In February, Central Concrete, a subsidiary of Vulcan Materials Company, and carbon-removal firms Heirloom Carbon and CarbonCure, achieved an industry first: permanently trapping carbon dioxide from direct air capture in concrete using reclaimed-water technology.
How they did it: The firms took carbon dioxide captured from the air by Heirloom’s technology to a Central Concrete plant, and in a process developed by the Nova Scotia–headquartered CarbonCure, injected it into water that had been used to wash out concrete trucks. That water was then used to make new concrete.
- “Carbon dioxide reacts with calcium ions in the cement mix and turns into limestone—calcium carbonate,” said Alana Guzzetta, manager of Vulcan Materials Company’s National Research Laboratory in San Jose, California. “Once it’s there, it is very stable and stays as that limestone throughout the life of the concrete, even after demolition.”
Why it’s important: “Concrete is the most-used manmade material in the world,” Guzzetta said. “One reason is its versatility. We can take the same core ingredients and get a variety of capabilities and any shape. That’s where the topic of reducing embodied carbon [the greenhouse gases emitted during manufacturing and construction] becomes a big one.”
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