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Validation of the MEPDG transfer functions using the LTPP test sections in Georgia task 2 interim report.
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  • Alternative Title:
    Verification and local calibration/validation of the MEPDG performance models for use in Georgia.
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  • Edition:
    Task 2 Interim Report
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  • Abstract:
    The Georgia Department of Transportation (GDOT) is transitioning from empirical design procedures to the MEPDG

    procedure for designing new and rehabilitated highway pavements. GDOT currently uses the 1972 AASHTO Interim

    Guide for Design of Pavement Structures as the standard pavement design procedure. As a part of the implementation

    process, GDOT has undertaken a project to verify the MEPDG global distress models and locally calibrate these

    models for local field conditions of Georgia, if determined to be necessary by the verification process, using the LongTerm

    Pavement Performance (LTPP) and non-LTPP sections in Georgia.

    One objective of this project is to verify or confirm that the MEPDG transfer functions and global calibration factors

    derived from NCHRP project 1-40D reasonably predict distresses and smoothness for the LTPP sites located in

    Georgia using proper design inputs. This report includes a comparison of the predicted and measured distress and

    International Roughness Index (IRI) values measured over time and between different projects, pavement design

    features, and/or site condition features. The confirmation process follows the procedure presented in the AASHTO

    MEPDG Local Calibration Guide (AASHTO, 2010). Specifically, this report documents use of the LTPP sites in

    Georgia to determine the bias and accuracy of the MEPDG transfer functions in predicting the distress and

    performance of those LTPP test sections.

    In summary, the number of Georgia LTPP sites and levels of distress exhibited on the test sections are considered

    inadequate for the validation or confirmation process of the global calibration coefficients from a statistical perspective.

    More importantly, bias between the measured and predicted distress for some of the transfer functions of both flexible

    and rigid pavements were found. Thus, it is recommended that GDOT proceed with the next phase of the study and

    select projects to fill in the many key gaps so that the calibration process can be used to adjust the calibration

    coefficients for each distress.

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