INFLUENCE OF AGGREGATE’S TREATMENT ON PROPERTIES OF RECYCLED AGGREGATE CONCRETE

The comparative result of the experiments of fresh and hardened concrete with different replacement ratios of natural aggregate with recycled coarse aggregate and recycled fine aggregate is presented in this paper. Four types of concrete mixtures were tested: concrete made Completely with natural aggregate (NAC) as a control concrete and three others types of concrete made with recycled fine aggregate and treated recycled coarse aggregate. In this study replacement of Natural aggregate is restricted up to 30% of coarse recycled aggregate. Moreover fine aggregates replaced in 50% and 100% to Fine recycle aggregates. There are three types of treatment under consideration for recycled aggregate (1) Abrasion of Recycled Aggregate (RA) (2) Cement slurry coating of RA (3) Chemical immersion of RA. The results indicate that concrete produced with higher percentage of fine RA shows less workability in comparison to control concrete. It was found that strength of RCA concrete have equivalent or higher performance to concrete made with natural aggregates, for corresponding 28-day design strengths. Abrasion treatment to Recycled aggregate gives better result in all among treatments. The replacement ratio of coarse RA and fine RA is not affected in satisfactory performance recycled aggregate concrete (RAC) results.