Performance and Mechanisms of Wax-modified SBS High Viscosity Asphalt

Abstract

In order to select waxes demonstrating superior warm-mixing performance, five kinds of waxes used for warm-mixed additives (WMAs) were introduced: modified polyamide wax (MPW), refined Fischer-Tropsch wax 1 (RFW1), refined Fischer-Tropsch wax 2 (RFW2), specialty wax (SW), and oxidized polyethylene wax (OPW), to study the effects of their performance and the mechanism compared with the Sasobit warm-mixed additive (SWMA) on the performance of Styrene-Butadiene-Styrene high viscosity asphalt (SHVA). Five types of waxes were added to SHVA to prepare wax-mixed asphalt. The physical and rheological properties of the warm-mixed SHVAs were investigated by basic performance tests, Brookfield viscosity tests, DSR and DSC tests, and the microstructure of the asphalt was observed by FTIR tests and fluorescence microscope. The experimental results show that there is no chemical reaction occurred between the wax additives and the asphalt after the wax materials were added. And all the six waxes have good warm-mixing effect. Considering the effects on the performance of modified asphalt, the warm-mixing effect of RFW2 and its rheological performance of warm-mixed SHVA is better than that of conventional SWMA.

Keywords

SBS high-viscosity asphalt / wax / warm-mixed additive / physical properties / rheological properties / micromorphology

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