Effect of State of Stress on the Resilient Modulus of Base Layer Containing Reclaimed Asphalt Pavement

ABSTRACT The use of Reclaimed Asphalt Pavement (RAP) as a base layer is a sustainable rehabilitation method and reduces local agency cost. Proper characterizations of the stress-dependent behavior of pavement layers have significant impact on the accuracy of pavement response predictions. This research examines which constitutive model is the most appropriate for predicting the resilient behavior of RAP as a base layer. The Resilient modulus (MR) was examined in the laboratory for specimens containing different ratios of RAP and aggregate. The MR of RAP/aggregate blends were higher, less sensitive to bulk stress and more sensitive to confining pressure compared to base aggregate. The MEPDG model that presented the nonlinear resilient behavior of unbound layers fitted the RAP material and was mathematically stable.