Infrasense has performed pavement structure evaluations for the Minnesota Department of Transportation (MnDOT). Since 2015, ground penetrating radar (GPR) surveys totaling over 480 lane-miles were performed on roads in both the Metro and Northeast regions. For each project, preliminary GPR results were used to select cores to be used for calibration and confirmation of the GPR data, and GPR asphalt results were typically within 10% of the measured core thickness.
The pavement structure evaluations performed in the Metro region provide MnDOT with important decision-making information in their pavement design process. Additionally, the results of the GPR evaluations are used in construction planning to identify appropriate pavements for traffic staging during construction.
All GPR data was collected at high-speed without interruption to normal traffic flow. A TMA truck shadowed the GPR vehicle for surveys of the shoulder lanes, due to the need to drive at a reduced speed in these areas.