Opus caementicium exposed in a attribute Roman arch. In distinction to contemporary concrete constructions, the concrete Employed in Roman buildings was usually protected with brick or stone. The Romans utilized concrete thoroughly from three hundred BC to AD 476.[18] In the Roman Empire, Roman concrete (or opus caementicium) was constructed https://wordpresswebsiteservices27159.shotblogs.com/the-best-side-of-concrete-reinforced-beam-49755030