Stiffening and Toughening of Asphalt Mastic Induced by Bitumen–Mineral Selective Molecular Adsorption and Nanostructural Reconstruction

Asphalt mastic is the most important binder in asphalt mixtures and its rheology inevitably influenced by mineral aggregates. Due to little consideration that has been paid aggregates’ effects, rheological properties of films have not accurately characterized for present method. Therefore, this study aimed investigate characteristics affected aggregates reveal fundamental mechanism interfacial interaction. The results suggest increased stiffness toughness within linear nonlinear viscoelastic regions. on limestone had a higher modulus than basalt below 35 °C, ratio reached up 1.18. However, surpassed over 50 maximum 2.17. contact with failure strain basalt, ratios which 1.60 1.32, respectively. macrorheological are closely related nanostructures intermolecular interactions bitumen–mineral systems. coexistence stable bitumen nanostructure an adsorbed layer calcite substrate provided strong bonding energy high resistance external shear deformation, leading limestone. Abundant metal ions from augite albite diffused into destroyed nanostructure, decreasing stability mastic–basalt interface system. non-bond bitumen-calcite was 14.15% bitumen-albite, stress bitumen-albite 6.8. reinforced bitumen, colloidal structure. This provides understanding characterization