Submitted by PoorIsTheNewSwag t3_1262kes in science
AllanfromWales1 t1_jeajk7l wrote
Reply to comment by NevyTheChemist in New additives could turn concrete into an effective carbon sink by PoorIsTheNewSwag
Nothing that I read offered a solution. They implied that pre-carbonating gets over the problem of cracking of the concrete as it carbonates, but that isn't a serious issue. Corrosion of reinforcing steel can and does occur in uncracked concrete if the pH is not kept alkaline. The permeability of the concrete to air is ample to allow this. Subsequently cracking occurs because the corrosion products have a higher volume than the steel they replace. The cracking is a result of the corrosion, not the cause of it.
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