[Francis* et al., 5(5): May, 2016] ISSN: 2277-9655 IC™ Value: 3.00 Impact Factor: 3.785 http: // www.ijesrt.com © International Journal of Engineering Sciences & Research Technology [666] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY STUDY ON EFFECTS OF COARSE AGGREGATE SIZES ON CONCRETE WITH QUARTZ POWDER Libin Daniel Francis * , B.Karthick *PG Student, Assistant Professor * Department of Structural Engineering, CSI College of Engineering, The Nilgiris, India Department of Structural Engineering, CSI College of Engineering, The Nilgiris, India DOI: ABSTRACT 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. . KEYWORDS:Mechanical properties,Characterestic strength,Aggregate size,Quartz powder. INTRODUCTION In the past few decades building around the world have become heigher and so the demand for the structural strength is increased.This heigher demand also pulls for a substitute material for the cement ,which is at par with the strength properties . The two main factors on which mechanical or macroscopic properties of concrete depends on the water-cement ratio and size of aggregate.It is well recognized that Coarse aggregate plays an important role in concrete.It occupies generally one-third of volume of concrete and researches indicates that change in coarse aggregate size can change the mechanical properties of concrete.To predict the behaviour of concrete under general loading requires an proper understanding of aggregates type,size and content. Various researches are constantly undergone to find various proportions of both coarse aggregates size and percentage by weight of mineral and chemical admixtures,that can be optimized to find a suitable proportion of above ,which is eco-friendly and economic and also a one which acquires the desired characteristic properties. QUARTZ POWDER Quartz is the second most common material in Earths crust. It is made up of Silica(sio 2 )tetrahedral, with a hardness of 7 on Mohs scale. It is an essential component of igneous and metamorphic rocks. The lustre in some specimen is Vitrious, in others it is Greasy or Glossy. In pure form quartz is colourless, but oftenly coloured by impurities. EXPERIMENTAL INVESTIGATION The experimental investigation is conducted as detailed below. All the materials tests were conducted in the laboratory as per relevant Indian Standard codes. Basic tests were conducted on fine aggregate, coarse aggregate and cement to check their suitability for concrete making. The study aims to investigate the strength related properties of concrete of M30 grade.The proportions of ingredients of the control concrete of grade M30 had to be determined by