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What Is The Difference Between Nominal Mix And Design Mix?



What Is The Difference Between Nominal Mix And Design Mix?

1- When concrete is produced using standard arbitrary proportions of concrete ingredients, it is known as nominal mix concrete.
2- The nominal mixture is a mixture taking into account all the ratios in the volume where the strength and cost of concrete and the strength of concrete vary.
3- It is concrete of the prescriptive type.
4- It is used in ordinary concrete involving a quality of concrete not higher than M20.
5- There is no quality control.
6- The water-cement ratio is based on sustainability criteria, experience and practical tests.
7- The water content can be modified by the slump value (field test)
8- No trapped air content is taken into account.
9. The concept of test mixtures is mentioned.
Design Mix
1-It can be defined as the process of selecting the appropriate ingredients of concrete and determining their relative proportions in order to produce concrete of a certain minimum strength and durability in the most economical way.
2- The design mix is ​​a mix considering that the whole mix ratio is by weight where the strength of the concrete is a constant cost of the concrete which can be reduced.
3- It is concrete based on performance.
4- It is adopted for high quality concrete.
5- It has quality control.