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SQUID System for Magnetic Inspection of Prestressed Tendons on Concrete Bridges

H.-J. Krause, W. Wolf, W. Glaas, E. Zimmermann, M.I. Faley
Forschungszentrum Jülich, D-52425 Jülich, Germany
G. Sawade
Forschungs- und Materialprüfanstalt Baden-Württemberg, D-70569 Stuttgart, Germany
G. Neudert , U. Gampe
Siempelkamp Prüf- und Gutachtergesellschaft mbH, D-01099 Dresden, Germany
J. Krieger
Bundesanstalt für StraBenwesen, D-51427 Bergisch-Gladbach, Germany
Contact

Abstract

1. Introduction

2. Magnetic stray field technique

3. Signal analysis

.

4. SQUID magnetometer sensor

5. Setup of the system

6. Measurements on a German highway bridge

6. Conclusions and outlook

Acknowledgement

References

  1. F. Kusenberger, N. Barton, Detection of flaws in reinforcement steels in prestressed concrete bridges, Final Report FH-WA/RD-81/087, Federal Highway Administration, Washington, DC (1981).
  2. B. Hillemeyer, C. Flohrer, Zerstörungsfreie Ortung von Spannstahlbrüchen in Spannbeton-Deckenträgern, DGZfP, Berlin (1991).
  3. G. Sawade et al., Signal analysis methods for remote magnetic examination of prestressed elements, Proc. Intl. Sympos. on NDT in Civil Engineering (NDT-CE), Vol.II, DGZfP, Berlin, pp.1077-1084 (1995).
  4. H. Scheel, Spannstahlbruchortung an Spannbetonbauteilen mit nachträglichem Verbund unter Ausnutzung des Remanenzmagnetismus, Ph.D. Thesis, D 83, Technical University Berlin, Berlin (1997).
  5. G. Sawade, U. Gampe, H.-J. Krause, Non Destructive Examination of Prestressed Tendons by the Magnetic Stray Field Method, in: Proc. 4th Conf. on Engineering Structural Integrity Assessment, Cambridge, U.K., pp. 353-363 (1998).
  6. A. Ghorbanpoor, Magnetic-based NDE of steel in prestressed and post-tensioned concrete bridges, Proc. Structural Materials Technology III, San Antonio, Texas, pp. 343-349 (1998).
  7. J. Krieger, H.-J. Krause, U. Gampe, G. Sawade, Magnetic field measurements on bridges and develop-ment of a mobile SQUID system, Proc. Intl. Conf. on NDE Techniques for Aging Infrastructure & Manufacturing, Newport Beach, California, USA, pp. 229-239 (1999).
  8. M.I. Faley et al., Operation of the HTS dc-SQUID Sensors in High Magnetic Fields, IEEE Trans. Appl. Supercond. 9, 3386-3391 (1999).
  9. E. Zimmermann et al., HTS-SQUID Magnetometer with Digital Feedback Control for NDE Applications, in: Rev. Prog. QNDE, Vol. 16B, Eds.: D.O. Thompson, D.E. Chimenti, Plenum, NY, pp. 2129-35 (1997).
  10. J. Krieger, E. Rath, H.-J. Krause, Anwendung zerstörungsfreier Prüfverfahren bei Betonbrücken: Messungen an der Talbrücke Michelsrombach, Berichte der BASt, Bergisch Gladbach, in press (2000).

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