CONCRETE MIX DESIGNS AS PER INDIAN STANDARD CODE SUGGESTED BY TEAM STONASAND
The process of selecting suitable ratio of ingredients on the basis of strength, durability, workability with the object of producing a concrete as economically as possible is termed as concrete mix design
- Nominal mix
- Standard Mix
- Designed mix
These mixes provide simplicity under normal circumstances having marginal strength above specified. Due to variability of mixed ingredients the nominal concrete for a given workability, may vary widely in strength nad durability.
IS 456-2000 has designated concrete mix into a number of grades which are as follows:
Here (M10, M15, M20, M25…….) denotes that after a setting time of 28 days
- For M10: The concrete block can withstand a force of 10 Newton applied over an area of 1mm2 e. (10N/mm2)
- For M15: The concrete block can withstand a force of 15 Newton applied over an area of 1mm2 e. (15N/mm2)
- RESPECTIVELY FOR M20, M25, M30
- In these mixes the performance of concrete is specified by the designer but the mixed proportions are decided by the producer of concrete.
- This is the most rational and economical approach to the selection of mix proportion with specific material in mind possessing more or less unique characteristics.
- However it does not serve as a guide since this does not guarantee the correct mix proportion of prescribed performance
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