construction.

“Our binder is a drop-in replacement for Portland cement that drastically reduces carbon emissions. Given that our product meets industry standards and has cost-parity with conventional concrete, it opens up an entirely new era in construction.”

German-based building materials company Heidelberg Materials delivered the cement-free concrete for the Seattle project.