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Fly ash and slag are interground or blended with clinker in order to

  • A.reduce clinker content while retaining performance
  • B.raise the early strength of the cement very sharply
  • C.increase the heat that is evolved during hydration
  • D.make the finished cement set within a few minutes

Answer: A

Correct answer: reduce clinker content while retaining performance

Both are latent hydraulic or pozzolanic materials, so they contribute to strength themselves rather than merely diluting the cement. Replacing clinker with them cuts the fuel, the process carbon dioxide and the cost together, and it uses a material that is otherwise a waste from another industry.

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