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The interstitial material between the silicate crystals in clinker consists chiefly of

  • A.free lime and free magnesia
  • B.aluminate and ferrite phases
  • C.unreacted limestone particles
  • D.gypsum added during grinding

Answer: B

Correct answer: aluminate and ferrite phases

The two silicates crystallise out of the melt, and what remains solidifies between them as tricalcium aluminate and the ferrite phase. These are the fastest reacting components of cement - the aluminate would flash-set without gypsum - and they largely determine the early behaviour of the paste.

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