The powder, when mixed with water undergoes a chemical reaction and cures into a hard solid. Cement is made by heating limestone and clay, then grinding it with gypsum. Made from Portland cement mixed with sand and gravel (aggregates) and water, concrete is a hard, dense material. Common forms of concrete construction include concrete blocks, concrete poured into formwork and allowed to set, and precast concrete panels. It is a familiar building material for many building professionals. Romans used concrete for many of their buildings and monuments, some of which are still around today. Concrete has been used in construction around the world for over one thousand years.
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