Local Practice of Assessing Dynamic Modulus Properties for Washington State Mixtures

The dynamic modulus (|E*|) is one of the key elements of a mechanistic-empirical-based flexible pavement design procedure. The dynamic modulus is used to characterize the material properties of asphalt mixtures and to determine the stress-strain responses of a pavement at different loading conditions. The dynamic modulus is also a direct input parameter in several pavement performance models to estimate field fatigue cracking and rutting performance. To provide a better understanding of the local materials, this study aimed to test the typical asphalt mixtures used by the Washington State Department of Transportation and to establish a material catalog for dynamic modulus. In this study, seven plant-produced mixtures from five regions of Washington State were sampled and tested. These mixtures represented the typical asphalt binder, gradation, and mix designs of the state. One warm-mix asphalt project was also included in the analysis. On the basis of the experimental results, it was found that mix proper...