Mix Design of High Strength Concrete - Procedure

1. The mean design strength is obtained by applying suitable control factors to the specified minimum strength.
2. For a given type of cement and aggregates used, the reference number corresponding to the design strength at a particular age is interpolated from figure 1 to 4.
3. The water-cement ratio to achieve the required workability and corresponding to the reference number is obtained from figure 5 for aggregates with maximum sizes of 20mm and 10mm.
4. The aggregate-cement ratio to give the desired workability with the known water cement is obtained by absolute volume method.
5. Batch quantities are worked out after adjustments for moisture content in the aggregates.

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