Modification of the zero group velocity (impact echo) resonance frequency in the presence of voids for the inspection of tendon ducts

O. Abraham, J. S. Popovics, L. M. Cottineau

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Non-destructive testing of the civil engineering infrastructure for diagnosis, residual service life estimation and/or structural health monitoring, is increasing in importance and need. For example, post-tensioned concrete bridges may be subject to sudden collapse due to tendon breakage. In France, tendon ducts are currently investigated with gamma ray radiometry, but alternative non ionizing techniques are currently sought. Since the mid-nineties, the impact echo method has been proposed to detect voids in tendon ducts, where a void indicates a possible location for tendon corrosion and rupture. The impact echo method is currently used in civil engineering to determine thicknesses or depths by measuring the resonance frequency of the S1 Lamb mode associated to its zero group velocity (ZGV) frequency. A downward shift of the ZGV frequency is commonly associated with the presence of an internal void, but evidence of such phenomena in case of fully filled ducts calls for deeper physical insight. In this paper we show impact-echo results obtained with a laser interferometer on a 0.25 m thick concrete test wall containing filled and partially or fully empty ducts, with both thin and thick duct walls. The data corroborate ZGV frequency shift to the modification of the local stiffness of the wall.

Original languageEnglish (US)
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Pages1365-1370
Number of pages6
DOIs
StatePublished - Nov 10 2011
Event37th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE - San Diego, CA, United States
Duration: Jul 18 2010Jul 23 2010

Publication series

NameAIP Conference Proceedings
Volume1335
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other37th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE
CountryUnited States
CitySan Diego, CA
Period7/18/107/23/10

Keywords

  • Concrete
  • Impact Echo
  • Nondestructive Evaluation
  • Resonance
  • Ultrasonic

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Abraham, O., Popovics, J. S., & Cottineau, L. M. (2011). Modification of the zero group velocity (impact echo) resonance frequency in the presence of voids for the inspection of tendon ducts. In Review of Progress in Quantitative Nondestructive Evaluation (pp. 1365-1370). (AIP Conference Proceedings; Vol. 1335). https://doi.org/10.1063/1.3592091