Characterization of recycled aggregate concrete

Abstract

The effects of using crushed waste concrete as coarse aggregates upon fresh and hardened properties of concrete were investigated through series of testing concrete cylinder specimens to failure. The coarse recycled concrete aggregate (RCA) used in this investigation was sourced from the tested concrete specimens like cubes, cylinders, prisms and beam specimens originally tested for various purposes in the concrete testing laboratory of IIT Roorkee. Total six numbers of concrete mixtures were prepared. These mixtures were differing only in amount of coarse RCA used. The mixture without any RCA was referred as control mixture. Considerable effect of replacement level on compressive strength was observed. Moreover increase in peak strain and significant decrease in static modulus was observed. Stress-strain curves generated duringtesting were utilized to evaluate normalized toughness and ductility index. Higher value of replacement level found decreasing normalized toughness and ductility index.