Shear Strength of Self Compacting Concrete made with Recycled Concrete as Coarse Aggregate

Abstract

            The chief objective of this research is to investigate the shear behaviour of self-compacting concrete (SCC) beams made with recycled concrete aggregate as coarse aggregate. All tested beams have same cross- section (220 x 320 mm). The studied parameters were percentage of RCA (0 and 50 %), shear span to effective depth ratio (1, 1.5, 2, 2.5) and percentage of web reinforcement (0, 0.26, 0.51 %). The tested beams were divided into four groups, each group consisted of four beams with a/d of (1, 1.5, 2, 2.5) for each beam. First group (A) made with normal coarse aggregate and without web reinforcement, the second group (B) made with recycled coarse aggregate (50 %) and without web reinforcement, third group (C) made with recycled coarse aggregate (50 %) and with percentage of web reinforcement 0.26 % and fourth group (D) made with recycled coarse aggregate (50 %) and with percentage of web reinforcement 0.52 %. Test results indicated that, using (RCA) in group (B) leads to decreases in the cracking and ultimate shear strengths by average ratios of 6.04 % and 17.58 % respectively. the increases in (a/d) ratio from (1 to 1.5), (1.5 to 2) and (2 to 2.5) in all groups lead to decreases in ultimate shear strengths by average ratios of 24.42 %, 23.26 % and 15.23 % respectively. The increases in the vertical web reinforcement ratio (pv) from 0 % in group (B) to 0.26 % in group (C) and from 0.26 in group (C)  to 0.51 % in group (D) lead to an increases in the ultimate shear capacity by average ratio of 51.23 % and 15.75 % respectively. The experimental shear capacities of the beams were compared with Zsutty,s equation, Arabzad et al. equation, ACI 318M-14 Code. Zsutty,s equation and ACI 318M-14 Code showed better agreement with the experimental results as compared with the other used  methods.