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Roman concrete.

Brian Roemmele

427,085 subscribers

12,490 次观看 • 7 个月前 •via X (Twitter)

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5. Its longevity owes much to Roman concrete. This concrete contains calcium carbonate lumps called "lime clasts," once thought to be from poor mixing. Now, they’re known to provide "self-healing" by dissolving in water that seeps into cracks and recrystallizing to seal them.

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