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The autoclave test differs from the Le Chatelier test in that it also detects expansion due to

  • A.excess gypsum in the finished cement
  • B.coarse grinding of the clinker
  • C.alkalis condensed on the clinker surface
  • D.magnesia as well as free lime

Answer: D

The higher temperature and pressure hydrate periclase, which the boiling water test does not reach. This is why standards that limit magnesia generally specify the autoclave method. The two tests answer different questions about the same property.

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