Implementation and Calibration of the MEPDG in Georgia

The Georgia Department of Transportation (GDOT) currently uses the empirical 1972 American Association of State Highway and Transportation Officials (AASHTO) Interim Guide for Design of Pavement Structures as their standard pavement design procedure. However, GDOT plans to transition to the Mechanistic Empirical Pavement Design Guide (MEPDG) for designing new and rehabilitated pavements. As a part of the transition process, GDOT has sponsored an implementation project. One objective of the implementation project was to calibrate the MEPDG global distress transfer functions to local conditions. The Georgia Long-Term Pavement Performance (LTPP) and non-LTPP roadway segments were used for the verification-calibration-validation process. One of the first activities of the implementation project was to verify or confirm that the MEPDG transfer functions and global calibration coefficients derived from National Cooperative Highway Research Program (NCHRP) project 1-40D reasonably predict distresses and smoothness in Georgia. The Task Order 1, Task 2 interim report focused on using the Georgia LTPP test sections to confirm the applicability of the global calibration coefficients. The interim report concluded some of the transfer functions exhibited significant bias between the measured and predicted distress and require local calibration. The Task Order 2, Task 5 Interim Report documented the local calibration of the transfer functions using LTPP and non-LTPP roadway segments. The calibration process followed the procedure presented in the 2010 AASHTO MEPDG Local Calibration Guide. GDOT calibration coefficients were derived to remove bias for the rutting, fatigue cracking, and thermal cracking transfer functions of flexible pavements, and the faulting and fatigue cracking transfer functions of rigid pavements. The global coefficients of the smoothness degradation regression equation for flexible and rigid pavements were also checked and calibrated as needed for their applicability to Georgia conditions. This report summarizes all calibration-validation activities completed within this implementation project.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Task 7 Final Report – Task Order #3
  • Features: Appendices; Figures; Maps; Photos; References; Tables;
  • Pagination: 237p

Subject/Index Terms

Filing Info

  • Accession Number: 01599286
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/GA‐014‐11‐17
  • Contract Numbers: TOOMRPRO130020
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: May 2 2016 1:45PM