The minimum grades for PCC and RCC structures as per IS code is:
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A.
M 10 and M 20 respectively
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B.
M 10 and M 15 respectively
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C.
M 15 and M 20 respectively
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D.
M 20 and M 30 respectively
Correct Answer:
C. M 15 and M 20 respectively
Explanation:
According to IS 456:2000, the minimum concrete grades are established based on structural type and environmental exposure to ensure durability. For Plain Cement Concrete (PCC), the code specifies a minimum grade of M15. For Reinforced Cement Concrete (RCC), which must withstand higher tensile stresses and protect embedded steel, the minimum grade is M20. These requirements apply to normal or mild exposure conditions; more aggressive environments would require higher grades. Thus, the correct pair is M15 for PCC and M20 for RCC.
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