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Proceedings Paper

One-to-one comparison between radar results and reality on a concrete bridge
Author(s): Johannes Hugenschmidt
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Paper Abstract

The inspection ofbridge decks is today a routine application of the GPR method. Pavement thickness, depth of re-bar, concrete damage and the position of tendons are some of the issues that are addressed with GPR. However, in most cases a verification of radar results is either not possible, restricted to laboratory specimens or to a few points on real objects. A detailed comparison between radar results and reality for bridge decks is not only of scientific interest but could also improve the acceptance of GPR in this field of work. In a research project, bridges designated for demolition are inspected with EMPA's mobile GPR unit. Radar results are reported before the bridge is taken down. After demolition radar results are verified through a comparison with actual bridge parts. Work on the first in a series of 6 bridges has been completed recently. The radar inspection was carried out along 2 lines over the whole length of the bridge. During demolition, the bridge was sawed along the lines where the radar inspection had been carried out and the parts were stored in a landfill. This enabled a one-to-one comparison between radar results and reality.

Paper Details

Date Published: 12 April 2002
PDF: 6 pages
Proc. SPIE 4758, Ninth International Conference on Ground Penetrating Radar, (12 April 2002); doi: 10.1117/12.462219
Show Author Affiliations
Johannes Hugenschmidt, Swiss Federal Labs. for Materials Testing and Research (Switzerland)

Published in SPIE Proceedings Vol. 4758:
Ninth International Conference on Ground Penetrating Radar
Steven Koppenjan; Hua Lee, Editor(s)

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