Nominal mix - Definition and grades.

The concrete proportion of M5 to M25 grade concrete are called Nominal mix.
  Nominal mix is generally adopted for small scale constructions. In this type of mix, the mix ratios and concrete constituent proportions are prefixed and specified.
Example-For M20 grade of concrete, the quantity of cement, sand aggregate is batched in volume as per the fixed ratio 1:1.5:3.
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