Opus caementicium uncovered inside a characteristic Roman arch. In distinction to contemporary concrete constructions, the concrete used in Roman buildings was normally protected with brick or stone. The Romans used concrete extensively from three hundred BC to Advertisement 476.[eighteen] Over the Roman Empire, Roman concrete (or opus caementicium) was created https://bookmarkingdelta.com/story19729461/helping-the-others-realize-the-advantages-of-concrete-reinforced-with-rebar