Concrete a composite made of a fine and coarse aggregate bonded with a fluid cement paste that hardens over time is a composite a material made of two or more components with different physical or chemical properties which, when combined, produce a material with different characteristics than the original materials made of cement and an aggregate a component of a composite material that resists compression stress (sand or stones). It is used to make buildings and large structures. However, it tends to crack under large pressure. This puts a limit on the structures that can be made with it.

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