Structural Behaviour of Polystyrene Foam Lightweight Concrete Beams Strengthened with FRP Laminates

Abstract Lightweight concrete (LWC) is one of the most important building materials nowadays. Many research studies were focused on LWC produced using lightweight aggregates. However, limited work was cited for polystyrene beads. In this study, beams strengthened with carbon fibre reinforced polymer (CFRP) and glass (GFRP) experimentally tested to investigate improvement in their flexural shear behaviours. investigation achieved by partial replacement normal aggregate beads resulted approximately 30% less weight compared Normal concrete. Fourteen Reinforced Concrete (RC) 100 mm 300 cross section having an overall length 3250 under four-point bending. These designed, detailed, obtain mode failure. divided into two groups based intended failure mode. each group, six CFRP GFRP laminates, while remaining beam used as control. The parameters type FRP, width laminates strengthening, number layers strengthening. It found that strengthening increasing loading capacity decreasing deflection also suitable reducing crack propagation which more significant beams. experimental results expressions codes forecasting strength it these are compatible results.