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A water-reducing admixture works by

  • A.dispersing the cement particles so less water is needed
  • B.chemically combining with all of the excess mixing water
  • C.increasing the quantity of cement that is required
  • D.preventing the cement from hydrating in the usual way

Answer: A

Cement grains flocculate and trap water between them, and the admixture disperses them so that the trapped water becomes available for workability. The same slump can then be reached at a lower water content and a higher strength.

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