Lime
An industrial material referring to calcium oxide (quicklime), produced by burning limestone, and calcium hydroxide (slaked lime) made by adding water to it. It is used in mortar and cement, soil conditioning and disinfection.
Ancient Roman concrete lasts 2,000 years by healing itself. In 2023 MIT found the lime specks in it were deliberate, not careless. When water enters a crack, the lime dissolves into calcium that reacts with CO2, sealing it as Calcium carbonate.
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