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Ordinary Portland cement is manufactured principally from

  • A.limestone and clay burnt together
  • B.sand and gravel mixed with water
  • C.gypsum and iron ore ground together
  • D.fly ash and slag blended cold

Answer: A

The two supply the calcium, silica, alumina and iron that the clinker minerals require. Gypsum is added later, after burning, to control the setting time. Burning the two together at high temperature is what forms the clinker minerals.

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