Cement, Portland
Cement, Portland : Portland cement commonly consists of hydraulic calcium silicates to which the addition of certain materials in limited amounts is permitted. Ordinarily, the mixture consists of calcareous materials such as limestone, chalk, shells, marl, clay, shale, blast furnace slag, and so on. In some specifications, iron ore and limestone are added. The mixture is fused by calcining at temperatures usually up to 1,500 C
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