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This study investigates the use of Externally Bonded Carbon Fibre Reinforced Polymer (EB-CFRP) to strengthen severely deteriorated underground vaults, a practical approach for rehabilitating aging infrastructure. Unlike prior studies that focused on laboratory-based specimens, this research uniquely utilizes actual vault specimens extracted from downtown Calgary, which have experienced significant construction defects and long-term corrosion. Five specimens obtained from the actual vaults were tested under flexure loadings to evaluate the effectiveness of CFRP sheets and plates in strengthening these deteriorated underground structures. Different Externally Bonded Carbon Fibre Reinforced Polymer (EB-CFRP) strengthening systems were used to assess their effectiveness. Two specimens were strengthened using EB-CFRP sheets and two with EB-CFRP plates, while one unstrengthened specimen served as a control. The results indicated that both CFRP sheets and plates substantially increased the flexural strength, stiffness, and load-bearing capacity of the vaults. Strengthened specimens exhibited delayed crack initiation, reduced deflections under load, and increased ultimate load capacities by up to 247% compared to the unstrengthened control, showcasing the effectiveness of CFRP in addressing significant structural deficiencies. This study contributes new insights into the performance of EB-CFRP strengthening under real-world deterioration conditions, highlighting its practical viability for underground infrastructure rehabilitation.

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Enhancing Flexural Capacity of Aged Underground Vaults with Externally Bonded Carbon Fiber-Reinforced Polymer Sheets

  • 会议论文

  • 发表日期：

    2026年

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  • Oumaima Awassa,
  • Raafat El-Hacha

摘要

This study investigates the use of Externally Bonded Carbon Fibre Reinforced Polymer (EB-CFRP) to strengthen severely deteriorated underground vaults, a practical approach for rehabilitating aging infrastructure. Unlike prior studies that focused on laboratory-based specimens, this research uniquely utilizes actual vault specimens extracted from downtown Calgary, which have experienced significant construction defects and long-term corrosion. Five specimens obtained from the actual vaults were tested under flexure loadings to evaluate the effectiveness of CFRP sheets and plates in strengthening these deteriorated underground structures. Different Externally Bonded Carbon Fibre Reinforced Polymer (EB-CFRP) strengthening systems were used to assess their effectiveness. Two specimens were strengthened using EB-CFRP sheets and two with EB-CFRP plates, while one unstrengthened specimen served as a control. The results indicated that both CFRP sheets and plates substantially increased the flexural strength, stiffness, and load-bearing capacity of the vaults. Strengthened specimens exhibited delayed crack initiation, reduced deflections under load, and increased ultimate load capacities by up to 247% compared to the unstrengthened control, showcasing the effectiveness of CFRP in addressing significant structural deficiencies. This study contributes new insights into the performance of EB-CFRP strengthening under real-world deterioration conditions, highlighting its practical viability for underground infrastructure rehabilitation.