How is Roman concrete still standing after 2,000 years?
undefined 21, 2025
Roman concrete has lasted over 2,000 years thanks to volcanic ash (pozzolan) and chunks of quicklime (lime clasts) that give it self-healing powers. When water enters cracks, it triggers a chemical reaction that fills them with calcite. Unlike modern concrete, which breaks down in 100 years, Roman structures like the Pantheon still stand strong—thanks to smarter, hotter mixing methods we’re only now starting to understand.
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