Falling weight deflectometer calibration: looking back to the future

As part of the Strategic Highway Research Program (SHRP), regional falling weight deflectometer (FWD) calibration centers were established at locations in the United States in the early 1990s. After ten years of FWD calibrations, there is enough evidence to look back at FWD calibrations and review the SHRP FWD calibration protocols to determine possible changes and improvements. An analysis of FWD calibrations performed through 2000 at five FWD calibration centers in the United States determined some changes to FWD calibrations might be warranted. However, it is critical to balance the cost of implementation of new protocols versus the improvements these changes may provide to the quality of data collected with a FWD. The analysis also shows the need for annual calibrations to ensure FWDs meet existing standards for use. Based upon the results of the analysis and input from FWD users and operators from the US and Europe, proposed changes to the SHRP protocol were collected for review. This paper reviews the suggested changes and makes recommendations for more detailed analysis and priority for inclusion in revised calibration protocols.


  • English

Media Info

  • Pagination: 23p
  • Monograph Title: Comparison of non-destructive testing devices to determine in situ properties of asphalt concrete pavement layers

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Filing Info

  • Accession Number: 01443208
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, ATRI
  • Created Date: Aug 25 2012 1:10AM