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Scientists Discover Secrets of Ancient Roman Concrete at Pompeii

Archaeologists and MIT researchers uncovered ancient Roman hot-mixed concrete with self-healing properties, challenging Vitruvius's method and informing sustainable modern concrete design.

  • Dec 9: Scientists excavating Pompeii discovered a construction site frozen by Mount Vesuvius in AD 79 with premixed dry material piles and tools left in place, clarifying Roman self-healing concrete methods.
  • Following recent digs, researchers showed recent excavations provided fresh samples that contradict Vitruvius's slaked-lime account, settling debates about Roman concreting methods.
  • Chemical and isotope analyses showed Raman spectroscopy and isotope analysis of five pre-mixed dry piles found pozzolan, quicklime, and lime clasts consistent with hot mixing.
  • Modern Portland cement accounts for about 8% of global CO2, and researchers say the discovery could inform more durable, sustainable concretes for next-generation low-carbon concretes.
  • However, researchers caution the sampled wall might not represent all Roman structures, while lime clasts act as calcium reservoirs that chemically heal cracks.
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Scientists excavating in the Roman city of Pompeii have discovered a site where concrete was being made. The materials they found there confirm a theory, only a few years old, about how this exceptionally strong concrete was made. The journal Nature Communications reports that archaeologists excavating in Pompeii stumbled upon a construction site that was buried under a torrent of ash and stone during the eruption of Mount Vesuvius in 79 AD. Too…

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Scientific American broke the news in on Tuesday, December 9, 2025.
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