Magnetic field techniques for the inspection of steel under concrete cover

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DOIResolve DOI: http://doi.org/10.1016/S0963-8695(00)00051-7
AuthorSearch for: ; Search for:
TypeArticle
Journal titleNDT&E International
Volume34
IssueOct 7
Pages445456; # of pages: 12
AbstractThe results of a study comparing residual magnetic field measurements to magnetic flux leakage measurements as methods to detect broken prestressing steel are presented. Analysis of two and three dimensional magnetic field plots shows that the residual magnetic field technique has strong potential in this application, with detectable signals from a single broken wire on a seven strand cable being found up to 70 mm from the cable surface. Magnetic flux leakage measurements with the same yoke produced detectable signals only when the cable was completely severed, indicating that the yoke was not driving the cable into saturation during the magnetisation process. However, the residual field technique was also found to be very sensitive to the technique used to magnetise the object being inspected, indicating that considerable care would be necessary to use the technique successfully in the field.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number43699
9764
NPARC number20331368
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Record identifier31334c66-3c0d-4ee0-9bb9-87f0870b415a
Record created2012-07-18
Record modified2016-05-09
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