What do you understand by “Grade of concrete”

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Rajesh N V

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means a concrete of characteristic strength
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Grade of concrete refers to the strength of concrete after a period of 28 days.
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The grade tells you the characteristic compressive strength of concrete. Which means if you have 100 concrete cubes of a given grade (say M20), only 5 percent (5 cubes) of the sample will have a strength less than the given characteristic compressive strength (that is 20).
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