Concrete is an artificial engineering material made from a mixture of Portland cement, water, fine and coarse aggregates together with a small amount of air. It is among the most widely used materials for construction in the world. Concrete is the only major building material that can be delivered to the job site in a plastic state (that is, capable of being moulded). This unique quality makes concrete desirable as a building material because it can be moulded to virtually any form or shape. Concrete provides wide latitude in surface textures and colors and can be used to construct a wide variety of structures, such as highways and streets, large buildings, airport runways, irrigation structures, breakwaters, piers and pavements, silos and farm buildings, homes, and even barges. Other desirable qualities of concrete as a building material are its strength, economy, and durability. The tensile strength of concrete is much lower, but by using properly designed steel reinforcing structural members can be made that are as strong in tension as they are in compression.
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