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Portland pozzolana cement is made by blending clinker with

  • A.additional gypsum beyond the usual amount
  • B.coarse sand to reduce the cost
  • C.iron ore to improve the colour
  • D.a pozzolanic material such as fly ash

Answer: D

The pozzolana reacts with the calcium hydroxide released during hydration to form further binding compounds. Strength develops more slowly but durability is often better. The reaction also consumes lime that would otherwise be leached out.

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