According to IS 456, what is the minimum grade of reinforced cement concrete (RCC) permissible for structural members in moderate exposure conditions?

Explanation

According to IS 456 standards, the minimum grade of reinforced concrete (RCC) for mild exposure is M20, moderate exposure is M20, severe exposure is M25, very severe is M30, and extreme exposure is M35. For plain concrete (PCC), minimum grade for mild is M15.