Opus signinum

Opus signinum is a building material used in ancient Rome. It is a form of Roman concrete, the main difference being the addition of small pieces of broken pot, including amphorae, tiles or brick, instead of other aggregates.

Its main advantage over opus caementicium was that it is waterproof, the reason for its widespread use in Roman baths, aqueducts, cisterns and any buildings involving water.
In floors it provided damp-proofing.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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