Kontroll av befintliga förhållanden inför projektering, med georadar

Nordic countries have been pioneers in ground penetrating radar (GPR) applications on roads. The first applications have been reported already in early 1980´s from Denmark and Sweden. In Finland subgrade soil and road structures have been analyzed with GPR already for almost thirty years and the method is a routine tool in Finnish Traffic Agency’s rehabilitation projects. This GPR method description guideline for road rehabilitation projects has been made due to new procurement policies in Nordic road administrations which means that road condition surveys will be ordered through open competition. That is why it is essential that current practice is described precisely to make it also possible for new entrepreneurs to know how and at which level the ground penetrating radar surveys should be done and what is the default quality level for the results. There is also a need to specify separately the procedure that should be followed in surveys projects made in 2 dimensional (2D) and 3 dimensional (3D) GPR projects. This method description guideline should be used when doing data collection with the 2D and 3D GPR systems prior to rehabilitation planning. It should also be used when modifying output data of the interpretation and problem diagnostics on a compatible format that can be read with GPR data viewer software packages. A description of the testing arrangements and antennas accreditation is given as well. In this publication, there is also an exact description of how ground penetrating radar data collection should be done, how the collected data should be processed and interpreted and how the outcome should be linked to road registry data bases or other GIS systems used in Nordic Road Administrations. Pertaining to the parts and methods not described in this publication, the other national publications and guidelines related to road rehabilitation projects must be followed.