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Problem statement: Production of concrete is always deal with inconsistency. Sources of&#13; variation like materials from different geographical basis, mix design method, fineness of aggregates&#13; and so on will attribute to different level of achievement of the concrete. Even though researcher had&#13; verified that higher fineness modulus of sand would yield better performance for the concrete, but so&#13; far there have been scarce amount of paper reported on the mix design method adopting high fineness&#13; modulus of sand. Approach: This study discussed the revolution of design mix proportion towards&#13; achieving high strength with considerably cement content using local availably constituent materials.&#13; A total of 15 mixes was casted till to the high strength at more than 65 MPa was achieved. The&#13; compressive strength and workability of each mixes were presented. The method of mixture&#13; proportioning was begun with British Department Of Environment (DOE) method. Then, rational&#13; design method of achieving high strength concrete was developed. Results: At the end of experimental&#13; program, it was found that DOE method was not suitable to apply in designing high strength concrete.&#13; 12% was the optimum level of replacement of the total binder content by silica fume. Further increase&#13; of total binder content without adjustment to the amount of aggregate content has decreased the&#13; strength achievement of the concrete. Very coarse fine aggregate with fineness modulus 3.98 increased&#13; the compressive strength of the concrete in large extent. The increased of superplasticiser from 2.0% to&#13; 2.5% has decreased the compressive strength of the concrete. Conclusion: The rational mix design&#13; approach was developed. A Grade 70 concrete can be produced with moderate level of cement content&#13; by this approach

Rational Mix Design Approach for High Strength Concrete Using Sand with very High Fineness Modulus