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According to IRC:15-2011, Minimum cement content for 4.5 N/mm^2 characteristic flexural strength for PPC shall _________

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According to IRC:15-2011, Minimum cement content for 4.5 N/mm^2 characteristic flexural strength for PPC  shall _________

(a) Shall not be less than 360 kg/m^3

(b) Shall not be less than 425 kg/m^3

(c) Shall not be less than 340 kg/m^3

(d) Shall not be less than 500 kg/m^3

I got this question in a job interview.

My question is based upon Road Method of Mix Design topic in section Concrete Mix Design of Concrete Technology

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Correct option is (b) Shall not be less than 425 kg/m^3

Explanation: According to IRC:15-2011, Minimum cement content for 4.5 N/mm^2 characteristic flexural strength for OPC shall not be less than 425 kg/ m^3 and for opc it  shouldn’t be less than 360 kg/ m^3.

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