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Some grinding aids are described as quality improvers because they

  • A.remove all of the alkalis from the finished ground product
  • B.eliminate the need for any gypsum at all to be added
  • C.also raise the strength of the cement at a given fineness
  • D.make the finished cement a lighter colour when dispatched

Answer: C

Certain compounds influence the early hydration reactions as well as dispersing the particles, so strength rises beyond what the extra fineness alone would give. The distinction from a plain grinding aid is one of effect rather than of dosing.

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