Algae-grown limestone could be the key to ‘carbon negative’ cement production
Limestone, the key ingredient in portland cement, could be created using a process similar to coral reef formation
By using biogenic limestone instead of quarried limestone as the filler, the cement mixture as a whole could even be considered to be ‘carbon negative’. Not only would production of the cement have a neutral effect on atmospheric CO2, the filler would actually store away CO2 extracted by the algae.
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