Advanced Methods for Using FWD Deflection-Time Data to Predict Pavement Performance: LTTP Tech Brief
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Advanced Methods for Using FWD Deflection-Time Data to Predict Pavement Performance: LTTP Tech Brief

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English
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  • Corporate Creators:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA-RD-97-093
  • Resource Type:
    Brief
  • Geographical Coverage:
    United States
  • TRIS Online Accession Number:
    00823201
  • Corporate Publisher:
    Turner-Fairbank Highway Research Center
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
  • Abstract:
    An important property of materials that defines the viscoelastic and inelastic characteristics of materials is the dissipated work or dissipated energy of the material. Dissipated energy has been used in the asphalt concrete fatigue area for many years by some agencies. The falling-weight deflectometer (FWD) load deflection-time data can be used to measure the dissipated work during the loading and unloading of the pavement structure from the FWD impact load. This dissipated work should be related to the occurrence of selected surface distresses, especially for asphalt concrete-surfaced pavements. The deflection-time history data collected within the Long-Term Pavement Performance (LTPP) program represent an invaluable data source and critical data element that has yet to be thoroughly investigated and used to its full potential in pavement diagnostic studies. A limited study was undertaken to determine if there is any relationship between the dissipated work as measured with the FWD and levels of pavement distress. The study also shows some of the different parameters that can be used from the deflection-time data and the benefit of using these data for pavement diagnostic studies and pavement classifications.
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