MIT and Harvard researchers find secret to "self-healing" Roman concrete
Briefly

Researchers from MIT and Harvard claim to have solved the mystery behind the durability of ancient Rome's concrete structures, and are now aiming to bring a modern version of the recipe to the market.The research team found the ancient Romans made their concrete with quicklime, which is lime in its pure state, rather than the more typical slaked lime, and that this gave it "self-healing" properties.
Read at Dezeen
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