This research investigates the behavior of circular concretes externally confined by recycled polypropylene fiber ropes-reinforced polymer composite. This study mainly aims to explore the axial stress-strain relationships of recycled polypropylene fiber ropes-reinforced polymer composite-confined circular concrete. A total of 15 circular concrete specimens with a dimension of 150 × 300 mm were cast, strengthened with one to four layers of recycled polypropylene fiber ropes FRP composites, and tested under compression. The strength and the deformability of recycled polypropylene fiber ropes FRP-confined specimens were observed to be increased along with the addition of FRP layers up to 70%. The axial stress-strain relationship behavior shows a trilinear curve response with the ductile behavior of the axial stress-strain response. The recycled polypropylene fiber ropes FRP has been found to be able to alternate the conventional FRP materials to confine circular concrete. The accuracy of stress at ultimate limit and strain at ultimate limit models developed for recycled polypropylene fiber ropes-reinforced polymer composite-confined circular concrete was assessed using the test results of this study, showing the need for the development of improved predictive models for recycled polypropylene fiber ropes FRP composite-confined circular concrete column, newly developed unified models were found to be accurate in predicting the stress at ultimate limit and strain at the ultimate limit of recycled polypropylene fiber ropes FRP composite-confined circular concrete.
- Confined Circular Concrete
- Disaster Risk Reduction
- Recycled Polypropylene Fiber Ropes FRP
- Stress-Strain Behavior