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The water to cement ratio of a mix is important chiefly because it governs

  • A.the quantity of coarse aggregate that can be used
  • B.the alkalinity of the pore water in hardened concrete
  • C.the porosity and therefore the strength of the paste
  • D.the colour of the finished hardened concrete surface

Answer: C

Water not consumed by hydration leaves capillary pores behind as it evaporates, and strength falls sharply as porosity rises. This single ratio does more to determine the quality of concrete than any other decision in the mix.

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