#positive #futureTechRecycled concrete and CO2 from the air are made into a new building material -- ScienceDailyhttps://www.sciencedaily.com/releases/2021/10/211007122058.htmA new way to reduce emissions levels caused by concrete use has been proposed and proven to work by Professor Ippei Maruyama and C4S (Calcium Carbonate Circulation System for Construction) project manager Professor Takafumi Noguchi, both from the Department of Architecture at the University of Tokyo. They have found a way to take waste concrete and captured carbon dioxide, and combine them in a novel process into a usable form of concrete called calcium carbonate concrete.
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"Our concept is to acquire calcium from discarded concrete, which is otherwise going to waste," said Maruyama. "We combine this with carbon dioxide from industrial exhaust or even from the air. And we do this at much lower temperatures than those used to extract calcium from limestone at present."