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Carbonation of calcium silicates

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Technology Description

Cements based on carbonation of calcium silicates can sequester CO2 as they cure. Therefore, even if they are based on similar raw materials to PC clinker, these types of cement can yield zero process CO2 emissions in net terms, as the emissions would essentially be re-absorbed during the curing process. As alternative binding materials, they would have a different chemical composition to Ordinary Portland Cement.

Relevance for Net Zero

Carbonation of calcium silicates reduces emissions from cement production by 30-40%, and further reduces emissions by sequestering CO2 as it cures, leading to about 70% reduction in emissions in net terms. However, its application will likely be limited to pre-cast applications since it requires a CO2-rich atmosphere for curing.

Key Countries

United States

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