1CONCRETE AS A STRUCTURAL MATERIAL•700 million tons of cement produced per year in the the world, and used to make 5.5 billion tons of concrete per year (in 1993). (11 billion tons in 2006)•Consumption of concrete is about 5 times the consumption of steel by weight in the U.S. Why is concrete so widely used?•Excellent resistance to water.•Ease with which concrete elements can be formed into a variety of shapes and sizes.•Low cost.•Readily available. The raw materials for making cement are widely available. Components of Concrete•Portland cement•Coarse aggregate - larger than 4.75 mm (# 4 sieve)•Fine aggregate - smaller than 4.75 mm•Water•Admixture
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