Opus caementicium exposed inside of a characteristic Roman arch. In distinction to modern day concrete structures, the concrete Utilized in Roman properties was commonly coated with brick or stone. The Romans made use of concrete extensively from 300 BC to AD 476.[eighteen] Throughout the Roman Empire, Roman concrete (or opus https://waylonn8sqn.topbloghub.com/42153132/examine-this-report-on-concrete-reinforced-wall