This paper introduces the method of how to improve superfine sand grading and fineness modulus by the use of crushed_run stone which contains 20 percent of stone chippings smaller than 5 mm

and the technical means of how to formulate superfine_sand high_strength concrete(HSC) by blending fly_ash and admixture.In addition

based on the analysis of the results obtained from numerous comparative experiments on factors influencing concrete strength

the parameters of mix proportion for C50 and C60 superfine_sand HSC are determined.