Uso do S-VECD para construção de curvas características de dano de misturas asfálticas finas usando ensaios de varredura linear de amplitudes de deformação

Abstract

Several authors have used the Fine Aggregate Matrix (FAM) as an intermediate step for predicting the asphalt mixtures behavior. Recently, some authors are using the viscoelastic continuum damage (VECD) approach in fatigue damage characterization of asphalt mixtures. In this approach, cracks are considered to be homogeneous, and they are depicted as internal state variables, determined experimentally. From this approach, an accelerated test was proposed for asphalt binders’ characterization with respect to fatigue damage, called linear amplitude sweep (LAS). This work aims to use the LAS test to characterize MAF, using the simplified model (S-VECD) for damage characteristic curves construction. From the results it was concluded that it is possible to construct damage characteristic curves to the FAM with different maximum nominal sizes (MNS), but it is not possible to predict the fatigue life, since the LAS test protocol does not reach failure with the use of conventional rheometers, considering its torque capability and the samples stiffness.