United States Department of Transportation
i
Nondestructive pavement evaluation using finite element analysis based soft computing models.
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2009-09-15
[PDF-2.25 MB]
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Abstract:Evaluating structural condition of existing, in-service pavements constitutes annually a major part of the
maintenance and rehabilitation activities undertaken by State Highway Agencies (SHAs). Accurate
estimation of pavement geometry and layer material properties through the use of proper
nondestructive testing and sensor technologies is very important for evaluating pavement’s structural
condition, its remaining life for maintenance and rehabilitation purposes, and for properly incorporating
life cycle cost considerations into an up to date, improved Pavement Management System. For this
purpose, pavement deflection basins gathered from the nondestructive Falling Weight Deflectometer
(FWD) test data are commonly used to evaluate pavement structural conditions. Development of an
innovative methodology, called SOFTSYS, Soft Computing Based Pavement and Geomaterial System
Analyzer, is proposed here as an original way of interpreting the results of FWD tests for full-depth and
conventional flexible pavements with the purpose of determining pavement layer properties as well as
the layer thicknesses from FWD data without the need for pavement coring. Since the layer thickness
information plays a crucial role in FWD data back calculation and remaining pavement life estimation,
the outstanding contribution of SOFTSYS will be in the reliable estimation of pavement layer thicknesses
in addition to their stiffness properties. Using only FWD test results (i.e. deflections) as inputs, SOFTSYS
will calculate all the necessary properties for pavement evaluation.
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