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Which of these is not a compound of Portland cement clinker?

  • A.tricalcium aluminate
  • B.calcium sulphate
  • C.tricalcium silicate
  • D.dicalcium silicate

Answer: B

Calcium sulphate is the gypsum added after burning rather than a clinker mineral formed in the kiln. The other three are all products of the burning process. Distinguishing what the kiln makes from what is added later matters here.

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