Opus caementicium exposed inside a characteristic Roman arch. In contrast to modern-day concrete buildings, the concrete used in Roman structures was generally included with brick or stone. The Romans employed concrete thoroughly from three hundred BC to AD 476.[18] Through the Roman Empire, Roman concrete (or opus caementicium) was created https://angelojnppo.glifeblog.com/34642677/fascination-about-concrete-reinforced-steel