Rutgers/NJDOT Pavement Resource Program (NJDOT Statewide GPR Project Network GPR Data Collection and Analysis Update of HPMA GPR Database)

The Center for Advanced Transportation Infrastructure (CAIT) of Rutgers University is mandated to conduct Ground Penetrating Radar (GPR) surveys to update the New Jersey Department of Transportation's (NJDOT’s) pavement management system (PMS) with GPR measured pavement layer thicknesses. Based on the reviewof the GPR data currently in the pavement management system, it has been identified that 2328 miles of pavement have “No GPR Data” and 1550 miles of pavement have data with“Gaps”. Gaps generally refer to missing portions of data of about 50 to 100 ft in length. The number and distribution of Gaps vary. In some cases, the sections with Gaps contain adequate GPR information to interpolate thicknesses between the Gaps. For the purpose of this work plan, the section with “No GPR Data” are considered to be of the highest priority. As a part of the PMS project, GPR surveys were conducted at locations throughout New Jersey. Interpretations of the survey information were conducted for network-level pavement management purposes. The objective of the work was to provide NJDOT with information obtained by the GPR survey regarding pavement structure and layer properties (thickness, dielectric, etc.) to aid at decision-making, improvement of falling weight deflectometer (FWD) backcalculation or characterization of pavement thickness variability over potential project sections.