Opus caementicium exposed inside of a attribute Roman arch. In distinction to modern-day concrete structures, the concrete used in Roman structures was usually lined with brick or stone. The Romans applied concrete extensively from 300 BC to AD 476.[18] Throughout the Roman Empire, Roman concrete (or opus caementicium) was made https://bydatto379134.blog-eye.com/35935638/the-ultimate-guide-to-concrete-reinforced-beam