Carbon-negative concrete is a type of concrete that incorporates captured carbon dioxide (CO2) to form calcium carbonate through mineralization processes.
Addressing climate change by reducing CO2 emissions and sequestering carbon dioxide while improving structural properties of traditional concrete.
During production, CO2 is injected into the concrete mix. The CO2 reacts with the cement paste and other minerals in the mixture, forming stable calcium carbonate structures which permanently trap the CO2 within the concrete matrix. This process not only reduces atmospheric CO2 levels but also enhances the compressive strength of the resulting material.
The manufacturing process involves capturing CO2 from industrial sources or direct air capture, then injecting it into a concrete mixture. This requires specialized equipment for CO2 injection and handling, as well as additional steps in the curing process to ensure complete mineralization.
Similar to conventional concrete, but with an added step of CO2 injection during mixing. The concrete is then cured under controlled conditions to allow for full mineralization of the incorporated CO2.
Field units draw low hundreds of watts; fabrication is energy-intensive due to vacuum baking (high kWh per ton).
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