Reliability and accuracy of radar results on concrete bridges (AGB2000/553)
Overview
Background & policy context:
Swiss federal laboratories for material science and technology already examined numerous bridges with the mobile geo-radar system. It mostly focused on the detection of the lining thickness and the depth of the top reinforcing layer in the foreground. Most of these studies could be clearly seen as a success, but the success of control was limited to a comparison between results and individual radar soundings.
Should be carried out and evaluated a radar investigation from demolition along the intended cut lines, this would offer a rare opportunity for a one to one comparison between radar results and reality.
Objectives:
Evaluation of the accuracy and benefits of radar results (ground penetrating radar) by a one-to-one comparison with reality.
Methodology:
Field tests on total of 6 bridges.
Bridges designated for demolition were inspected with ground penetrating radar and the results were laid open. During and after demolition radar results are verified through a comparison with actual bridge parts.
In a laboratory experiment the interior of a bridge girder was mapped in three dimensions
and in great detail.
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