Opus caementicium exposed within a characteristic Roman arch. In distinction to modern day concrete buildings, the concrete Employed in Roman structures was usually protected with brick or stone. The Romans utilised concrete thoroughly from 300 BC to Advert 476.[18] Through the Roman Empire, Roman concrete (or opus caementicium) was made https://pantip90537.therainblog.com/34603292/concrete-reinforced-wall-an-overview