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Concept

opus caementicium

A classical structure with columns and a triangular pediment stands in a dimly lit space, symbolizing the architectural achievements of opus caementicium, the Roman concrete used in monumental buildings like the Pantheon and Colosseum.

The Latin name for Roman concrete, the structural material that made the Pantheon, the Colosseum vaults, and the great imperial baths possible. It combined lime mortar with chunks of stone aggregate (caementa) and volcanic ash. Poured rather than laid, it freed Roman builders from the geometric limits of cut-stone masonry and enabled the domes and curved vaults that defined the architecture of the empire.

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