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Half-cell potential mapping is a widely recognized technique for detecting corrosion in reinforced concrete structures. Initially introduced in the 1970s, the method has evolved with incremental improvements, such as multi-rod arrays and wheel-electrode systems, to increase measurement efficiency. Despite these advancements, direct physical contact between the electrode and the concrete surface remains a key limitation, particularly for rapid or large-area inspections. This paper presents a novel, contactless approach to half-cell potential mapping using a controlled water jet. The measured half-cell potentials showed good agreement with the conventional method, remaining within ± 2 mV at comparable locations. Further, systematic experiments with varying nozzle diameters (2–5 mm) and orientations (horizontal, downward, and upward) demonstrated that stable measurements can be achieved at distances up to 22.5 cm. However, achieving longer distances requires higher flow rates and higher diameters, highlighting a trade‐off between water consumption and data quality. While these findings were obtained under controlled laboratory conditions, the results suggest promising potential for rapid, contactless corrosion assessment of reinforced concrete in the field.

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Measurement of Half-Cell Potentials Without Physical Contact with the Concrete Surface

  • 会议论文

  • 发表日期：

    2026年

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  • Patrick Pfändler,
  • Gabriel Bühler,
  • Ola Berg Edseth,
  • Lukas Bircher,
  • Federico Martinelli-Orlando,
  • Ueli Angst

摘要

Half-cell potential mapping is a widely recognized technique for detecting corrosion in reinforced concrete structures. Initially introduced in the 1970s, the method has evolved with incremental improvements, such as multi-rod arrays and wheel-electrode systems, to increase measurement efficiency. Despite these advancements, direct physical contact between the electrode and the concrete surface remains a key limitation, particularly for rapid or large-area inspections. This paper presents a novel, contactless approach to half-cell potential mapping using a controlled water jet. The measured half-cell potentials showed good agreement with the conventional method, remaining within ± 2 mV at comparable locations. Further, systematic experiments with varying nozzle diameters (2–5 mm) and orientations (horizontal, downward, and upward) demonstrated that stable measurements can be achieved at distances up to 22.5 cm. However, achieving longer distances requires higher flow rates and higher diameters, highlighting a trade‐off between water consumption and data quality. While these findings were obtained under controlled laboratory conditions, the results suggest promising potential for rapid, contactless corrosion assessment of reinforced concrete in the field.