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Previous research has already found that Roman concrete was far superior to our own modern concrete, which is made to endure about 120 years.

It’s been known for a while that the volcanic sand used in Roman concrete and mortar made their buildings last for so long. Now a new study by a group of engineers and engineering researchers has discovered the precise recipe that made the Roman concrete endure much longer than concrete used today.

The researchers used an ancient recipe written down by Roman architect Vitruvius to mix a batch of mortar. The engineers let it harden for six months and looked at it with microscopes. They found that clusters of a dense mineral form through the Roman process. These strätlingite crystals, formed by the volcanic sand as it binds with limestone, prevented the spread of cracks by reinforcing interfacial zones. Interfacial zones are weak links inside the concrete...

Researchers discover secret recipe of Roman concrete that allowed it to endure for over 2,000 years | Ancient Origins

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