Behaviour of recycled brick aggregate concrete-filled FRP tubes under axial compression
Year: 2025
Type: article
Abstract: Recycled brick aggregates (RBAs) from construction waste present a sustainable alternative to natural aggregates (NAs) in concrete; however, recycled brick aggregate concrete (RBAC) typically exhibits lower stiffness and strength compared to normal concrete (NC). This study investigates the axial compression behaviour of RBAC-filled fibre-reinforced polymer (FRP) tubes (RBACFFTs) to evaluate the contribution of FRP confinement in improving mechanical performance. A total of 70 cylinders were tested to examine the effects of RBAs on concrete properties and FRP confinement effectiveness. The test results indicate that the incorporation of RBAs alters crack propagation patterns and compromises mechanical properties, while this reduction can be effectively mitigated by restricting the replacement ratio. FRP confinement significantly enhances both the load-bearing capacity and deformability of RBAC. However, the confinement effectiveness progressively diminishes as the replacement ratio increases. Within the tested diameter range (up to 300 mm), neither RBAC nor RBACFFTs exhibited notable size effect, thus eliminating the need for size correction factors in analytical models. The confinement effectiveness coefficient in Jiang and Teng’s model was modified to account for the effect of the RBA replacement ratio. The revised model accurately predicts the stress–strain responses of RBACFFTs.
Authors: Z.Y. Xia, X.M. Wang, T. Jiang, G.M. Chen
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,540
Award: G724129438
OpenAlex ID: W4414093929