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<p>Effective bonding between existing concrete and newly placed concrete is crucial for repairing deteriorated reinforced concrete structures. This study investigates the bond behavior at the interface of substrate and overlay concrete using mechanical connectors and a styrene–butadiene rubber (SBR-200) bonding agent. Four configurations were tested: (i) roughened surface (control), (ii) SBR-200 bonding agent only, (iii) mechanical connector only, and (iv) both the SBR-200 bonding agent and mechanical connector. Composite specimens were tested to evaluate their performance through split tensile, bi-surface shear, slant shear, and push-off shear tests. Condition (iv) outperformed all other conditions, attaining the maximum bond strengths in the split tensile (0.43&#xa0;MPa), bi-surface shear (2.97&#xa0;MPa), slant shear (7.27&#xa0;MPa), and push-off (3.01&#xa0;MPa) tests. This superior performance is a result of the SBR’s chemical adhesion and the connectors’ mechanical interlock, which together improved resistance to shear failure, tensile separation, and slippage. Furthermore, the failure modes of all four bonding conditions were investigated at the macro-level by using these four tests. The combination of SBR-200 and shear connectors offered more complicated failure patterns, indicating enhanced interfacial bonding, which signifies a high potential for structural repair applications. In conclusion, condition (iv) combination has high potential for use in structural concrete repairs, particularly for structural members subjected to both tensile and shear stresses. This research provides insights for optimizing repair strategies and selection of appropriate configurations in composite concrete systems that may be under tensile, shear, or shear-normal stresses.</p>

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Experimental evaluation of bond performance between substrate and overlay concrete using bonding agents and mechanical connectors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月18日

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  • Muhammad Afaq Khan,
  • Sana Shahid,
  • Muhammad Sheraz,
  • Sami Ullah,
  • Azaz Ahmad,
  • Muhammad Umair,
  • Abdul Qadir Bhatti,
  • Furqan Ahmad

摘要

Effective bonding between existing concrete and newly placed concrete is crucial for repairing deteriorated reinforced concrete structures. This study investigates the bond behavior at the interface of substrate and overlay concrete using mechanical connectors and a styrene–butadiene rubber (SBR-200) bonding agent. Four configurations were tested: (i) roughened surface (control), (ii) SBR-200 bonding agent only, (iii) mechanical connector only, and (iv) both the SBR-200 bonding agent and mechanical connector. Composite specimens were tested to evaluate their performance through split tensile, bi-surface shear, slant shear, and push-off shear tests. Condition (iv) outperformed all other conditions, attaining the maximum bond strengths in the split tensile (0.43 MPa), bi-surface shear (2.97 MPa), slant shear (7.27 MPa), and push-off (3.01 MPa) tests. This superior performance is a result of the SBR’s chemical adhesion and the connectors’ mechanical interlock, which together improved resistance to shear failure, tensile separation, and slippage. Furthermore, the failure modes of all four bonding conditions were investigated at the macro-level by using these four tests. The combination of SBR-200 and shear connectors offered more complicated failure patterns, indicating enhanced interfacial bonding, which signifies a high potential for structural repair applications. In conclusion, condition (iv) combination has high potential for use in structural concrete repairs, particularly for structural members subjected to both tensile and shear stresses. This research provides insights for optimizing repair strategies and selection of appropriate configurations in composite concrete systems that may be under tensile, shear, or shear-normal stresses.