United States Department of Transportation
i
Validation of the MEPDG transfer functions using the LTPP test sections in Georgia task 2 interim report.
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2013-07-16
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[PDF-4.76 MB]
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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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