Opus caementicium exposed inside a attribute Roman arch. In contrast to modern concrete structures, the concrete used in Roman structures was normally covered with brick or stone. The Romans utilised concrete thoroughly from 300 BC to Advertisement 476.[eighteen] Through the Roman Empire, Roman concrete (or opus caementicium) was comprised of https://wax-and-co-pure-skin51481.blog-gold.com/46600972/fascination-about-concrete-reinforced-steel