Stiffening Effect of Fillers Based on Rheology and Micromechanics Models

The aggregate in an asphalt mixture is coated with mastic consisting of bitumen (dilute phase) and filler (particulates phase). interaction packing plays important role the properties mastics. micromechanics models from composite rheology can be used to predict stiffening effect a suspension. In this research, fillers was investigated based on mastic. frequency sweep tests dynamic shear rheometer at different temperatures were performed within linear viscoelastic range construct master curves. volume fractions expressed as compositional volumes particle shape surface texture are determined through microscopy. We six micromechanics-based potential include Maron–Pierce, Lewis Nielsen, Mooney, Krieger–Dougherty, Chong, Robinson, Hashin Models. results show that same content has effective volume. increase composite, especially high temperatures. behaviour similar identical. type affects Micromechanics modelling most accurate lower concentrations exception Chong Model. Maron–Pierce Model under-estimates for granite higher beyond 30% fraction. value maximum fraction (ϕm) Einstien coefficient (KE) Mooney model significantly other limestone granite, respectively. line equality graph shows good agreement measured predicted stiffness. It difficult precisely data any single due presence complex effects filling.