Implementation of the MEPDG for Flexible Pavements in Idaho
The development of the new Mechanistic Empirical Pavement Design Guide (MEPDG), considers mechanistic-empirical design principles to design new and rehabilitated pavements, and accounts for many factors that affect the design, including material variability and traffic loads. It also incorporates a very sophisticated climatic model that accounts for the expected variation of the material properties due to climatic changes. The design criteria in the guide are based on distress models that have been calibrated based on field data from previous road tests such as the AASHO Road, the MnRoad, and data collected nationwide from the Long-Term Pavement Performance (LTPP) program sites. Unfortunately, even though the LTPP data is considered the most comprehensive in-service data, it is very limited when performance models are to be calibrated for a specific location. Hence, to implement the new guide, an agency needs to identify and establish procedures for how to obtain required data and establish a policy on the acceptance level of the design criteria.
The State of Idaho Transporton Department (ITD) needs to develop and execute an implementation plan for the MEPDG in Idaho. The research team will work cooperatively with the materials and planning sections at ITD to develop the required data from all state regions as required and specified by the NCHRP 1-37A and the NCHRP 1-40 projects.