%0 Conference Paper
%A Krause, Hans-Joachim
%A Friese, Martin
%A Kathage, Andreas F.
%A Sawade, Gottfried
%A Willmes, Michael
%T Nondestructive Evaluation of Moisture and Salinity in Bridge and Parking Decks by the Radar-Magnetic Technique
%C Weimar
%I MFPA
%M FZJ-2013-06537
%P 397-406
%D 2013
%< Proceedings of the 10th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances
%X The radar-magnetic technique is based on a combination of static magnetic depth determination with the measurement of the propagation time of an electromagnetic radar wave. The rebar in the bridge or parking deck under test are used as reflectors for the two-way reflection time measurement with ground-penetrating radar. The depth of the reflector steel is determined by a measurement of two components of its static magnetic field. This magnetic depth determination is independent of the dielectric properties of the covering materials. Comparison of the radar delay and the magnetically extracted depth yields the averaged dielectric permittivity of the concrete and asphalt cover which can be used to determine its moisture. Provided that the moisture content is high enough, the salinity can be estimated from the reflected radar amplitude using phenomenological calibration curves.
%B 10th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances
%C 25 Sep 2013 - 27 Sep 2013, Weimar (Germany)
Y2 25 Sep 2013 - 27 Sep 2013
M2 Weimar, Germany
%F PUB:(DE-HGF)8 ; PUB:(DE-HGF)7
%9 Contribution to a conference proceedingsContribution to a book
%U https://juser.fz-juelich.de/record/141353