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Tetracalcium aluminoferrite contributes chiefly to

  • A.the early strength of the concrete
  • B.the resistance to sulphate attack
  • C.the fineness achieved during grinding
  • D.the grey colour of ordinary cement

Answer: D

The iron compound gives cement its characteristic colour, and reducing it is how white cement is made. Its contribution to strength is comparatively small. It also lowers the temperature at which the kiln charge begins to melt.

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