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For lean concrete bases and simple foundation for masonry walls ________ grades of concrete may be used.

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For lean concrete bases and simple foundation for masonry walls ________ grades of concrete may be used.

(a) M40 and M35

(b) M5 and M7.5

(c) M10 and M20

(d) M1.5 and M2.5

I got this question in an internship interview.

My enquiry is from Cement Concrete Construction in division Cement Concrete Construction of Construction & Building Materials

1 Answer

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Right answer is (b) M5 and M7.5

The best explanation: The letter M refers to the mix and the number indicates the specified concrete compressive strength of that makes at 28 days expressed in Newton per mm square. The grades of concrete lower than M15 are not to be used in RCC work.

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