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<p>High-energy X-rays are expected to probe the internal structure of the bridge, which uses many prestressed rods to enhance its load-bearing capacity. Due to the different attenuation capabilities of X-rays, changes in materials can be effectively identified. In the study, a concrete bridge model with two sheaths was used to investigate their projection characteristics under different offset distances of an X-ray source. Significant background noise existed in the original X-ray images, and a self-developed python code effectively reduced such inhomogeneous background. The processed images clearly revealed the profile change at different offsets of the sample. Both experimental and numerical results indicate that as the offset increases, the projection widths of the rod and sheath structure expand while the image intensity decreases. The expanded projection width increases the distance between different features on the projection image, thereby facilitating their recognition. Thus, the largest offset of 7.5&#xa0;cm was further used to study the projection characteristics of different rod-inserted cases. In addition to the background reduction methods mentioned previously, additional filtering methods were employed to aid in identifying the sheath for rod-inserting cases. Both the filtered results and numerical results showed the sheath positions were the same regardless of rod inserting or not. Further comparison on single projection inserted at different sheaths, the distance from X-ray to rod affects the projection width, which will be helpful in evaluating depth information of a certain rod in bridges.</p>

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Non-destructive characterization of grouted tendon ducts in bridge structures via high-energy X-ray imaging

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Zhenjun Li,
  • Akio Sugita,
  • Masahiro Abe,
  • Shuichi Hasegawa

摘要

High-energy X-rays are expected to probe the internal structure of the bridge, which uses many prestressed rods to enhance its load-bearing capacity. Due to the different attenuation capabilities of X-rays, changes in materials can be effectively identified. In the study, a concrete bridge model with two sheaths was used to investigate their projection characteristics under different offset distances of an X-ray source. Significant background noise existed in the original X-ray images, and a self-developed python code effectively reduced such inhomogeneous background. The processed images clearly revealed the profile change at different offsets of the sample. Both experimental and numerical results indicate that as the offset increases, the projection widths of the rod and sheath structure expand while the image intensity decreases. The expanded projection width increases the distance between different features on the projection image, thereby facilitating their recognition. Thus, the largest offset of 7.5 cm was further used to study the projection characteristics of different rod-inserted cases. In addition to the background reduction methods mentioned previously, additional filtering methods were employed to aid in identifying the sheath for rod-inserting cases. Both the filtered results and numerical results showed the sheath positions were the same regardless of rod inserting or not. Further comparison on single projection inserted at different sheaths, the distance from X-ray to rod affects the projection width, which will be helpful in evaluating depth information of a certain rod in bridges.