Opus caementicium uncovered inside of a characteristic Roman arch. In contrast to present day concrete constructions, the concrete used in Roman structures was normally lined with brick or stone. The Romans used concrete thoroughly from 300 BC to AD 476.[eighteen] Throughout the Roman Empire, Roman concrete (or opus caementicium) was https://raymondlbzvq.vblogetin.com/41596459/getting-my-concrete-reinforced-wire-to-work