Opus caementicium exposed in the attribute Roman arch. In contrast to fashionable concrete buildings, the concrete used in Roman structures was ordinarily lined with brick or stone. The Romans used concrete extensively from 300 BC to Advertisement 476.[eighteen] In the Roman Empire, Roman concrete (or opus caementicium) was constructed from https://moon-knight-creator39257.canariblogs.com/examine-this-report-on-concrete-reinforced-wall-50618568