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Corrosion-induced deterioration of steel bars in concrete structures severely compromises load-carrying capacity, posing serious structural safety concerns in aging infrastructure. This study investigates a hybrid strengthening approach integrating Near-Surface Mounted Carbon Fiber-Reinforced Polymer (NSM-CFRP) strips with high-strength Strain-Hardening Cementitious Composites (SHCC) to restore the load-carrying capacity of severely corroded reinforced concrete (RC) members. The effect of CFRP bond lengths (6D, 8D, 10D, and 12D, where D is steel bar diameter) on the load-carrying capacity were experimentally evaluated under direct tension. Results indicate that increasing the bond length enhances load-carrying capacity and influences failure modes. The control specimen (without CFRP) exhibited failed in tensile mode at a peak load of 114.58 kN. Specimens with embedded CFRP strips demonstrated improved performance, with the 12D configuration achieving a peak load of 166.80 kN, approaching the yield capacity of a full-section steel bar (171 kN). Despite this, failure modes transitioned to interfacial splitting at longer bond lengths, underscoring the interplay between bond length and material volume in optimizing CFRP effectiveness. The hybrid NSM-CFRP/SHCC system not only restores load capacity but also enhances durability through superior crack control and stress redistribution. These results validate the technique’s potential as a robust, corrosion-resistant solution for rehabilitating corroded RC members.

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Improving Load-Carrying Capacity of Corroded Steel Bars with Near-Surface Mounted CFRP and High-Strength SHCC

  • 会议论文

  • 发表日期：

    2026年

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  • Haroon Younas,
  • Jing Yu,
  • Christopher K. Y. Leung

摘要

Corrosion-induced deterioration of steel bars in concrete structures severely compromises load-carrying capacity, posing serious structural safety concerns in aging infrastructure. This study investigates a hybrid strengthening approach integrating Near-Surface Mounted Carbon Fiber-Reinforced Polymer (NSM-CFRP) strips with high-strength Strain-Hardening Cementitious Composites (SHCC) to restore the load-carrying capacity of severely corroded reinforced concrete (RC) members. The effect of CFRP bond lengths (6D, 8D, 10D, and 12D, where D is steel bar diameter) on the load-carrying capacity were experimentally evaluated under direct tension. Results indicate that increasing the bond length enhances load-carrying capacity and influences failure modes. The control specimen (without CFRP) exhibited failed in tensile mode at a peak load of 114.58 kN. Specimens with embedded CFRP strips demonstrated improved performance, with the 12D configuration achieving a peak load of 166.80 kN, approaching the yield capacity of a full-section steel bar (171 kN). Despite this, failure modes transitioned to interfacial splitting at longer bond lengths, underscoring the interplay between bond length and material volume in optimizing CFRP effectiveness. The hybrid NSM-CFRP/SHCC system not only restores load capacity but also enhances durability through superior crack control and stress redistribution. These results validate the technique’s potential as a robust, corrosion-resistant solution for rehabilitating corroded RC members.