TRB’s National Cooperative Highway Research Program (NCHRP) Report 719: Calibration of Rutting Models for Structural and Mix Design highlights proposed revisions to the Mechanistic–Empirical Pavement Design Guide (MEPDG) and software to incorporate three alternative rut-depth prediction models that rely on repeated load (tri-axial) permanent deformation or constant height testing to provide the requisite input data.
The report also suggests revisions to the MEPDG that would provide for revised coefficients for the original and alternative rut-depth transfer functions or prediction models derived from material properties measured in the laboratory and pavement performance data.