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how much cement required for M20 grade concrete?

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how much cement required for M20 grade concrete?
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The amount of cement required for any grade of concrete depends upon the strength and condition requirement of the project and also on water cement ratio.
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As per nominal mix 1:1.5:3

According to this nominal mix i can say cement bags.cement required = ((1/5.5)*1440) = 262kg = 5.24 bags of cement.

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