An international group of scientists recently found that the key to the strength of ancient Roman concrete is the presence of aluminous tobermorite, a mineral that slowly forms within voids and prevents cracks from traversing through the concrete.
Read MoreThe latest research to shed light on the ductility and durability of ancient concrete comes from geophysicists at the Stanford University, who discovered concrete-like rock deep within a dormant volcano in Italy they say could explain how ancient Romans invented the compound used to build structures like the Pantheon and Colosseum.
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