Concrete

= CONCRETE = media type="file" key="iron and steel.wav" The concrete is a construction material and its composition is a mixture of cement, water, with sand and stone. The properties of this material is that hardens rapidly, is water and fire resistant ones that is dry, it has great compressive but low tensile strength. It's easily mold when is in its liquid form, it can be attached to other types of material and its a cheap.

concrete was use in the ancient Egypt and Romans. creating many types of methods to construct, like the domes and vaults construction. Also was used in sewerage system.

this material was s implemented till middle ages and gained again in 18th century. The in 1860s the reinforced concrete was invented, having more tensile strength using this material in railways ties, pipes, floors, arches and bridges.

Nowadays the concrete is commonly used in hardscape construction normally as flooring of a patio, pavement of a city, also in wall, foundations and many types of structure, etc.