Abstract
Wax precipitation and crystallization at low temperatures limits the use of wax warm mix additives in asphalt binders. In this study, variable-temperature polarized light microscopy (VT-PLM) was used to conduct in-situ observation and quantitative evaluation of the low-temperature precipitation of four waxes in asphalt binders. A novel DSR viscosity method was also used to test the wax precipitation temperatures (WPTs) of wax-doped asphalt binders. The results showed that different waxes exhibit different optical properties and shapes after low-temperature crystallization. There are plateau temperatures (about 20–30 °C) during the cooling process. Below the plateau temperatures, the tendency for crystallized waxes to continue growing are no longer obvious. In addition to an asphalt binder with 5 % F-T wax, the WPTs obtained by the novel viscosity method are significantly higher than those obtained by the VT-PLM method, indicating that the viscosity method is more sensitive.
Published Version
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