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A cement contains 5 per cent gypsum, 15 per cent limestone and the remainder clinker. What is the clinker content?

  • A.85 per cent
  • B.75 per cent
  • C.20 per cent
  • D.80 per cent

Answer: D

Subtracting 5 and 15 from a hundred leaves 80 per cent clinker. Standards define the permitted ranges for each constituent, and a cement is designated according to where its composition falls. Composition limits are set by standard rather than by the maker.

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