The grading and maximum size of Coarse Sand Zone 2 for Piling is important parameters in any concrete mix. They affect relative proportions in mix, workability, economy, porosity and shrinkage of concrete etc. Experience has shown that very fine Coarse Sand Zone 2 for Piling or very coarse sands are objectionable – the former is uneconomical, the latter gives harsh unworkable mixes. Thus the object in this paper is to find the best fineness modulus of sand to get the optimum grading of combined aggregate (all-in-aggregate), which is most suitable, and for economy. It is well–known that Coarse Sand Zone 2 for Piling plays an important role in achieving the desired properties of concrete. Though, Coarse Sand Zone 2 for Piling constitute 80 to 90% of the total volume of concrete, yet very little attention is given in controlling the grading and surface texture of Coarse Sand Zone 2 for Piling to optimize the properties of concrete. Improper blend of Coarse Sand Zone 2 for Piling influences the cement and water demand for a given concrete mix and affects workability, compatibility, and cohesion characteristics of pump able concrete mix. It also influences the compressive strength, flexural strength and other properties like permeability & durability of concrete. The results indicate that with the change in fineness of sand, workability gets affected. The details of findings and its effect on compressive and flexural strength and permeability, influencing durability are reported in this paper.