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<p>Need of a sustainable and eco-friendly environment has diverted the focus of the construction industry towards the use of sustainable and recyclable construction materials. Among these materials, Recycled Aggregate Concrete (RAC) has gained popularity amid the construction industry and researchers. As key structural elements, columns often bear eccentric loads, making their behavior critical for overall structural stability and safe load transfer. The study, presented herein, therefore, focuses on investigating both experimentally and numerically, the behavior of the Reinforced Concrete (RC) columns cast with Natural Aggregate Concrete (NAC) and RAC under eccentric loading, focusing on the effects of varying longitudinal steel ratios and Near Surface Mounted (NSM) strengthening with Carbon Fibre Reinforced Polymer (CFRP) and steel bars. Results indicate that well-designed column-corbel intersections can prevent premature failure and enhance load capacity. Numerical results showed ACI predictions to be conservative for columns with higher longitudinal reinforcement. NAC exhibited superior ductility, while the use of CFRP-NSM bars effectively strengthened RAC and damaged RC columns, achieving improvements ranging from 14 to 103%. These findings emphasize the potential of the NSM method for improving the performance of recycled aggregate concrete and retrofitting damaged structures for sustainable construction. Results of this investigation will benefit in the advancement of the sustainable and cost-effective solutions for the construction industry by utilizing RAC and CFRP-NSM bars, without compromising on the structural performance of columns under eccentric loads.</p>

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Simulation of Recycled Aggregate RC Columns Under Eccentric Loads Strengthened with Near-Surface Mounted Steel and CFRP Bars

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Shamsoon Fareed,
  • Laiba Ayub,
  • Asad-ur-Rehman Khan

摘要

Need of a sustainable and eco-friendly environment has diverted the focus of the construction industry towards the use of sustainable and recyclable construction materials. Among these materials, Recycled Aggregate Concrete (RAC) has gained popularity amid the construction industry and researchers. As key structural elements, columns often bear eccentric loads, making their behavior critical for overall structural stability and safe load transfer. The study, presented herein, therefore, focuses on investigating both experimentally and numerically, the behavior of the Reinforced Concrete (RC) columns cast with Natural Aggregate Concrete (NAC) and RAC under eccentric loading, focusing on the effects of varying longitudinal steel ratios and Near Surface Mounted (NSM) strengthening with Carbon Fibre Reinforced Polymer (CFRP) and steel bars. Results indicate that well-designed column-corbel intersections can prevent premature failure and enhance load capacity. Numerical results showed ACI predictions to be conservative for columns with higher longitudinal reinforcement. NAC exhibited superior ductility, while the use of CFRP-NSM bars effectively strengthened RAC and damaged RC columns, achieving improvements ranging from 14 to 103%. These findings emphasize the potential of the NSM method for improving the performance of recycled aggregate concrete and retrofitting damaged structures for sustainable construction. Results of this investigation will benefit in the advancement of the sustainable and cost-effective solutions for the construction industry by utilizing RAC and CFRP-NSM bars, without compromising on the structural performance of columns under eccentric loads.