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Large alite crystals in a clinker section generally indicate

  • A.an unusually low lime saturation factor in the mix
  • B.that gypsum had been added to the mix before burning
  • C.a long residence time or high burning temperature
  • D.that the clinker had been cooled extremely rapidly

Answer: C

Crystals grow with time and temperature, so their size is a direct record of the burning conditions. Very large crystals accompany the hard, difficult-to-grind clinker produced by overburning. Grinding energy at the cement mill rises accordingly.

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