Reference : Static Detection of Thin Layers into Concrete with Ground Penetrating

	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Civil engineering
	To cite this reference:	http://hdl.handle.net/2268/129266

Title :	Static Detection of Thin Layers into Concrete with Ground Penetrating
Language :	English
Author, co-author :	Van der Wielen, Audrey [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Matériaux de construction non métalliques du génie civil >]
	Courard, Luc [Université de Liège - ULg > Département Argenco : Secteur GeMMe > Matériaux de construction non métalliques du génie civil >]
	Nguyen, Frédéric [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
Publication date :	2012
Journal title :	Restoration of Buildings and Monuments = Bauinstandsetzen und Baudenkmalpflege
Volume :	18
Issue/season :	3/4
Pages :	247-254
Audience :	International
ISSN :	1864-7251
e-ISSN :	1864-7022
Keywords :	[en] 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.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/129266

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