Experimental Study of Self-Compacting Reinforced Concrete Hollow Beams Using Recycled Aggregate under Torsion

This research work aims to investigate experimentally the torsional behaviour of self- compacting reinforced concrete hollow beams with recycled concrete aggregate. Twelve beams were cast and tested. The beams have the same dimensions, and the variables that were investigated include, recycled aggregate content, longitudinal reinforcement, and transverse reinforcement. The test results revealed that for all beams no significant difference in behaviour was identified when comparing beams with recycled aggregate with those with normal aggregate. All the beams exhibited almost similar linear torque- rotation behaviour, but beams with RCA showed lower cracking torque and the twist angle depended on the replacement ratio of RCA. Beams without any reinforcement failed suddenly and separated into two parts, while beams with longitudinal bars showed brittle torsional failure, beams with both longitudinal and transverse reinforcement showed an increasing post-cracking behaviour with the formation of an increase in the number of helical and diagonal cracks.