Opus caementicium uncovered inside of a characteristic Roman arch. In contrast to modern-day concrete buildings, the concrete used in Roman properties was typically included with brick or stone. The Romans employed concrete thoroughly from 300 BC to AD 476.[eighteen] In the course of the Roman Empire, Roman concrete (or opus https://preecha-concrete-pile60482.blogstival.com/57458675/the-smart-trick-of-concrete-reinforced-with-bamboo-that-nobody-is-discussing