The ancient Romans used burnt lime (calcium oxide) and volcanic ash (silica and alumina) to produce cement for construction. The Colosseum and Pantheon, two of the many Roman structures constructed with this ancient type of cement, have stood the test of time and weather.

The Colosseum (source:
The Colosseum (source: Antiquity)
The Pantheon (source:
The Pantheon (source: The Pantheon in Rome –

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