Influence of aggregate and inclusion size on ultrasonic tomography in concrete

Lu Zhang; Shangda Jia; Chong Qiao; Zishi Jiang; Hongyu Li

doi:10.1117/12.2657623

18 April 2023 Influence of aggregate and inclusion size on ultrasonic tomography in concrete

Lu Zhang, Shangda Jia, Chong Qiao, Zishi Jiang, Hongyu Li

Proceedings Volume 12487, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII; 1248715 (2023) https://doi.org/10.1117/12.2657623
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

Abstract

Currently, ultrasonic testing (UT) is widely used in concrete for identifying the sub-surface or surface flaws. However, most the UT can only provide the qualitive evaluation of the flaws. Tomography technology is capable to visualize the damage and provide its positioning information in concrete by reconstructing the ultrasound. For example, the slurry leakage state in the grouting sleeve, and the location of the inclusion in the concrete pile foundation can be displayed by ultrasonic tomography. However, concrete material is highly heterogenous due to its complex components (aggregate, mortar, internal void). All those complexities can cause significant impact on the tomographic results. Especially for the aggregate, sometimes its dimension is very closed to the testing objects. It greatly affects the recognition and location of defects by ultrasonic testing. Therefore, this research proposed to reveal the influence of aggregate, defect size and the effect of type, tomographic pixels on tomographic images in concrete. An optimum transducer arrangement and tomography algorithms in terms of ray-trace method was proposed to achieve the high accurate and resolution of tomography. Finally, the comparison of tomographic images between the imaged location and the embedded location is evaluated and then tomographic states is assessed accordingly.

Citation Download Citation

Lu Zhang, Shangda Jia, Chong Qiao, Zishi Jiang, and Hongyu Li "Influence of aggregate and inclusion size on ultrasonic tomography in concrete", Proc. SPIE 12487, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII, 1248715 (18 April 2023); https://doi.org/10.1117/12.2657623

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KEYWORDS

Ultrasonics

Tomography

Acoustic tomography

Transducers

Ultrasound transducers

Reflection

Transmitters

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