Estimation of Resilient Modulus Constitutive Model Parameters for Unbound Coarse Materials for MEPDG

Abstract

In this study, 18 different unbound aggregates were collected from various locations of Idaho and several characterization tests were conducted in the laboratory. The resilient modulus of these collected aggregates was measured with the help of repeated load triaxial (RLT) testing. The results of the laboratory characterization tests were used to develop a regression model for the Mechanistic Empirical Pavement Design Guide (MEPDG) model parameters (e.g., k1, k2, k3). The k1, k2, and k3 models were correlated to compaction and gradation characteristics of the test aggregates. The proposed models can be used to predict the MEPDG model regression coefficients for unbound layers in AASHTOWare Pavement ME Design software. The resilient modulus measured in the laboratory and the resilient modulus predicted with these ki models are found to be in good agreement.