Opus caementicium uncovered in a very characteristic Roman arch. In contrast to fashionable concrete buildings, the concrete used in Roman structures was ordinarily lined with brick or stone. The Romans applied concrete thoroughly from three hundred BC to AD 476.[eighteen] In the course of the Roman Empire, Roman concrete (or https://backlink46791.dailyhitblog.com/41228654/not-known-facts-about-concrete-reinforced-with-natural-fibers