International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 06 | June -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 2735 “Performance of Recycled Aggregates using GGBS” An Experimental Study Er. Ramanuj Jaldhari 1 & Er. Bharat Nagar 2 1 M.Tech Scholar, Jagannath University, Jaipur (Rajasthan) 2 Head of Department, Civil Engineering, Jagannath University, Jaipur (Rajasthan) ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – In producing concrete aggregate is one of the main ingredients. It covers 75% of the total for any concrete mix. The strength of the concrete is dependent on used aggregates properties. So need of coarse aggregate arises with respect to time, for this solution an alternative source of coarse aggregate required. Main scope for this project was to determine the durability and strength characteristics of structural concrete by using recycled coarse aggregates with replace of natural coarse aggregates, which will give a better understanding on the properties of concrete with recycled aggregates. The purpose of this project was to investigate the possibility of using low cost recycled coarse aggregates as a substitute material to coarse aggregate in high strength structural concrete. The experimental investigation are carried out using detailed strength and durability related tests such as flexural strength test of beams , compressive strength test of cubes,. The supplementary cementitious material used in this study was GGBS without replacing cement. The tests were conducted by replacing the coarse aggregates in high strength concrete mixes by 0, 5, 10, 15, 20, 25 and 30% of recycled coarse aggregates and 5% of GGBS also used with the recycled aggregates mix. In this study used Recycled Aggregates as an aggregate in the production of new concrete was investigated. The performance of compressive strength produced by Recycled Aggregate Concrete and results were compared with the Natural Coarse Aggregate Concrete. The studies were conducted with an M25 mix with the selected w/c ratio: 0.46 and the development of compressive strength of the recycled aggregates concrete and natural aggregates concrete at the age of 7 & 28 days were studied. Keywords: Recycled Coarse Aggregates (RCA), Ground Granulated Blast Furnance Slag (GGBS), Ordinary Portland Cement (OPC) 1. Introduction Reuse and Recycling of construction & demolition wastes seems workable solution in rehabilitation and new constructions after the demolition of old construction. This becomes very important especially for those countries where national and local policies are strict for disposal of construction and demolition wastes with guidance, penalties etc. Central Pollution Control Board has estimated 52 million tons per annum solid waste generation in India out of which, waste from construction industry is more than 30%. The total amount of waste from construction industry is estimated to be 160 to 175 million tons per annum out of which 70-80 million tons are concrete and brick waste. The supplementary cementitious material used in this study was GGBS without replacing cement. The tests were conducted by replacing the coarse aggregates in high strength concrete mixes by 0, 5, 10, 15, 20, 25 and 30% of recycled coarse aggregates and 5% of GGBS also used with the recycled aggregates mix. 2. Literature Survey Jayalakshmi Nair & Basil Johny (2016) [1], have study about the effects of using recycled materials in different quantity with concrete & GGBS on control design of M40. From these test results concrete with 40% and 50% replacement of cement with GGBS together with 50% replacement of recycled aggregates shows adequate strength compared to control mix. The maximum compressive strength of 28 days cubes is 49.33 N/mm 2 for 50% recycled aggregates used. M. Manjunath & K. Prakash (2016) [2], also study on effect if supplementary cementitious materials on strength of recycled aggregates concrete. The study was based on reference concrete mix of grade M20 using natural aggregates and partially replacement of coarse aggregates by recycled aggregates. In this study supplementary materials evaluated are silica fume (SF), metakaolin (MK) and ground granulated blast furnace slag (GGBS) at 10% partial replacement to cement. The maximum compressive strength of 28 days cubes is 28.37 N/mm 2 for 0% recycled aggregates used and 10% GGBS replacement of cement. S.K. Singh (2013) [3], As per research work compare some of the mechanical properties of recycled aggregate concrete (RAC) with the natural aggregate concrete (NAC). The two different mix proportions of characteristic strength of 20 N/ mm2 (M 20) and 25 N/mm2 (M 25) commonly used. The proportions of the ingredients constituting the concrete mixes are 1:1.5:2.9 and 1:1.2:2.4 with water cement ratio 0.50 & 0.45 respectively for M-20 & M-25 grade concrete.