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<p>In marine environments, reinforced concrete structures are highly susceptible to chloride-induced corrosion of steel reinforcement, which significantly compromises their durability. Electrochemical chloride extraction (ECE) is an effective technique for reducing corrosion risk and enhancing durability, yet its remedial performance is governed by the coupled effects of loading conditions, material properties, and electrochemical parameters. This study systematically investigates the evolution of concrete durability before and after ECE treatment in flexural reinforced concrete members, with an emphasis on the mechanisms through which water-cement ratio, current density, dechlorination duration, and stress-induced damage influence resistivity and corrosion potential. Experimental results indicate that ECE treatment increased concrete resistivity and shifted the half-cell potential toward a lower corrosion-risk tendency, based on electrochemical indicators. However, chloride removal and reinforcement passivation were inferred rather than directly quantified. Notably, bending loads do not directly influence durability through the duration of load application. However, the load can drive microcrack propagation and pore structure rearrangement, inducing progressive material damage that may modify ion-transport pathways and influence the electrochemical response during ECE. As the extent of damage increases, both resistivity and corrosion potential exhibit enhanced sensitivity to ECE treatment. Furthermore, current density and dechlorination duration synergistically control the overall repair efficacy. Based on the ultrasonic testing results, the damage degree was introduced as a structural state variable to replace the conventional holding time parameter. Half-cell potential was used as an electrochemical indicator to assess the corrosion tendency of the reinforcement, whereas concrete resistivity was selected for model development because it more directly reflects the ionic transport capacity of the concrete matrix. A multi-parameter resistivity evolution model was subsequently developed, incorporating current density as the primary variable, with modifications for water-cement ratio, loading ratio, damage degree, and dechlorination duration. The model showed reasonable consistency with the observed resistivity trends within the tested parameter range, as evaluated through internal comparison with experimental data and an external trend-based consistency check using literature data. This work provides a useful reference framework for the design of electrochemical dechlorination repair strategies and the assessment of durability in reinforced concrete structures.</p>

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Coupled effects of sustained loading ratio and electrochemical chloride extraction parameters on resistivity and half-cell potential of reinforced concrete

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Feng Qu,
  • Tao Lu,
  • Congtao Sun,
  • Gang Peng,
  • Zhi Huang,
  • Gongxun Wang,
  • Feng Chen,
  • Mingqiao Zhu

摘要

In marine environments, reinforced concrete structures are highly susceptible to chloride-induced corrosion of steel reinforcement, which significantly compromises their durability. Electrochemical chloride extraction (ECE) is an effective technique for reducing corrosion risk and enhancing durability, yet its remedial performance is governed by the coupled effects of loading conditions, material properties, and electrochemical parameters. This study systematically investigates the evolution of concrete durability before and after ECE treatment in flexural reinforced concrete members, with an emphasis on the mechanisms through which water-cement ratio, current density, dechlorination duration, and stress-induced damage influence resistivity and corrosion potential. Experimental results indicate that ECE treatment increased concrete resistivity and shifted the half-cell potential toward a lower corrosion-risk tendency, based on electrochemical indicators. However, chloride removal and reinforcement passivation were inferred rather than directly quantified. Notably, bending loads do not directly influence durability through the duration of load application. However, the load can drive microcrack propagation and pore structure rearrangement, inducing progressive material damage that may modify ion-transport pathways and influence the electrochemical response during ECE. As the extent of damage increases, both resistivity and corrosion potential exhibit enhanced sensitivity to ECE treatment. Furthermore, current density and dechlorination duration synergistically control the overall repair efficacy. Based on the ultrasonic testing results, the damage degree was introduced as a structural state variable to replace the conventional holding time parameter. Half-cell potential was used as an electrochemical indicator to assess the corrosion tendency of the reinforcement, whereas concrete resistivity was selected for model development because it more directly reflects the ionic transport capacity of the concrete matrix. A multi-parameter resistivity evolution model was subsequently developed, incorporating current density as the primary variable, with modifications for water-cement ratio, loading ratio, damage degree, and dechlorination duration. The model showed reasonable consistency with the observed resistivity trends within the tested parameter range, as evaluated through internal comparison with experimental data and an external trend-based consistency check using literature data. This work provides a useful reference framework for the design of electrochemical dechlorination repair strategies and the assessment of durability in reinforced concrete structures.