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Insoluble residue in a cement analysis is a measure of

  • A.material that does not dissolve in acid, indicating adulteration
  • B.the quantity of mixing water needed to reach standard consistency
  • C.the free lime that is left remaining after the burning
  • D.the proportion of gypsum present in the finished cement

Answer: A

Portland clinker dissolves almost completely, so a high residue points to siliceous material having been added. The test is a check on composition rather than on any performance property. It answers a question about honesty rather than about behaviour.

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