According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than
A. 7 MPa
B. 11.5 MPa
C. 16 MPa
D. 21 MPa
Answer: Option C
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Tensile strength of OPC after 3days nd 7 days: 2 nd 2.5 MPa respectively..
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Tell me the formula...to find the strength of 3or 7 days..
The compressive strength of cement after 3 days should not be less than 11.5 mpa and for 7 days the compressive strength should not be less tham 17.5 mpa, so the correct option is b)