Which of the following is the primary source of calcium in Portland cement production?
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A.
Clay
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B.
Shale
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C.
Limestone
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D.
Iron ore
Correct Answer:
C. Limestone
Explanation:
Limestone is the primary source of calcium in the production of Portland cement. During the manufacturing process, limestone—which consists mainly of calcium carbonate—is heated in a kiln to produce calcium oxide, the essential binding ingredient in cement. While other materials like clay and shale provide necessary silica, alumina, and iron oxide, limestone serves as the fundamental raw material that supplies the high concentration of calcium required for the cement's chemical structure.
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