Identification of pitting corrosion in steel bars and rebars embedded in concrete using ultrasonic guided waves

R.C. Sriramadasu, Y. Lu, S. Banerjee

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

2 Citations (Scopus)

Abstract

In this paper ultrasonic guided waves generated by surface bonded piezoelectric wafer transducers (PWTs) are deployed to identify localised corrosion in steel bars, which is simulated in the laboratory using the impressed current method. It is observed that flexural mode F(1,1) has high sensitivity to the corrosion in simple steel bars as well as embedded steel reinforcement bars (rebars). The variation of group velocity of F(1,1) mode for various level corrosion is studied. Group velocity has direct linear correlation with the mass loss in steel bars while corrosion in embedded rebars has a complex nature. However, various phases of corrosion in embedded steel rebars can still be interpreted using the change in wave velocity. Copyright © 2018 by The Hong Kong Institute of Steel Construction.
Original languageEnglish
Title of host publicationProceedings of the 9th International Conference on Advances in Steel Structures, ICASS 2018
PublisherHong Kong Institution of Steel Construction
ISBN (Electronic)978-988991409-7
ISBN (Print)9889914093
Publication statusPublished - 2020

Keywords

  • Corrosion
  • Flexural mode
  • Guided waves
  • Impressed current method
  • Piezoelectric wafer transducers (PWTs)
  • Steel bars

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