DIGITAL SIMULATIVE TEST OF ASPHALT MIXTURES USING FINITE ELEMENT METHOD AND X-RAY TOMOGRAPHY IMAGES Wang, Yongping Dissertation submitted to the faculty of Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Civil Engineering Wang, Linbing, Chair Dove, Joseph Flintsch, Gerardo Sotelino, Elisa Trani, Antonio May 10, 2007 Blacksburg, VA Keywords: Tomography Imaging, Asphalt Pavement Analyzer, Permanent Deformation, Viscoplasticity Copyright 2007, Yongping Wang