United States Department of Transportation
i
Interpreting Falling Weight Deflectometer (FWD) Data (for Asphalt and Concrete Pavements)
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2018-04-16
[PDF-756.29 KB]
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Edition:Final Report 4/17/2015 – 4/16/2018
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Abstract:Falling weight deflectometer (FWD) testing is a valuable method for assessing the structural condition of existing pavement structures. For jointed plain concrete pavements (JPCPs), FWD testing is used to detect voids, monitor joints and crack performance, and backcalculate the modulus of elasticity of the existing Portland cement concrete (PCC) and the k-value of all supporting layers. For asphalt concrete (AC) pavements, FWD testing is used to backcalculate the stiffness of each layer and to estimate the amount of damage in the existing asphalt. This report summarizes the testing protocols and data analysis procedures recommended. The report consists of three primary sections. The first section describes the testing protocols recommended for FWD data collection. The second section defines the changes proposed to current PennDOT documents (including Publication 242, Publication 408, and the PennDOT Pavement ME Design Preliminary User Input Guide) based on the findings of this study. The third section is an appendix that is divided into four separate appendices: A-Scheduling and performing FWD testing; B-Data analysis guidelines; C-Research findings and D-Laboratory and field testing.
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