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However, concrete very slowly absorbs the CO2 back from the air, becoming limestone. I know this takes very long for thick structures, on the order of centurie
by Tuna-Fish 7y ago
However, concrete very slowly absorbs the CO2 back from the air, becoming limestone.
I know this takes very long for thick structures, on the order of centuries. Does anyone have a good idea of just how long?
Anyway, if a cement plant starts capturing the CO2 released during production and disposing of it somewhere other than the atmosphere, it would become a CO2 sink as the cement would slowly consume CO2 as it cures.
- the8472 7y agoCalcining will release CO2 from the lime plus CO2 from the fuel to heat it. Only the former will be reabsorbed over time. And if the timescales are long enough the absorbtion still wouldn't bring you to net-zero because during the time the CO2 in the atmosphere it participated in positive feedback loops.
- dillonmckay 7y agoIn addition to the CO2 generated during production, there is also CO2 emissions from both the transport of the raw material inputs and the finished product to its point-of-use. I have no idea how that compares to actual production emissions, though.