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Magnesia in excess is limited in cement standards because it

  • A.hydrates slowly and causes delayed expansion
  • B.makes the cement set almost instantly on mixing
  • C.prevents the clinker from forming in the kiln at all
  • D.gives the finished cement an undesirable colour

Answer: A

Periclase, the crystalline form of magnesia, reacts long after hardening and causes unsoundness in much the same way as free lime. Standards therefore cap its content. Dolomitic limestone must therefore be used with care in the raw mix.

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