Euh, you are still making cement by cooking off CO2. Limestone or old cement that has reabsorbed CO2, in both cases you need to remove CO2 from caco3. So it is not zero carbon. As they don’t provide numbers … Nor academic paper … Sigh. Cement cures by absorbing CO2.
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Euh, you are still making cement by cooking off CO2. Limestone or old cement that has reabsorbed CO2, in both cases you need to remove CO2 from caco3. So it is not zero carbon. As they don’t provide numbers … Nor academic paper … Sigh. Cement cures by absorbing CO2.