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<p>This study evaluates the flexural behavior and durability of glass fiber-reinforced polymer (GFRP)-reinforced lightweight aggregate concrete (LWAC) beams incorporating Leca aggregates. The performance under freeze–thaw (F–T) and wet–dry (W–D) cyclic exposures was investigated experimentally and numerically. Nonlinear finite element models (NLFEMs) developed in ABAQUS were validated against experimental results. The structural response of GFRP-reinforced Leca LWAC beams was evaluated. This performance was compared against control beams: one group using conventional steel-reinforced Leca LWAC and another using steel-reinforced normal weight concrete, all subjected to identical conditions. Experimental findings indicate high resilience of GFRP-reinforced Leca LWAC to W–D cycles, exhibiting only a ~ 2% reduction in ultimate flexural strength. Conversely, F–T cycling induced a more significant strength degradation of approximately 30% in Leca LWAC beams, irrespective of reinforcement type. Failure analysis revealed that GFRP reinforcement resulted in controlled, ductile flexural failures, contrasting with potential brittle failure modes associated with corroded steel in harsh environments. The validated NLFEM accurately predicted load–deflection responses and failure mechanisms. These results demonstrate the viability of GFRP reinforcement in Leca LWAC for enhanced durability, particularly against moisture-induced degradation, while highlighting the vulnerability of the Leca aggregate concrete itself to F–T damage. The findings contribute essential data for designing durable and sustainable concrete structures utilizing GFRP and Leca LWAC in aggressive environments.</p>

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Flexural Performance and Durability of GFRP-Reinforced Lightweight Aggregate Concrete Beams Utilizing Leca Under Cyclic Environmental Exposure

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Mohammad Amin Fadaie,
  • Ali Dehghanbanadaki

摘要

This study evaluates the flexural behavior and durability of glass fiber-reinforced polymer (GFRP)-reinforced lightweight aggregate concrete (LWAC) beams incorporating Leca aggregates. The performance under freeze–thaw (F–T) and wet–dry (W–D) cyclic exposures was investigated experimentally and numerically. Nonlinear finite element models (NLFEMs) developed in ABAQUS were validated against experimental results. The structural response of GFRP-reinforced Leca LWAC beams was evaluated. This performance was compared against control beams: one group using conventional steel-reinforced Leca LWAC and another using steel-reinforced normal weight concrete, all subjected to identical conditions. Experimental findings indicate high resilience of GFRP-reinforced Leca LWAC to W–D cycles, exhibiting only a ~ 2% reduction in ultimate flexural strength. Conversely, F–T cycling induced a more significant strength degradation of approximately 30% in Leca LWAC beams, irrespective of reinforcement type. Failure analysis revealed that GFRP reinforcement resulted in controlled, ductile flexural failures, contrasting with potential brittle failure modes associated with corroded steel in harsh environments. The validated NLFEM accurately predicted load–deflection responses and failure mechanisms. These results demonstrate the viability of GFRP reinforcement in Leca LWAC for enhanced durability, particularly against moisture-induced degradation, while highlighting the vulnerability of the Leca aggregate concrete itself to F–T damage. The findings contribute essential data for designing durable and sustainable concrete structures utilizing GFRP and Leca LWAC in aggressive environments.