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Falling Weight Deflectometer (FWD) Testing and Analysis Guidelines Volume I (U.S. Customary Units Version)
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2007-02-01
[PDF-1.04 MB]
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Edition:Final Report
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Abstract:This report contains guidelines for the collection and analysis of FWD data. Background information is provided on the various types of FWD equipment and important components. Information on the various types of FWD analysis procedures is also provided, including: AASHTO 1993 Guide for the Design of Pavement Structures AC and PCC analysis procedures, layered-elastic backcalculation, non-linear backcalculation, load transfer efficiency, void detection, depth to hard bottom estimation and temperature correction techniques. This report includes a field data collection procedure, with requirements for equipment capabilities, deflection sensor spacing, drop sequences and test point spacings. An optional procedure is provided for the collection of sub-surface temperature measurements. Recommendations are given for the use of field data QC checks. Guidelines are also included for the collection of layer thickness data. This report includes an FWD data analysis procedure, using the MODTAG program. This procedure includes data QA checks, sub-sectioning and layered-elastic backcalculation. Analysis using the AASHTO 1993 Guide for the Design of Pavement Structures methods is discussed as an alternate procedure. Guidelines are provided for reporting analysis results.
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