What is climate-positive concrete?
Climate-positive concrete refers to building materials that actively absorb and permanently lock away more carbon dioxide than was emitted during their production, effectively turning structures into carbon sinks [1]. This is achieved through novel binders and accelerated carbon mineralization techniques, such as injecting captured carbon dioxide into fresh concrete during mixing or using magnesium-rich mineral feedstocks like magnesium silicates that chemically bind the gas into stable carbonate minerals [2][3].
Pilot initiatives, such as load-bearing structural elements being tested in Karlsruhe, Germany, demonstrate that these mineral-bound matrices maintain structural integrity while storing carbon [4]. However, scaling these technologies introduces key hurdles, including managing energy consumption, higher costs, fitting into existing supply chains and building codes, and ensuring long-term durability without sacrificing strength [5][6][7].
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