Impact of Elevated Temperatures on the Mechanical Properties of GFRP Bars in RC One-Way Slab: A Review
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Abstract
This study investigates the impact of elevated temperatures on the mechanical properties of Glass Fiber Reinforced Polymer (GFRP) bars as reinforcement in reinforced concrete (RC) one-way slab. GFRP bars are increasingly used in construction due to their superior corrosion resistance and strength to weight ratio, but their performance under fire exposure remains a critical concern. The study examines how temperatures above 100°C degrade the tensile strength and bond strength of GFRP with concrete, with significant losses occurring at temperatures above 300°C. The effects of fire on concrete, such as moisture loss, spalling, and strength reduction, are also discussed. Researches findings show that increased concrete cover and anchorage length improve fire resistance, with failures typically occurring at around 500°C due to GFRP bar rupture. Furthermore, GFRP-reinforced slabs exhibit better ductility and safety factors compared to steel reinforced slabs under cyclic loading, though they suffer from stiffness degradation. The review highlights the need for further research to develop advanced fire-resistant GFRP composites and better predictive models for the performance of GFRP-reinforced structures in fire-prone environments. Ultimately, GFRP bars offer promising solutions in corrosion-prone areas but require careful consideration for fire resistance and long-term performance in high-temperature applications
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