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Rapid hardening Portland cement differs from ordinary Portland cement chiefly in having

  • A.no tricalcium aluminate at all
  • B.a higher C3S content and finer grinding
  • C.a much larger proportion of gypsum
  • D.coarser particles and lower C3S content

Answer: B

More of the fast-reacting silicate and a greater surface area together speed the early strength gain. The final strength is not necessarily higher than that of ordinary cement. The gain is in the rate rather than in the final figure.

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