How Did Romans Build Concrete

The Roman Empire was well known for their great architecture. Much of their building still exists, in part or in whole, sturdy and coherent. There is some Roman architecture in Italy, Syria, North Africa and the areas that were under Roman rule. Their buildings had been famous for being the first concrete buildings as the Romans were who invent the concrete. Also, they were famous for their applying to the arches in a wide range. Thus, I will discuss the importance of those two important factors, the arches and the concrete and their development. Also, I will discuss the results of their use.
The Roman buildings were built with a special concrete, unlike the concrete that we use in these days. That type of concrete was made from pozzolana, a dark material of volcanic dirt. Pozzolana was discovered in Puteoli, later it was found in huge amounts around Rome. The Romans mixed that material with lime in addition to some sort of larger and hard rocks, sand and some strange contents to make it harder. Concrete allowed the construction of very large, permanent structures.
Also, it was used in building castles and forts to fortify and protect them from their enemies. Concrete was a great material in building city walls and bridges on the rivers to make the movement of the people and the armies easier. It was used to erect the aqueducts to supply the houses and the public places with water, as well.
Furthermore, with the concrete, the Romans managed to build many great buildings, which managed to survive such as the Colosseum. The Colosseum was an obvious example for the use of both arches and concrete. That is because the arches made of concrete were used in the corridors and the