NDT for Pavement Exploration using GPR

Assessment of pavement is an salient task as it plays a pivotal contribution to economic development and growth which bring social benefit. Due to modernization and increased traffic, in addition to maintenance the expansion of network and widening of existing road has become primarily important. It is foremost to have a non-destructive testing (NDT) to restrict the use of core sampling. Ground Penetrating Radar (GPR) has wide application in subsurface exploration which can be operated rapidly and without traffic interruption. This paper presents the evaluation of different layers and thickness of pavement using GPR having air horn antenna of center frequency 2 GHz and its comparison with 400 MHz antenna. The data obtained does not provide direct information which is to be processed and analyzed further. Test was conducted with different materials used in pavement and with different combinations so as to be familiar with patterns which different material give under varying dielectric constant.