Article (Scientific journals)
Static Detection of Thin Layers into Concrete with Ground Penetrating Radar
Van der Wielen, Audrey; Courard, Luc; Nguyen, Frédéric
2012In Restoration of Buildings and Monuments, 18 (3/4), p. 247-254
Peer reviewed
 

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Keywords :
GPR; radar; thin layer; NDT; concrete; reflection
Abstract :
[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 concrete bridge deck 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, most commercial GPR systems emit a large frequency band wavelet, which undergoes attenuation into the layer. To analyze 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 :
Static Detection of Thin Layers into Concrete with Ground Penetrating Radar
Publication date :
2012
Journal title :
Restoration of Buildings and Monuments
ISSN :
1864-7251
eISSN :
1864-7022
Publisher :
De Gruyter, Switzerland
Volume :
18
Issue :
3/4
Pages :
247-254
Peer reviewed :
Peer reviewed
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 20 August 2012

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