Portland cement comes from elements found in limestone, including aluminum, calcium, and silica. Lime and silica make up about 85 percent of cement. Other ingredients in cement usually include clay and silica, or silica sand.
Portland cement comes from elements found in limestone, including aluminum, calcium, and silica. Lime and silica make up about 85 percent of cement. Other ingredients in cement usually include clay and silica, or silica sand.
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