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Proceedings Paper

Tests and assessments of NDT methods for concrete bridges
Author(s): Juergen Krieger; M. Krause; Herbert Wiggenhauser
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Paper Abstract

A research project is described involving a comparison of different non-destructive test methods for concrete bridges. A cooperative test series was started with the aim to compare and evaluate the performance and benefits of the latest technical developments in this field. For this purpose test specimens with localized defects were produced. Different modifications of radar, ultrasonic-echo and impact-echo methods were investigated. Including two- and three- dimensional reconstruction models. The experiments were accompanied by numerical simulation of the propagation of sound waves and microwaves. The results showed that the radar and the ultrasonic methods were efficient tools to locate the tendon ducts accurately if the reinforcing bars were not to narrowly spaced. The ultrasonic imaging methods were capable of identifying injection and compaction faults in a blind test. The good performance of the impact-echo method with regard to locating tendon ducts which was claimed in several publications could not be validated in the present investigations. The simulation models provided valuable information on how to improve the experimental test program and its evaluation.

Paper Details

Date Published: 31 March 1998
PDF: 12 pages
Proc. SPIE 3400, Structural Materials Technology III: An NDT Conference, (31 March 1998); doi: 10.1117/12.300098
Show Author Affiliations
Juergen Krieger, Federal Highway Research Institute (Germany)
M. Krause, Federal Institute for Materials Research and Testing (Germany)
Herbert Wiggenhauser, Federal Institute for Materials Research and Testing (Germany)


Published in SPIE Proceedings Vol. 3400:
Structural Materials Technology III: An NDT Conference
Ronald D. Medlock; David C. Laffrey, Editor(s)

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