Falling Weight Deflectometer Usage (2008) / Chapter Skim
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Pages 37-42
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At the project level, VDOT derives PCC elastic moduli, composite modulus of subgrade reaction (k-value) , LTE, and presence of voids from FWD rigid pavement testing.
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conducted FWD tests on all roads where spring load restrictions had been practiced. In all cases, recommendations were made for AC overlays on the existing AC pavements based on the FWD data (Bush and Tohme 2003)
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Direct strength measurements, interpreted from FWD data, are combined with long-range weather forecasts and temperature probes. SDDOT adopted using FWD data for spring load restrictions in 1996.
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As an example, FWD tests on Virginia State Highway 288 showed where a cement-treated base needed to be placed during construction. A second example, where CRCP was placed, showed deflections greater than 0.14 mm (5.5 mils)
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pavement sections. In cases in which pavement testing had been performed by LTPP, the LTPP database was "found to be the best database available to deduce general patterns of the pavement behavior during field testing." The researchers reached 16 conclusions.
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The following are some of the findings (Beuving 2000) : • Spain -- At the project level, FWDs were used exclusively on rigid pavements; flexible pavements were tested using either Lacroix deflection measurement devices or FWDs.
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