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Concrete mix is made from (sharp)sand, cement, aggregate and water. The ratios depent on the usage
Concrete :- a mix of cement, sand, water, and gravel. Mortar :- a mix of cement, sand, and water
The strength of concrete depends on the mix used to make it- ratio of cement, sand, gravel and water. If the mix does not produce a concrete that is strong enough, the concrete will break.
That depends on exactly what use that particular concrete mix is for.
The mix proportion for M40 concrete is 1:1.65:2.92W/C ratio = 0.4The design calculation is as per IS mix design