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The grade of concrete used in plain cement concrete sewer is __________

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The grade of concrete used in plain cement concrete sewer is __________

(a) M5

(b) M10

(c) M15

(d) M20

I had been asked this question in an interview for internship.

This interesting question is from Material for Sewers topic in section Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering

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Correct answer is (d) M20

Explanation: M20 grade of concrete is used in plain cement concrete sewer. It includes cement, fine aggregate and coarse aggregate in the ratio of 1:1.5:3.

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