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<p>This study investigates the effectiveness of near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) ropes and strips in repairing self-compacting concrete (SCC) slabs with circular openings subjected to severe thermal damage (500&#xa0;° C for 3&#xa0;h). Eight strengthening layouts: circular, square, and hybrid rope/strip arrangements, were evaluated against both unheated and heat-damaged control slabs. Thermal exposure reduced load capacity by 52%. NSM-CFRP repair schemes significantly restored performance, with the hybrid circular and square rope layout achieving the highest improvement, increasing ultimate load by 163% compared to the heat-damaged control and exceeding the unheated reference slab. While square-rope systems maximized strength, they reduced ductility due to shear-dominated failure, whereas circular confinement maintained higher deformation capacity. The results demonstrate that NSM-CFRP hybrid layouts provide the most balanced enhancement of strength, stiffness, and ductility for heat-damaged slabs with opening. Failure modes shifted from flexural to shear depending on CFRP layout, with square configurations promoting shear resistance. The study also highlights the cost-effectiveness of various repair strategies, with the hybrid configuration proving both structurally superior and economically viable. These findings provide valuable insights for the repair and strengthening of thermally degraded SCC slabs with openings.</p>

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Performance of Repaired Heat-Damaged SCC Slabs with Circular Opening Using NSM-CFRP Strips/Ropes

  • 期刊论文

  • 发表日期：

    2026年2月11日

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  • Ala’ Taleb Obaidat,
  • Yasmeen Taleb Obaidat,
  • M. Ahmed Ashteyat,
  • Abdallah Odeibat

摘要

This study investigates the effectiveness of near-surface mounted (NSM) carbon fiber reinforced polymer (CFRP) ropes and strips in repairing self-compacting concrete (SCC) slabs with circular openings subjected to severe thermal damage (500 ° C for 3 h). Eight strengthening layouts: circular, square, and hybrid rope/strip arrangements, were evaluated against both unheated and heat-damaged control slabs. Thermal exposure reduced load capacity by 52%. NSM-CFRP repair schemes significantly restored performance, with the hybrid circular and square rope layout achieving the highest improvement, increasing ultimate load by 163% compared to the heat-damaged control and exceeding the unheated reference slab. While square-rope systems maximized strength, they reduced ductility due to shear-dominated failure, whereas circular confinement maintained higher deformation capacity. The results demonstrate that NSM-CFRP hybrid layouts provide the most balanced enhancement of strength, stiffness, and ductility for heat-damaged slabs with opening. Failure modes shifted from flexural to shear depending on CFRP layout, with square configurations promoting shear resistance. The study also highlights the cost-effectiveness of various repair strategies, with the hybrid configuration proving both structurally superior and economically viable. These findings provide valuable insights for the repair and strengthening of thermally degraded SCC slabs with openings.