Aha Lantern: roman concrete self healing
Full story with sources: https://ahalantern.blogspot.com/2026/10/how-roman-inspired-concrete-can-heal.html
Roman concrete self-healing, explained: Roman harbors spent 2,000 years in the ocean and came out stronger. Our concrete cracks in decades. In 2023, scientists finally uncovered why it lasts - and the wall that heals its own wounds.
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A correction on one line: the Romans' concrete recipe did not actually vanish - ancient writers like Vitruvius recorded concrete recipes, and volcanic ash was a known ingredient. What stayed hidden for two thousand years was WHY it lasts: in 2023, MIT researchers showed that hot-mixed lime clasts let the concrete heal its own cracks - in lab tests, deliberately cracked samples sealed themselves within two weeks. Source: MIT News; Seymour et al., Science Advances (2023) (checked 2026-10-18).
Series: Built to Last
