Holcim and CWG Develop Net-Zero Concrete Using Biochar and Coffee Grounds
Holcim and CWG have developed a low-carbon concrete utilizing biochar from spent coffee grounds, aiming for market adoption by enhancing construction decarbonization. Initial trials, conducted in April and September 2025, demonstrated significant reductions in Global Warming Potential, achieving a projected net-zero concrete solution.
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Holcim and CWG have pioneered a pathway to net-zero concrete by integrating biochar made from spent coffee grounds and coppiced wood. This initiative involves industry collaborators, including O'Halloran & O'Brien and engineering firms like Arup and Ramboll.
Two significant pours were conducted in April and September 2025 at CWG's Wood Wharf and Bank Street sites. The innovative concrete mix achieved an 80% reduction in net Global Warming Potential in initial tests, with further optimization resulting in a net GWP of -14 kgCO2e/m, marking the first instance of net-zero concrete for Holcim. The carbon captured from plants is stored within the concrete, promoting sustainability.
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