Quantitative evaluation of contactless impact echo for non-destructive assessment of void detection within tendon ducts

Franck Schoefs, Odile Abraham, John S. Popovics

Research output: Contribution to journalArticle

Abstract

Owners of pre-stressed concrete structures must realize preventive maintenance in order to maintain structural safety and limit economic losses. Detection voids in tendon ducts, where corrosion could occur, is key in this effort. This paper focuses on the quantification of the performance of the impact echo method (IEM), applied using a new laser interferometer contactless robot, for duct void detection in a reinforced concrete wall. We show first the influence of the wall stiffness on the IEM (resonance) frequency. We use a probabilistic modeling to evaluate the IEM. We illustrate a way for accounting on-site uncertainties of NDT measurements.

Original languageEnglish (US)
Pages (from-to)885-892
Number of pages8
JournalConstruction and Building Materials
Volume37
DOIs
StatePublished - Dec 2012

Keywords

  • Impact echo
  • Laser interferometer
  • POD PFA
  • ROC curve
  • Robot
  • Voids in tendon duct
  • α-δ Method

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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