مطالعات آزمايشگاهي كاربرد GPR در رديابي خرابي هاي اجرائي محل تماس دو لايه در يك روسازي مركب

Laboratory Studies for Detecting the Constructional Interface Defaults in a Composite Pavement by GPR

For the possibility of GPR utilization (as a non-destructive and new method for pavement and bridge deck quality control), experimental approaches are used to characterize the interface between two layers of lean concrete and bituminous. Between these two layers, an intermediate layer with different thicknesses and natures is supposed to determine an intact interface from damage one. Therefore, the influence of different kind of damage on the electromagnetic waves reflected from the interfaces is estimated. The results of studies show that the thickness and the media nature of the interface have an important influence on the amplitude and on the time of the signals that reflected from the interface. These studies also illustrate that by the radar, an in tact interface from a damage one can be differentiated, provided that, there is no small deformation and bearing failure of layers. Moreover, for a damage interface, the interface nature can be recognized with signal analysis.