Concrete arches

The masonry arch has proved itself to be the best form of bridge for many purposes. It possesses that quality which is appreciated under most conditions, that of architectural beauty. It is by far the most permanent of structures, for example, arches built by the Romans, 2000 years B.C., notably the Ponte Rotto, are still either wholly or partially in existence . Many of these arches contained a large amount of concrete, and often steel imbedded therein, and hence give a proof of the durability of both those materials under such conditions