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Overburning a clinker is undesirable because it

  • A.leaves a large quantity of free lime behind in the clinker
  • B.prevents any alite from forming at all in the burning zone
  • C.makes the finished cement set within a very few seconds
  • D.wastes fuel and produces clinker that is hard to grind

Answer: D

Excess temperature enlarges the crystals and consolidates the clinker, so more electricity is needed at the cement mill. The fuel and the electricity are both wasted for no gain in quality. Overburnt clinker often shows large alite crystals under the microscope.

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