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Non-destructive investigation using ground penetrating radar is becomingmore popular in the inspection of civil structures. Currently, traditional 2Dimaging is used as a preliminary tool to fi nd possible areas of interest formore detailed inspection, which can be accomplished by more advancedtechniques like 3D image reconstruction or tomography. In this paper,a general overview of the work done at University of Minho regarding thesetechniques is presented, together with their limitations and advantages overtypical radargrams, with implications for civil engineering applications. Forthis purpose, data acquisition on two large masonry walls and one largeconcrete specimen have been carried out, using refl ection mode, 3Dreconstruction and transmission tomography. The specimens have beenspecially built for non-destructive inspection techniques testing, incorporatingdifferent materials and internal voids. Radar tomography and 3D imagereconstruction techniques provided much more detailed information aboutstructural integrity and shapes and location of the voids, when compared to2D imaging originally used for potential target identification.Fundação para a Ciência e a Tecnologia (FCT) - POCTI SFRH/BD/6409/2001"Sustainable Bridges" European project - FP6-PLT-0165

Practical implications of GPR investigation using 3D data reconstruction and transmission tomography