Concrete

What is concrete? Concrete is a mixture of cement, water and little stone. This material is widely used in construction, as a material that is well suite to any form. But, how do you obtain the concrete shape you want? It’s really very simple, you just have to make a mold and pour the mixture into it. Wow, interesting, and when did concrete begin to be used? Concrete was employed from times of ancient Egyptians and Romans. It was used to perform vaults, domes and certain elements of structures like bridges. What are the structural properties of concrete? Concrete is molds to any shape and is strong in compression, but cracks with temperature changes and is weak in tension. For this reason it was invented the reinforced concrete, to add the tensile strength of steel to the compressive strength of mass concrete. This concrete type is used for building structures, bridges, and infrastructure and even to coat the walls of the tunnels. The concrete must go through safety tests for use? Of course! Each concrete mixture takes a small cylinder of displays, which must passes strength proofs. If the cylinder fails to complete the proof sample, the entire mixture should be discarded, since there is a risk that the structure fails, and trigger tragedies.