Opus caementicium uncovered in the characteristic Roman arch. In distinction to contemporary concrete buildings, the concrete used in Roman structures was normally coated with brick or stone. The Romans made use of concrete thoroughly from 300 BC to Advert 476.[18] Over the Roman Empire, Roman concrete (or opus caementicium) was https://7bookmarks.com/story19639621/not-known-details-about-concrete-reinforced-house