Viscoelastic properties of polymer modified bitumen in Warm Mix Asphalt technology in terms of ageing

Abstract

The paper presents the influence of ageing on the viscoelastic properties of the polymer modified bitumen (PMB) in WMA technology. The base bitumen was PMB 45/80-65. Fischer-Tropsch synthetic wax (SW) and the liquid surface active agent (FA) ware used as a bitumen viscosity-reducing modifiers. All properties of binders have been determined before ageing (NEAT) and after long-term ageing (RTFOT+PAV). The research area includes the study basic properties (softening point and Fraass breaking point) and rheological characteristics (zero shear viscosity ZSV, complex viscosity η0 and rutting factor G*/sinδ). It was found that fatty amine additive works as a ageing inhibitor. The ageing process revealed degradation process in polymer. This phenomenon is more explicit in the bitumen modified with wax than the fatty amine.