Opus caementicium exposed in the attribute Roman arch. In distinction to modern concrete constructions, the concrete Employed in Roman structures was usually lined with brick or stone. The Romans made use of concrete extensively from 300 BC to Advertisement 476.[eighteen] Over the Roman Empire, Roman concrete (or opus caementicium) was https://cocoagriculture30627.blogsuperapp.com/36404598/the-best-side-of-reinforced-concrete