Cement is a fine powder that is used to bind other materials together. Cement is mainly composed of lime and silica, which are obtained from calcareous and argillaceous compounds. Cement also contains other elements, such as alumina, iron oxide, calcium sulphate, magnesia, sulphur, and alkalies. Cement has four main compounds: tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetra-calcium aluminoferrite. Cement is so fine that 1 pound of cement contains 150 billion grains.
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