Pilot Study - Rolling Wheel Deflectometer, Falling Weight Deflectometer, and Ground Penetrating Radar on New Hampshire Roadways. Final Report

摘要

The New Hampshire Department of Transportation Pavement Management Sections scope of work includes monitoring, evaluating, and sometimes forecasting the condition of New Hampshires 4,560 miles of roadway network in order to provide guidance on rehabilitation or preservation treatments. Pavement Management monitors rutting, cracking, ride quality, and several other road and pavement parameters using a 2009 PathRunner XP Model LG-23 road and pavement condition data collection vehicle. Supplemental methods to evaluate pavement structural capacity would enhance Pavement Managements ability to forecast pavement performance. This project evaluated non-destructive testing methods to evaluate pavement thickness and deflection information by means of ground penetrating radar (GPR) and rolling wheel deflectometer (RWD) testing respectively. The GPR testing covered 115 miles and resulted with substantial variations in pavement thicknesses ranging from 4.0 to 12.0 inches. These predictions, when correlated with data from 35 ground cores, show an average accuracy of 6.5%. Although an initial purchase of a GPR system is costly, once in place, this testing is expected to cost $140 per lane mile compared to the cost of pavement core sampling at $10,000 per lane mile.