The Origins Of The Computer

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concrete was a fluid mixture of lime and small stones poured into
the hollow centers of walls faced with brick or stone and over curved wooden
molds, or forms, to span spaces as vaults. The Mediterranean is an active
volcanic region, and a spongy, light, tightly adhering stone called pozzolana
was used to produce a concrete that was both light and extremely strong.

The Romans had developed potsalana concrete about 100 B.C. but at first
used it only for terrace walls and foundations. It apparently was emperor Nero
who first used the material on a grand scale to rebuild a region of the city of
Rome around his palace, the expansive Domus Aurea, after the great fire of AD 64
which he said to have set. Here broad streets, regular blocks of masonry
apartment houses, and continuous colonnaded porticoes were erected according to
a single plan and partially at state expense. The Domus Aurea itself was a
labyrinth of concrete vaulted rooms, many in complex geometric forms. An
extensive ...

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