MECHANICAL AND DURABILITY PROPERTIES OF SLAG BASED RECYCLED AGGREGATE CONCRETE

In this paper, the possibility of using recycled aggregate (RA) and ground granulated blast furnace slag (GGBFS) to produce a structural concrete was studied by compromising strength to a lesser extent. Hence an attempt has been made to study the strength and durability characteristics of the GGBFS-based recycled aggregate concrete. Four different groups of mixes were designed by replacing natural coarse aggregate (NA) 0, 25, 50 and 100% with recycled coarse aggregates. In each group the effect of RA was studied by replacing cement with GGBFS in different percentages from 20 to 50% with an increment of 10%. The effects of RA and GGBFS on fresh and hardened concrete properties were studied and the results were compared with natural aggregate concrete (NAC) and optimum replacement of RA and GGBFS was also found. Experimental results indicate that increase in concrete strength for all NA replacements with RA for GGBFS concrete upto 40% at the age of 90 days and further addition of GGBFS shows reverse trend.