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Alkalis such as sodium and potassium in the raw materials are limited because they

  • A.prevent the clinker minerals from forming properly in the kiln
  • B.make the finished cement set within seconds of being mixed
  • C.increase the fuel needed to reach the burning temperature
  • D.can cause alkali-aggregate reaction in the finished concrete

Answer: D

The reaction between alkalis and certain reactive aggregates produces an expansive gel that cracks the concrete years after construction. Where such aggregates are in use, a low-alkali cement is specified to avoid the problem.

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