Opus caementicium exposed in a attribute Roman arch. In distinction to fashionable concrete constructions, the concrete used in Roman structures was usually protected with brick or stone. The Romans employed concrete thoroughly from three hundred BC to AD 476.[18] In the Roman Empire, Roman concrete (or opus caementicium) was made https://taifudo-bodyguard83726.blogrelation.com/42110550/getting-my-concrete-reinforced-wire-to-work