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Supersulphated cement is made principally from

  • A.calcined bauxite finely ground together with limestone
  • B.magnesia activated by means of a chloride solution
  • C.ground granulated slag with calcium sulphate and a little clinker
  • D.Portland clinker together with a very much larger gypsum addition

Answer: C

The slag is activated by sulphate rather than by lime, so the clinker content is only a few per cent. It gives good resistance to sulphate and to weak acids but needs careful curing and is sensitive to high temperature.

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