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Falling Weight Deflectometer Usage (2008) / Chapter Skim
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Pages 23-28

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From page 23...
... For all pavement rehabilitation projects, the Idaho Transportation Department considers FWD data or R-values. Either may prove that a candidate design has a design life of This chapter covers FWD operations including data collection, management, and storage.
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From page 24...
... FWD data are used to calculate SNeff for flexible pavements and to calculate effective slab depth Deff for rigid pavements. Data are collected at the following increments: [H]
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From page 25...
... AC shoulders are tested at locations no more than 76 m (250 ft) apart "to help determine if the shoulders are structurally sufficient to carry travel lane traffic during construction." On rigid pavements, FWD tests are done to "determine overall stiffness, material properties, load transfer at the joints, and for void detection." On continuously reinforced concrete pavement (CRCP)
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From page 26...
... Worker safety With the goal of protecting workers and the safety of the motoring public, SHAs institute restrictions on FWD testing depending on environmental conditions. The survey results noting when FWD testing is prohibited are presented in Figure 6 for flexible pavement testing and in Figure 7 for rigid pavement testing.
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From page 27...
... Details for the accidents are summarized in Figure 8. FiguRe 8 survey responses to question 80: "Please describe the type(s)
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From page 28...
... . daTa ManaGeMenT Falling Weight deflectometer Field data File Types Although AASHTO recommends the PDDX data format for FWD output files, the survey revealed 12 distinct file formats in use.
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Key Terms

  • testing protocol
  • flexible pavement
  • rigid pavement
  • fwd program
  • pavement testing

  • fwd tests
  • load plate
  • california dot
  • design life
  • state highway

  • rehabilitation projects
  • falling weight
  • fwd data
  • survey response
  • mexico dot


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