Green concrete can’t store the billions of tons of carbon needed to meet the world’s climate goals, but it offers an immediate, partial solution to the problem of concrete emissions until other options emerge. Amazon used green concrete for its Arlington headquarters and invested directly in CarbonCure Technologies, a startup that manages carbon injection for concrete plants. To make green concrete, liquid CO2 is sprayed inside the mixing drums on concrete trucks. Vulcan uses carbon injections at more than 20 of its roughly 140 concrete facilities in the U.S., producing more than 1 million cubic yards of green concrete last year, or nearly 10% of its total concrete shipments. At the concrete plant, the liquid carbon dioxide snakes through a hose across a 50-foot-tall tower where the concrete materials are dumped into the mixing trucks.

Source: Wall Street Journal November 02, 2023 17:00 UTC