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Discussion

Clinker microscopy is used to assess

  • A.crystal size and distribution of the phases present
  • B.the compressive strength of the finished hardened concrete
  • C.the moisture content of the incoming raw materials
  • D.the electrical consumption of the finish cement mill

Answer: A

Correct answer: crystal size and distribution of the phases present

A polished and etched section under the microscope shows the alite and belite crystals, their sizes and shapes, the interstitial material between them and any free lime. Those features record how the clinker was burnt and cooled, so microscopy is used as a diagnostic on the kiln as much as a description of the product.

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