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Q: For an ordinary Portland cement which statement is incorrect.
  • A. Residual does not exceed 10% when sieved through IS Sieve No. 9
  • B. soundness varies from 5 to 10 mm
  • C. initial setting time is not less than 30 minutes
  • D. compressive stress after 7 days, is not less than 175 kg/cm²
Correct Answer: Option D - For an ordinary Portland cement – • Residual does not exceed 10% when sieved through I.S. sieve NO - 9. • Initial setting time is not less than 30 minutes. • Final setting time is 10 hour • Specific gravity 3.15 • Soundness of cement should not exceed 10 mm. Days Compressive strength(N/mm²) 7 16 14 22 28 33
D. For an ordinary Portland cement – • Residual does not exceed 10% when sieved through I.S. sieve NO - 9. • Initial setting time is not less than 30 minutes. • Final setting time is 10 hour • Specific gravity 3.15 • Soundness of cement should not exceed 10 mm. Days Compressive strength(N/mm²) 7 16 14 22 28 33

Explanations:

For an ordinary Portland cement – • Residual does not exceed 10% when sieved through I.S. sieve NO - 9. • Initial setting time is not less than 30 minutes. • Final setting time is 10 hour • Specific gravity 3.15 • Soundness of cement should not exceed 10 mm. Days Compressive strength(N/mm²) 7 16 14 22 28 33