Validation of the MEPDG transfer functions using the LTPP test sections in Georgia task 2 interim report.

Details

• Alternative Title:
  Verification and local calibration/validation of the MEPDG performance models for use in Georgia.
• Creators:
  Von Quintus, Harold L. ; Mallela, Jagannath ; Sadasivam, Suri ; Darter, Michael I.
• Corporate Creators:
  Applied Research Associates, Inc.
• Corporate Contributors:
  Georgia Department of Transportation
• Subject/TRT Terms:
  • Calibration
  • Pavement distress
  • Test sections
  • Transfer functions
  • Validation
  • Mechanistic-Empirical Pavement Design Guide
  • ME design
  • transfer functions
  • fatigue cracking
  • rutting
  More +
• Publication/ Report Number:
  FHWA/GA-014-11-17
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Georgia
• Edition:
  Task 2 Interim Report
• Contracting Officer:
  Pahno, Steve
• Corporate Publisher:
  Georgia. Dept. of Transportation
• 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.
  More +
• Format:
  PDF
• Funding:
  TOOMRPRO130020
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31110/dot_31110_DS1.pdf
• File Type:
  [PDF - 4.76 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:88492c681e642bfff9a206956da99a0429e82c1d88497f56ee8eb4c240cc9ba0