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Research on quantitative detection method of internal cracks in concrete based on
ultrasonic plane wave imaging

1 1，2 1 1，2 1，2 1，2，3

SUN Linyuan ，HUANG Hao ，LIU Yang ，ZHEN Li ，ZHANG Xinmiao ，CHEN Gaixin

（1. China Institute of Water Resources and Hydropower Research，Beijing 100038，China；

2. State Key Laboratory of Water Cycle and Water Security，Beijing 100038，China；

3. Key Laboratory of Engineering Materials of Ministry of Water Resources，Beijing 100038，China）

Abstract：This paper proposes an angle-corrected compound plane wave imaging method to address the issues of
strong artifacts and poor accuracy in crack angle detection associated with traditional compound plane wave imaging
methods when detecting internal cracks in concrete. First，finite element simulations of ultrasonic detection of inter⁃

nal cracks in concrete microstructure models were conducted. Subsequently，the detection mechanisms and identifica⁃
tion effects of the traditional compound plane wave imaging method and the proposed angle-corrected method were
compared and analyzed. Quantitative identification criteria for internal crack angles and lengths were provided，and

the validity of the proposed method was demonstrated. Finally，the effects of aggregate size，concrete wave velocity，

and crack depth on the angle-corrected compound plane wave imaging method were analyzed. The results indicate
that the proposed method offers better detection performance. Although an increase in aggregate size can affect the
identification accuracy of the method，the impact is minimal. The method maintains good identification performance

even when the crack depth exceeds 10 cm. This study provides a theoretical basis for the quantitative detection of
internal cracks in concrete in practical engineering applications.

Keywords：internal cracks in concrete；meso-structure；angle correction；plane wave imaging；image recognition

（责任编辑：韩 昆）
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