Q.

For an ordinary Portland cement

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
Answer» C. initial setting time is not less than 30 minutes
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