DETECTION OF FLAWS IN REINFORCING STEEL IN PRESTRESSED CONCRETE BRIDGE MEMBERS

The long-range objective of the research summarized in this report is the development of a practical nondestructive (NDE) method for detecting deterioration in the reinforcement of prestressed concrete bridge structural members in situ. A detailed definition of the problem is presented and the technical approach is summarized. The basis for selecting and assessing fifteen NDE methods is reviewed, and the results of a limited laboratory investigation of the magnetic method prior to developing inspection equipment are summarized. Development of preliminary magnetic insepction equipment are summarized. Development of a preliminary magnetic insepction equipment is described and many records are presented from laboratory evaluations using a 20-ft. (6m) section of Texas Type "C" beam and from field evaluations on the Sixth South Street Viaduct at Salt Lake City, Utah. Similarities between laboratory and field insepction signatures are indicated; other prominent anomalous signatures are shown which correlated with steel elements neither known to be present nor shown on the plans; still other field signatures are shown which indicated the stirrup configuration in the post-tension girders was not in accordance with the plans. Correlation investigations are described which illustrate promising electronic signature enhancement and recognition methods for discriminating between steel artifacts and deterioration. Recommendations for further development are outlined. (FHWA)

  • Corporate Authors:

    Southwest Research Institute

    6220 Culebra Road, P.O. Drawer 28510
    San Antonio, TX  United States  78228-0510

    Federal Highway Administration

    Office of Research, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Kusenberger, F N
    • Barton, J R
  • Publication Date: 1981-4

Media Info

  • Pagination: 197 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00341488
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-81- 87 Final Rpt., FCP 35F1-042
  • Contract Numbers: DOT-FH-11-8999
  • Files: TRIS, USDOT
  • Created Date: Dec 22 1981 12:00AM