To attain sustainable development there is an increasing need of appropriate substitute materials of concrete ingredients such as coarse aggregates. The main aspiration of this effort is to produce the concrete using recycled concrete aggregates derived from construction and demolition (C&D) waste. As such, the use of recycled aggregate concrete (RAC) in structural elements becomes absolutely essential. A series of solid and hollow RAC beams were tested experimentally and simulated under torsional load to compared with natural aggregate concrete (NAC) beams. All tested solid and hollow beams of size, 150 mm wide x 250 mm depth x 1800 mm length with 50 mm x 150 mm opening for hollow beam, which composed of recycled concrete aggregate with replacement ratios of 0%, 50%, and 100%. The torsional capacity of hollow beams was found only lower by 5.49 %, 6.69 % and 8.67 % than the experimental solid beams in test results. The simulation results yielded similar trends, with reductions of 7.52%, 7.90%, and 8.26% in the torsional capacity of hollow beams compared to solid beams. The observed torsional parameter of beams such as crack pattern, torsional ability and twisting angle were found comparable with FE analysis. The findings of this study reveal that RAC beams, whether solid or hollow, possess sufficient torsional capacity and structural integrity, as good as to that of NAC beams. This suggests that RAC can be effectively utilized in structural applications subjected to torsional loads.
