Preparation and Properties of SBS Modified Deoiled Asphalt and Slurry Blends

Abstract

Deoiled asphalt (DOA) and slurry are by-products of petroleum refining process. In this paper, blending asphalt (DST) based on DOA, slurry and vacuum gas oil and SBS modified DST (SMDST) were prepared. The aging resistance of SMDST was investigated by thermal aging (TA) and ultraviolet (UV) aging. Meanwhile, the chemical structure and microstructure of SMDST before and after aging were characterized by Fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy. The results showed that the softening point, ductility at 5 °C and low temperature flexibility of SMDST increased gradually with the increase of SBS content. When SBS content was 12 wt%, the softening point, ductility at 5 °C and low temperature flexibility of SMDST were 105 °C, 55 cm and -25 °C, respectively. After TA and UV, the low temperature flexible reductions of SMDST with 12 wt% SBS were 3 °C and 2 °C, respectively, which demonstrated that aged SMDST still had good crack resistance in low temperature. FTIR analysis indicated that the carbonyl (C=O) and the sulfoxide (S=O) characteristic peaks of SMDST were enhanced after aging to a certain extent. However, the fluorescence microscope observation showed the network structure of SMDSB was not damaged significantly, which implies that SMDST has a favourable anti-aging performance.