Opus caementicium uncovered in the characteristic Roman arch. In distinction to contemporary concrete constructions, the concrete used in Roman structures was ordinarily coated with brick or stone. The Romans made use of concrete extensively from 300 BC to AD 476.[eighteen] In the Roman Empire, Roman concrete (or opus caementicium) was https://martincdxur.blogunok.com/35945592/concrete-reinforced-wall-an-overview