Opus caementicium exposed inside a characteristic Roman arch. In distinction to modern concrete structures, the concrete Utilized in Roman properties was generally included with brick or stone. The Romans used concrete thoroughly from 300 BC to AD 476.[18] Over the Roman Empire, Roman concrete (or opus caementicium) was produced from https://highkeysocial.com/story5297466/5-simple-statements-about-concrete-reinforced-stone-explained