International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2016): 79.57 | Impact Factor (2017): 7.296 Volume 7 Issue 5, May 2018 www.ijsr.net Licensed Under Creative Commons Attribution CC BY A Study on Rheological Behavior of Self Compacted Concrete with Coarse Aggregate of Size Varying from 6 mm and Less than 6mm Varsha R. Gunagi 1 , H. C. M. Swamy 2 , Dr. G. Prince Arulraj 3 1 Student, 8 semester B.E. Civil Engineering Department, Alva Institute of Engineering and Technology 2 Sr. Assistant, Professor, Civil Engineering Department, Alva Institute of Engineering and Technology 3 Dean and Professor of Civil Engineering Department Karunya University, Coimbatore, Tamil Nadu Abstract: Self Compacting Concrete (SCC) is a self- settling concrete without any vibration. Its important property is flowing on its own weight, requiring no labor for its compaction. Usually the aggregate size used in SCC varies from 10mm to 12.5mm, to accomplish for its flow on itself. The maximum percentage of coarse aggregate used in the SCC is about 50 to 55 percent, so that the remaining amount is mortar matrix, which is responsible for flow property of SCC. Now the problem in SCC is to obtain the desired target strength by using the available concrete mix design procedure. It is proved that in Delhi metro railway project that SCC can be effectively used, better than ordinary, high strength and high performance concrete. In this article we are using coarse aggregate, of size 6/5 mm and make an attempt to check its rheological property (Flow property). The method is compared with standard results and its use in Industry is justified. Keywords: Rheological behavior of SCC, Flow property of SCC, Effect of aggregate size on Flow property of SCC. 1. Introduction Self Compacting Concrete, is a new concrete material invented in Japan during 1980’s. The advantage of this concrete is that, save in labor, using mineral and chemical admixture to obtain required flow and strength. In this method the admixtures are used so effectively and tailored that the final product which we are obtained should be economical and feasible to the construction Industry. Usually the materials used in self compacting concrete are (i) Cement (ii) Coarse aggregate (iii) Fine aggregate (iv)Water (v) Mineral admixture (vi) Chemical admixture. Cement used here is OPC grade 53, coarse aggregate of 5/6 mm and below. Here an attempt is made to obtain the same flow as obtained by aggregate of size of 10 to 12.5mm. Here cement content used is also less than what is required for aggregate of size 5/6 mm. A comparative study is proposed to obtain flow parameters with standard results. The mechanism and the activity of super plasticizer and Viscosity Modifying Admixture (VMA) is also tested.This method is developed to use the aggregate of size less than 5/6mm and test its rheological behavior of SCC. The SCC is also contains the mineral admixture as silica fume. Its behavior with the cement and aggregates of size 5/6 mm is tested for flow and its final results are compared with standard results. The method is simple and can be applied to all different grades. Here the target strength is fixed as M40 and the cement is replaced by silica fume by 0, 5, 10 and 20 percent. 2. Methodology Physical Properties of the M40 grade concrete ingredients: 1) Specific Gravity of cement = 3.1 2) Standard consistency of cement = 27% 3) Initial setting time of cement = 45 minutes 4) Final Setting time cement =100 minutes 5) Fineness modulus of cement = 96.4% 6) Specific gravity of silica fume = 2.2 7) Specific gravity of the fine aggregate=2.6 8) Specific gravity of super plasticizer.=1.1 Here using IS -10262 procedure for concrete mix design and IS-456-2000 codes are used to prepare SCC mix of M40. The different percentages of silica fumes are used to replace cement and its rheological behavior is tested by using inverted Slump cone, V funnel Test and L-box test are performed and the results are tabulated. Table 1: Mix Design for SCC Percentage of Silica Fume Added Cement Kg/Cum Silica Fume Kg/Cum Fine Aggregate Kg/Cum Coarse aggregate Kg/Cum Water Kg/Cum Super Plasticizer Percentage VMA Percentage 0 398 0.200 825.25 1006.5 179 3 2 5 415.91 21.84 825.25 1006.5 179 3 2 10 394.02 43.67 825.25 1006.5 179 3 2 20 350.24 87.56 825.25 1006.5 179 3 2 Paper ID: ART20181884 DOI: 10.21275/ART20181884 430