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<p>This study explores the experimental rehabilitation of corroded steel columns with Ultra-High-Performance Concrete (UHPC). Three separate strengthening configurations were tested: encasement with UHPC only, UHPC with shear connectors, and UHPC with bundled reinforcement mesh. Findings show that the axial capacity of the corroded columns strengthened with UHPC was increased by as much as 79% relative to the unstrengthened specimens. The maximal observed ultimate axial capacity was 1789.4 kN. Specimens retrofitted with UHPC demonstrated improved load-bearing performance, decreased strain, and more favourable failure modes than the corroded control specimens. This paper offers a novel approach, an alternative to welding or jacking through a simplified UHPC-repair method, which is more efficient and can be applied on-site. It provides a more practical solution as compared to conventional techniques.</p>

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Performance of corroded steel column and ultra-high-performance concrete composite member under pure axial load

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Amir Mohammad Alizada,
  • Sakhiah Abdul Kudus

摘要

This study explores the experimental rehabilitation of corroded steel columns with Ultra-High-Performance Concrete (UHPC). Three separate strengthening configurations were tested: encasement with UHPC only, UHPC with shear connectors, and UHPC with bundled reinforcement mesh. Findings show that the axial capacity of the corroded columns strengthened with UHPC was increased by as much as 79% relative to the unstrengthened specimens. The maximal observed ultimate axial capacity was 1789.4 kN. Specimens retrofitted with UHPC demonstrated improved load-bearing performance, decreased strain, and more favourable failure modes than the corroded control specimens. This paper offers a novel approach, an alternative to welding or jacking through a simplified UHPC-repair method, which is more efficient and can be applied on-site. It provides a more practical solution as compared to conventional techniques.