United States Department of Transportation
i
Pilot study : rolling wheel deflectometer, falling weight deflectometer, and ground penetrating radar on New Hampshire roadways.
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2011-02-01
[PDF-4.25 MB]
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Abstract:The New Hampshire Department of Transportation Pavement Management Section’s scope of work includes monitoring, evaluating, and
sometimes forecasting the condition of New Hampshire’s 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 Management’s 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.
The RWD test routes totaled 650 lane miles. Average deflections ranged from 6.4 to 19.2 mils and representative deflections ranged from 9.2
to 22.4 mils. Falling weight deflectometer (FWD) deflections were similar RWD deflections with the best average and representative
deflection correlations occurring at an FWD load plate pressure of 110 psi. RWD advantages over FWD include continuous pavement
deflection profiles, no significant disruption of traffic, and $5,700 savings per lane mile.
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