Behavior of hybrid natural fiber reinforced polymers bars under uniaxial tensile strength and pull-out loads with UHPC

• Published in: Case Studies in Construction Materials 2024-12, Vol.21, p.e03442, Article e03442
• Main Authors: Attia, Mohammed M., Olwan, Mahmoud Malek, Amoush, Essam, Aamer, Shady Rizk Ragheb Hassan, Eita, M.A.
• Format: Article
• Language: English
• Subjects: GFRP; Hybrid fiber; Natural fiber; Pull-out strength; UHPC
• ISSN: 2214-5095; 2214-5095
• DOI: 10.1016/j.cscm.2024.e03442

This study evaluated the uniaxial tensile strength and bond performance of natural hybrid reinforcement bars. Hybrid FRP combines multiple fibers and matrixes, resulting in a desirable performance. Two types of hybrid bars were tested: one with natural fibers surrounded by glass fiber, and the other with a steel core surrounded by natural fiber and then glass fiber. Thirteen samples were used to assess tensile behavior, with four groups including glass fiber, flax, sisal, and jute fibers. Pull-out behavior testing was conducted on twelve samples, divided into four groups of fiberglass, flax, sisal, and jute. Each group used three types of concrete: normal, high strength, and ultra-high-performance concrete (UHPC). The results refer to flax samples that had a higher tensile strength and elastic modulus of 143 MPa and 38 GPa, respectively, than samples made of sisal and jute fibres. The hybrid bars with a steel core exhibited a significant improvement in elastic modulus of 206 % in compared to samples made solely from glass, sisal, and jute fibers. On the other hand, the samples with UHPC showed the highest bond strength. The sample U-GFRP with ultra-high-performance concrete showed the highest bond strength 9.32 MPa, while the sample N-GFRP with normal concrete showed the lowest bond strength 5.87 MPa, respectively. However, this study suggests that hybridizing natural fibers can be a cost-effective and eco-friendly alternative to synthetic fibers.