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Assessment of structural capacity indicators from rolling wheel deflectometer data collection in Louisiana : research project capsule.
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2016-06-01
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Abstract:The use of the rolling wheel deflectometer (RWD), which measures
deflections at highway speeds, offers the potential to characterize the
structural capacity of the road network without major delays and in a cost-effective way. In 2009, the Louisiana Department of Transportation and
Development (DOTD) conducted a comprehensive testing program of the
RWD in District 05. Measurements were used to assess the repeatability
of RWD measurements, the effect of truck speeds, and the relationship
between RWD and the falling weight deflectometer (FWD) deflection
measurements and pavement conditions. Based on the results of the
experimental program, the following structural capacity indicators were
developed: the RWD Index (RI), defined in terms of the average RWD
deflection and the standard deviation of the measurements based on
a 1.5 mile segment; the pavement Structural Number (SN) in terms of
the average RWD deflection and RI based on a 1.5-mile segment; use of
multivariate statistical methods and fuzzy logic in combination with the
RI index; and the Zone RWD Index (ZRI) in terms of the average RWD
deflection variance based on a 0.1-mile segment.
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