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Q: How many days does it take for Rapid Hardening Cement to develop the same strength as that is expected of Ordinary Portland Cement at 7 days?
  • A. 4
  • B. 1
  • C. 3
  • D. 2
Correct Answer: Option C - Rapid hardening portland cement (IS : 8041) • RHC attains same strength in days which an ordinary cement may attain in 7 days. Properties– Initial setting time 30 minutes Final setting time 10 hours Compressive strength– 1 day 16.0 N/mm² 3 day 27.5 N/mm² Ordinary cement– Compressive strength – 3 day 16 N/mm² 7 day 22 N/mm² 28 day 33 N/mm²
C. Rapid hardening portland cement (IS : 8041) • RHC attains same strength in days which an ordinary cement may attain in 7 days. Properties– Initial setting time 30 minutes Final setting time 10 hours Compressive strength– 1 day 16.0 N/mm² 3 day 27.5 N/mm² Ordinary cement– Compressive strength – 3 day 16 N/mm² 7 day 22 N/mm² 28 day 33 N/mm²

Explanations:

Rapid hardening portland cement (IS : 8041) • RHC attains same strength in days which an ordinary cement may attain in 7 days. Properties– Initial setting time 30 minutes Final setting time 10 hours Compressive strength– 1 day 16.0 N/mm² 3 day 27.5 N/mm² Ordinary cement– Compressive strength – 3 day 16 N/mm² 7 day 22 N/mm² 28 day 33 N/mm²