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<p>This study investigates the flexural behavior of M50-grade concrete reinforced with Glass Fiber Reinforced Polymer (GFRP) rebars, focusing on their performance in structurally hostile environments. GFRP rebars are increasingly favored over traditional steel reinforcement due to their superior corrosion resistance, addressing durability challenges associated with steel corrosion in aggressive conditions. The experimental program evaluates the mechanical performance of GFRP-reinforced beams, emphasizing load–deflection characteristics and failure loads. Three groups of RC beams were analyzed: beams fully reinforced with steel, fully reinforced with GFRP rebars, and hybrid beams combining both types. Steel and polypropylene fibers were incorporated into the concrete matrix in varying proportions (0%, 0.5%, 1.0%, and 1.5%) to enhance composite action and ductility. Two reinforcement diameters (8&#xa0;mm and 10&#xa0;mm) were selected to assess the influence of bar size on load-bearing capacity and deflection behavior. The results indicate that beams reinforced entirely with GFRP rebars exhibit enhanced corrosion resistance and significant ductility, while hybrid reinforcement combinations achieve an optimal balance between strength and deflection performance. Fiber addition up to 1.0% consistently enhanced flexural strength and energy absorption, with diminishing returns observed at higher fiber contents (1.5%) due to potential fiber clustering. Larger reinforcement diameters (10&#xa0;mm) contributed to higher load capacities, while smaller diameters (8&#xa0;mm) provided better deflection performance. These findings underscore the importance of optimizing fiber content and reinforcement configurations to improve flexural performance while maintaining structural integrity and durability in corrosive environments. The study offers valuable insights for developing flexural strength prediction models and guiding the design of durable concrete structures for aggressive conditions.</p>

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Effect of hybrid fiber and hybrid rebars on flexural strength of reinforced concrete beams

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • R. Rajkumar,
  • Abhay Yadav,
  • C. Arunkumar

摘要

This study investigates the flexural behavior of M50-grade concrete reinforced with Glass Fiber Reinforced Polymer (GFRP) rebars, focusing on their performance in structurally hostile environments. GFRP rebars are increasingly favored over traditional steel reinforcement due to their superior corrosion resistance, addressing durability challenges associated with steel corrosion in aggressive conditions. The experimental program evaluates the mechanical performance of GFRP-reinforced beams, emphasizing load–deflection characteristics and failure loads. Three groups of RC beams were analyzed: beams fully reinforced with steel, fully reinforced with GFRP rebars, and hybrid beams combining both types. Steel and polypropylene fibers were incorporated into the concrete matrix in varying proportions (0%, 0.5%, 1.0%, and 1.5%) to enhance composite action and ductility. Two reinforcement diameters (8 mm and 10 mm) were selected to assess the influence of bar size on load-bearing capacity and deflection behavior. The results indicate that beams reinforced entirely with GFRP rebars exhibit enhanced corrosion resistance and significant ductility, while hybrid reinforcement combinations achieve an optimal balance between strength and deflection performance. Fiber addition up to 1.0% consistently enhanced flexural strength and energy absorption, with diminishing returns observed at higher fiber contents (1.5%) due to potential fiber clustering. Larger reinforcement diameters (10 mm) contributed to higher load capacities, while smaller diameters (8 mm) provided better deflection performance. These findings underscore the importance of optimizing fiber content and reinforcement configurations to improve flexural performance while maintaining structural integrity and durability in corrosive environments. The study offers valuable insights for developing flexural strength prediction models and guiding the design of durable concrete structures for aggressive conditions.