> CarbonCure, a start-up based in Canada, has developed an add-on machine that injects CO2 at the point of mixing the cement with water and sand to create concr

> CarbonCure, a start-up based in Canada, has developed an add-on machine that injects CO2 at the point of mixing the cement with water and sand to create concrete. This permanently stores the CO2 and makes the concrete stronger. I'm very sceptical of this. If you add CO2 to concrete, the extra strength comes from calcium carbonate, which accelerates concrete aging, and generally reduces its useful life. It's never a good thing. I readup on what they do, and there is nowhere this is addressed. Their official stance (https://www.carboncure.com/concrete-corner/key-differences-between-weathering-carbonation-and-carboncure/ https://www.carboncure.com/concrete-corner/key-differences-b...) simply restates the facts without addressing the ultimate fact that this concrete will have much lesser pH reserve for the corrosion to eat through, more porosity, and that this will reduce its useful life in the end no matter what.