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Improving the accuracy and usability of Iowa falling weight deflectometer data.
  • Published Date:
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Filetype[PDF-2.85 MB]

  • Publication/ Report Number:
    InTrans Project 11-415
  • Resource Type:
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  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
  • Format:
  • Abstract:
    This study aims to improve the accuracy and usability of Iowa Falling Weight Deflectometer (FWD) data by incorporating significant

    enhancements into the fully-automated software system for rapid processing of the FWD data. These enhancements include: (1) refined

    prediction of backcalculated pavement layer modulus through deflection basin matching/optimization, (2) temperature correction of

    backcalculated Hot-Mix Asphalt (HMA) layer modulus, (3) computation of 1993 AASHTO design guide related effective SN (SNeff)

    and effective k-value (keff ), (4) computation of Iowa DOT asphalt concrete (AC) overlay design related Structural Rating (SR) and kvalue

    (k), and (5) enhancement of user-friendliness of input and output from the software tool. A high-quality, easy-to-use

    backcalculation software package, referred to as, I-BACK: the Iowa Pavement Backcalculation Software, was developed to achieve the

    project goals and requirements. This report presents theoretical background behind the incorporated enhancements as well as guidance

    on the use of I-BACK developed in this study. The developed tool, I-BACK, provides more fine-tuned ANN pavement backcalculation

    results by implementation of deflection basin matching optimizer for conventional flexible, full-depth, rigid, and composite pavements.

    Implementation of this tool within Iowa DOT will facilitate accurate pavement structural evaluation and rehabilitation designs for

    pavement/asset management purposes. This research has also set the framework for the development of a simplified FWD deflection

    based HMA overlay design procedure which is one of the recommended areas for future research.

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