Bet most of you never really thought about this. But since Portland cement (i.e., concrete) is responsible for about 8% of our CO2 emissions- and often needs repair, it’s been on my horizon, even if it’s not one of my primary interests. Especially since we produce about 12 billion tons of concrete (which yields 12 metric tons of carbon dioxide) a year. And, while we consider concrete to be a solid mass, it’s really pretty porous (consider a bunch of small balls packed together, with voids between the balls, akin to a dry sponge. And, when rain or snow slips among the voids0 and then freezes- kerplow, the concrete splits apart.
Continue reading Self-Healing Concrete
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