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Falling Weight Deflectometer Usage (2008) / Chapter Skim
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Pages 20-22

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From page 20...
... According to a survey conducted for this synthesis, 55% of SHAs use a relative calibration procedure developed by Strategic Highway Research Program (SHRP)
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From page 21...
... . Additionally, Section 7 of ASTM D4694-96 recommends that deflection sensors be calibrated "at least once a month or in accordance with the manufacturer's recommendations" ("Standard Test Method for Deflections .
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From page 22...
... At the Texas calibration center, the TxDOT method can also be used. On average, the Texas and Pennsylvania DOT calibration centers see about 30 FWDs per year, the Colorado calibration center sees about 20, and the Minnesota calibration center sees about 8.
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Key Terms

  • highway research
  • load plate
  • design life
  • deflection sensor
  • falling weight

  • pennsylvania dot
  • texas dot


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