Two tech companies just demonstrated that it’s possible to store CO2 in concrete.
in the Bay Area, they demonstrated this can be done by injecting CO2 into a freshly poured batch of concrete, a first for the industry, they said.
“In the broader carbon-removal ecosystem, this is meaningful,” said Anu Khan, an expert at the environmental group Carbon180. Finding permanent storage for captured carbon carbon, she added, is “a major bottleneck.”The firms’ process starts with a bunch of rocks in a warehouse outside San Francisco.Stacks of trays at Heirloom’s headquarters in Brisbane, Calif., hold crushed limestone. The rocks have been treated to starve them of carbon.
Last week, Heirloom trucked canisters of carbon dioxide directly captured from the air to a plant in San Jose run by Central Concrete.injected that CO2 into recycled water, which was used to make fresh concrete. According to CarbonCure, when carbon binds with the rest of the material, it makes the concrete stronger. And without concrete acting as a vault, carbon captured from the air needs to be stored underground in“Could you store all the carbon that we need to capture by putting it in concrete? No, you couldn’t,” said Eric Toone, a technical lead at Breakthrough Energy Ventures, which has also invested in both Heirloom and CarbonCure.
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