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Cracks in concrete structures are critical indicators of structural deterioration, making accurate depth measurement essential for safety evaluation. This study introduces a concrete crack depth indicator designed to enhance radar reflection by transforming the air-concrete interface into an indicator-concrete interface. Using alkali metal silicate as a base, the indicator is prepared with catalysts, additives, and nanomodifiers, incorporating 5 nm ferric iron tetraoxide powder to achieve a dielectric constant of 278.3—a 243.58% increase compared to distilled water. This results in a 17.64% higher reflection coefficient relative to distilled water and a 29.84% increase compared to air. Crack depths were measured using a handheld radar operating at a center frequency of 2.6 GHz through comparative tests conducted with and without the application of the indicator. Demonstrating its effectiveness in visualizing cracks as narrow as 0.057 mm, with a maximum detection error of 4.5%. These results demonstrate the indicator’s significant improvement in radar-based crack depth assessment and structural integrity evaluation.

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Research on the Indicators and Properties Performance of Radar Visualization in Concrete Crack Depth Detection

  • 会议论文

  • 发表日期：

    2025年

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  • Hui Tian,
  • Lei Tang,
  • Pinzhi Luan,
  • Po Li,
  • Yulei Wang

摘要

Cracks in concrete structures are critical indicators of structural deterioration, making accurate depth measurement essential for safety evaluation. This study introduces a concrete crack depth indicator designed to enhance radar reflection by transforming the air-concrete interface into an indicator-concrete interface. Using alkali metal silicate as a base, the indicator is prepared with catalysts, additives, and nanomodifiers, incorporating 5 nm ferric iron tetraoxide powder to achieve a dielectric constant of 278.3—a 243.58% increase compared to distilled water. This results in a 17.64% higher reflection coefficient relative to distilled water and a 29.84% increase compared to air. Crack depths were measured using a handheld radar operating at a center frequency of 2.6 GHz through comparative tests conducted with and without the application of the indicator. Demonstrating its effectiveness in visualizing cracks as narrow as 0.057 mm, with a maximum detection error of 4.5%. These results demonstrate the indicator’s significant improvement in radar-based crack depth assessment and structural integrity evaluation.