Smart Structures and Systems

  • 제17권1호
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  • Pages.31-43
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  • 2016
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Air-coupled ultrasonic tomography of solids: 2 Application to concrete elements

  • Hall, Kerry S. (Department of Engineering, University of Southern Indiana) ;
  • Popovics, John S. (Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign)
  • 투고 : 2014.02.12
  • 심사 : 2014.10.29
  • 발행 : 2016.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

Applications of ultrasonic tomography to concrete structures have been reported for many years. However, practical and effective application of this tool for nondestructive assessment of internal concrete condition is hampered by time consuming transducer coupling that limits the amount of ultrasonic data that can be collected. This research aims to deploy recent developments in air-coupled ultrasonic measurements of solids, described in Part 1 of this paper set, to concrete in order to image internal inclusions. Ultrasonic signals are collected from concrete samples using a fully air-coupled (contactless) test configuration. These air coupled data are compared to those collected using partial semi-contact and full-contact test configurations. Two samples are considered: a 150 mm diameter cylinder with an internal circular void and a prism with $300mm{\times}300mm$ square cross-section that contains internal damaged regions and embedded reinforcement. The heterogeneous nature of concrete material structure complicates the application and interpretation of ultrasonic measurements and imaging. Volumetric inclusions within the concrete specimens are identified in the constructed velocity tomograms, but wave scattering at internal interfaces of the concrete disrupts the images. This disruption reduces defect detection accuracy as compared with tomograms built up of data collected from homogeneous solid samples (PVC) that are described in Part 1 of this paper set. Semi-contact measurements provide some improvement in accuracy through higher signal-to-noise ratio while still allowing for reasonably rapid data collection.

키워드

참고문헌

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피인용 문헌

  1. Integrated visualization for reinforced concrete using ultrasonic tomography and image-based 3-D reconstruction vol.123, 2016, https://doi.org/10.1016/j.conbuildmat.2016.07.010
  2. Multiple crack evaluation on concrete using a line laser thermography scanning system vol.22, pp.2, 2016, https://doi.org/10.12989/sss.2018.22.2.201
  3. A New Ultrasonic Amplitude Tomography Approach, with Validation on Masonry Tuff Blocks vol.39, pp.3, 2020, https://doi.org/10.1007/s10921-020-00693-2