STUDY ON EFFECTS OF COARSE AGGREGATE SIZES ON CONCRETE WITH QUARTZ POWDER

Concrete has under gone many developments based on the studies of influence of both type and composition of cement ,aggregates and admixtures.This paper examines the influence of different proportions of coarse aggregate size on the mechanical properties of concrete,along with an intention of finding a suitable substitute material for the binder.For a concrete of M30 grade two types of aggregate proportion is chosen-Type I constitutes of 33.33% of 20mm,12mm and 10mm each.Type II constitutes of 50% of 20mm,25% of 12mm and 12.5% of 10mm and 6mm each.From both the cases of concrete mix, cement will be partially replaced by Quartz powder by 5%,10%,and15% by percentage weight of cement.The results obtained proved that the mechanical strength of concrete was more in Type II than in Type I and the nominal concrete mixes,also the results indicated that the characteristic strengths of concrete shows a linear variartion with increase in quantity of quartz powder.