Backcalculation of dynamic modulus from resilient modulus test data

For the past few decades, the stiffness of asphalt material has been commonly characterized by means of resilient modulus. However, the resilient modulus is not a fundamental material property, and hence, the concept of resilient modulus has been subsequently diminished in the latest Mechanistic-Empirical Pavement Design Guide (MEPDG). Although the MEPDG could not endorse the resilient modulus as the primary means for asphalt concrete characterization, it has been a primary mixture test, and a considerable amount of laboratory testing has been conducted to date. In this paper, an analysis methodology for backcalculating the dynamic modulus from the resilient modulus test data is introduced. The strong advantage of such a methodology is that the existing resilient modulus data can be reused for estimating the dynamic modulus. The approach would significantly save time and effort in reevaluating the dynamic modulus of asphalt mixture for which the resilient modulus test data are available.