Question

According to IRC:15-2011, Characteristic Flexural Strength at 28 days is ____________

(a) 4 N/mm^2

(b) 4.5 N/mm^2

(c) 5 N/mm^2

(d) 3.5 N/mm^2

I got this question in an international level competition.

My question is taken from Road Method of Mix Design in division Concrete Mix Design of Concrete Technology

Answer 1

Right answer is (b) 4.5 N/mm^2

The best I can explain: According to IRC:15-2011, Characteristic Flexural Strength at 28 days is 4.5 N/mm^2 and rest all values don’t stand anywhere.