[en] Ground Penetrating Radar (GPR) is a nondestructive technique particularly well adapted to the inspection of concrete structures and can help to determine the structure inner geometry or to detect damaged areas. When the GPR is used on structures containing thin layers, for example the sealing layer of a bridge or the void into a masonry wall, it is important for the radar user to know the minimum thickness required to detect and estimate the thickness of those layers.
The theory of thin layer detection is based on a sine wave but, in reality, the GPR emits a complicated pulse, which undergoes attenuation into the layer. To see the influence of those realistic conditions on the reflection coefficient of a thin layer, we combined experimental measurements and numerical FDTD simulations. The experimental results matched the numerical predictions well, presenting a fast attenuation compared to the theoretical predictions. Nevertheless, for thicknesses inferior to λ/11, the reflection coefficient could still be considered as linearly dependent of the thickness to wavelength ratio.
Disciplines :
Civil engineering
Author, co-author :
Van der Wielen, Audrey ; Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Matériaux de construction non métalliques du génie civil
Courard, Luc ; Université de Liège - ULiège > Département Argenco : Secteur GeMMe > Matériaux de construction non métalliques du génie civil
Nguyen, Frédéric ; Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Language :
English
Title :
Detection of Defects in Concrete With Ground Penetrating Radar
Publication date :
September 2011
Event name :
ESPSC 2011 European Symposium on Polymers in Sustainable Construction
Event organizer :
Deparrtment of Building Materials Engineering, Warsaw University of Technology Building Research Institute, Warsaw
Event place :
Warsaw, Poland
Event date :
du 6 au 7 septembre 2011
Audience :
International
Main work title :
ESPSC 2011: European Symposium on Polymers in Sustainable Construction (Czarnecki Symposium)
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