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Concrete (Composition used in building)

a composition used in building, consisting of hydraulic or other mortar mixed with gravel or stone chippings about the size of a nut. It is used extensively in building under water, for or sluice, or the foundation of any struc example, to form the bottom of a canal ture raised in the sea; and it is also fre quently used to make a bed for asphalt buildings of any kind. It is used as the are built, the concrete being run into buildings of any kind. It is used as the material with which the walls of houses moulds of the requisite shape, and then allowed to set. It is generally re-enforced with steel wire to strengthen it especially in open wall building. See CEMENT.