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White Portland cement is produced by

  • A.using raw materials very low in iron
  • B.adding a white pigment after grinding
  • C.burning the clinker at a lower temperature
  • D.omitting the gypsum from the mix

Answer: A

Iron gives ordinary cement its grey colour, so china clay and limestone of low iron content are used instead. The cement is correspondingly more expensive to make. It is specified for architectural finishes and for terrazzo work.

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