Moreover +MartinJJ NoAgenda
, the Portland Cement chemical process used in building, releases C02 into the atmosphere as it cures
Strangely enough, the slacked lime cement mixtures used before that actually absorb CO2 in the curing process. Moreover, as the cement cracks and the bricks move over time, the lime cement actually self repairs drawing in more CO2. You are just limited to 3 or 4 stories.
Found out all that as I'm renovating our old 1920's corner shop/ residence. I have to use a 60% lime 40% Portland cement mix with a lot of sand 6:1 as the bricks are too soft to use modern materials.