Opus caementicium uncovered within a characteristic Roman arch. In distinction to present day concrete structures, the concrete used in Roman properties was typically covered with brick or stone. The Romans utilised concrete extensively from three hundred BC to Advert 476.[eighteen] During the Roman Empire, Roman concrete (or opus caementicium) was https://mixedmartialarts60593.dailyhitblog.com/41227812/the-concrete-reinforced-steel-diaries