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The principal source of calcium in a cement raw mix is

  • A.limestone
  • B.clay
  • C.bauxite
  • D.iron ore

Answer: A

Calcium carbonate makes up the great bulk of the raw mix, usually around four fifths of it by mass. Clay supplies the silica and alumina, while bauxite and iron ore are used only as small corrective additions when the main materials fall short.

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