AN EXPERIMENTAL STUDY ON BEHAVIOUR OF RECYCLED AGGREGATE CONCRETE WITH GROUND GRANULATED BLAST FURNACE SLAG FLYASH

Concrete is the single largest manufactured material in the world . The use of recycled materials in construction is an issue of great importance. Utilization of Recycled Aggregates (RA), Ground Granulated Blast Furnace Slag (GGBFS) and fly ash in concrete addresses this issue. In this project, strength, durability of Recycled Aggregate Concrete (RAC) with GGBFS was studied. M - 50 grade concrete with 0.30 w/c ratio and maximum size of 16mm course aggregate was used for this study. Totally 16 mix combinations were prepared for thi s study with different replacements of Recycled aggregate (0%, 25%, 50%, and 100%) and GGBFS (0%, 20%, 30%, and 40%). Compressive & Tensile tests were conducted at 7, 14, and 28 days to study the strength characteristics and Sorptivity test were conducted to examine the durability characteristics. It was found that the replacements of Natural Aggregate (NA) and cement with Recycled aggregate and GGBFS respectively, significantly decrease both the compressive and tensile strength and cement with GGBFS replac ement increases the resistance against permeability. Based on experimental results it was concluded that 40% replacement of GGBFS and 50% replacement of RA give satisfactory results and it is recommended for reinforced concrete works with proper mix design