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Gypsum content in finished cement is optimised because

  • A.it is by far the cheapest constituent available to the plant
  • B.it alone determines the final colour of the finished product
  • C.it must always be matched to the alkali content exactly
  • D.too little permits flash set and too much causes expansion

Answer: D

The optimum depends on the aluminate content and the fineness, so it is determined by trial rather than assumed. Standards set a maximum on total sulphate, which the optimum must respect. The optimum is found by trial on the actual clinker and mill.

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