Modelling the permanent deformation of unbound granular materials in pavements

An existing permanent deformation (PD) model for the unbound granular materials (UGMs) in pavements, developed based on multistage (MS) repeated load triaxial (RLT) tests, was modified to better suit field conditions and software applications. The calibrated a few UGMs with series of moisture contents (w) using MS (to include stress-history effect) RLT tests validated by predicting PD under different sets stress levels w’s. Generally, it exhibited improved predictions over Mechanistic-Empirical Pavement Design Guide (MEPDG) model. further applied implemented pavement design entitled ERAPave PP, data from accelerated testing three structures employing heavy vehicle simulator (HVS). Based additional guideline ranges material parameters types presented.