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Structural Design Specifications - Engineering

Q1:

The characteristic strength of concrete is the strength of material if its test result is not less than

A 2%

B 3%

C 4%

D 5%

E 10%

ANS:D - 5%

Characteristic strength means 28 days, 3 cylinder/cube avg strength. It can vary by 5 per cent from the expected nominal value.

Individual cylinder/cube strength if varies within 15 per cent from avg, should be acceptable otherwise rejected.