Abstract
In the mechanistic analysis of asphalt mixtures, the complex modulus is a fundamental parameter for the formulation of constitutive models of its structure, since it represents the portion of elastic behavior, typical of the aggregate of the mixture, as well the viscous behavior, due to the asphaltic binder. The first is represented by the dynamic modulus and the second by the phase angle. Both parameters depend on the temperature and the loading rate. As it is not possible to measure them for all temperature and loading, functions that represent these parameters are obtained, using both generic fitting as predictive models. Various models for the dynamic modulus of asphalt composites with calcined clay, obtained by four-point bending tests, were analyzed. It is observed that both method, multiple nonlinear regressions as well mastercurves, can be used efficiently, with translation of frequency and temperature. Phenomenological equations can also be used accurately, by which it is possible to extrapolate the data, yielding the equilibrium value of the dynamic modulus when the frequency tends to infinity.
Keywords:
asphalt mix; dynamic modulus; calcined clay; mathematical modeling; numerical modeling
