The Romans used concrete for building the Colosseum and making aqueducts and other buildings. Concrete also enabled the Romans to expand their architectural designs into the dome and into multi storied buildings with different weights of concrete as needed. In the Pantheon, there were at least three different weights of concrete used for stability.
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Concrete was used by the Romans for the foundations of large buildings, such as the Colosseum, bridges and temples. By using concrete they were able to make use of the dome, such as in the Pantheon and in the rotating room of Nero's Golden House. The foundations of the above ground aqueducts were mostly set in concrete.
Ancient Romans did not use gunpowder. Gunpowder was invented by China around the middle ages.
No the Romans did not invent paper the Chinese invented paper.
Nup.
Lead water pipes.
The Romans used large, thick gold coins. Each coin was called an aureus.