Review of NDT methods on a weak post-tensioned beam before autopsy

X. Derobert; Odile Abraham; Ch. Aubagnac

doi:10.1117/12.462220

12 April 2002 Review of NDT methods on a weak post-tensioned beam before autopsy

X. Derobert, Odile Abraham, Ch. Aubagnac

Proceedings Volume 4758, Ninth International Conference on Ground Penetrating Radar; (2002) https://doi.org/10.1117/12.462220
Event: Ninth International Conference on Ground Penetrating Radar (GPR2002), 2002, Santa Barbara, CA, United States

Abstract

After the complete demolition of a prestressed concrete bridge in the south of France, a suspected weak posttensioned beam has been put aside for non-destructive testing (NDT). Ground Penetrating Radar (GPR), Ferroscan® (covermeter), gamma-ray radiography and impact-echo (IE) have been tested and their results are discussed after the autopsy of the beam by hydrodemolition. The paper describes how NDT surveys can answer structural engineers need, using complementary NDT approaches. The use of a second technique should provide a better level of answer, while eliminating certain ambiguities either by improving measurement reliability, or by focusing onto doubtful zones for more precise local measurements. Finally, problems not answered by these techniques, described herein are pin pointed.

Citation Download Citation

X. Derobert, Odile Abraham, and Ch. Aubagnac "Review of NDT methods on a weak post-tensioned beam before autopsy", Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); https://doi.org/10.1117/12.462220

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