Opus caementicium exposed in a very attribute Roman arch. In contrast to modern-day concrete buildings, the concrete Employed in Roman properties was usually coated with brick or stone. The Romans used concrete extensively from 300 BC to AD 476.[eighteen] Over the Roman Empire, Roman concrete (or opus caementicium) was made https://elliotkmmno.blog2freedom.com/35824443/about-concrete-reinforced-wall