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avg strength of concrete is 20 N/mm2 i,e, 95% of the tested ones gives 20n/mm2

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12y ago
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12y ago

C : refer to concret

20 : its Resistance of concret cube when we make test on it after 28 days measuring by N/mm2.

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11y ago

1:3:6

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11y ago

1:1.5:3

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Q: What is the composition of m20 concrete?
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