M 20 Grade of Concrete.
These types of concrete are ordinary concrete and its mixing ratios are fixed and these mixing ratios are known as nomimal mix
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. Eg: M20(1:1.5:3); the quantity of cement, sand and aggregate is batched in volume as per the fixed ratio 1:1.5:3. From the above table till M25 grade, the concrete proportions are called as Nominal mix concrete.
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