| Abstrakt: |
To verify the performance of self-developed high viscosity modified (HVM) asphalt binder with styrene–butadiene–styrene (SBS) composite modifier, the various branched and linear SBS modifiers with different mixing ratios were selected to prepare HVM asphalt binder, and the mix proportion of SBS modifier in HVM asphalt binder was also optimized. The fluorescence microscope, multiple stress creep recovery (MSCR) test, bending beam rheometer (BBR) test, improved boiling water test and viscosity test were used in this study, and the different properties of HVM asphalt binder with SBS composite modifier, HVM asphalt binder with linear SBS modifier, HVM asphalt binder with Tafpack-super (TPS) modifier (TPS-HVM asphalt binder) and HVM asphalt binder with SINOTPS modifier (SINOTPS-HVM asphalt binder) were evaluated. The results show that the mixing ratio of linear SBS modifier and branched SBS modifier in the composite modifier is 2:1, the dispersible uniformity and road performance of HVM asphalt binder with the composite modifier are better, and the modification of composite modifier with SBS-1301 and SBS-4303 modifier is greater than LG-501 and LG-411, LCY-3501 and LCY-3411. The performance of HVM asphalt binder with the composite modifier was significantly influenced by the mix proportion and structure of SBS modifier. The dispersion effect of SBS modifier is superior to TPS and SINOTPS additive. The high-temperature performance, adhesion and viscosity of HVM asphalt binder can be increased by addition of SBS composite modifier, but the low-temperature performance of HVM asphalt binder is decreased slightly. The flexibility of HVM asphalt binder with linear SBS modifier at low temperature is better than SBS composite modifier. Compared to TPS-HVM and SINOTPS-HVM asphalt binder, the low-temperature performance and adhesion of HVM asphalt binder with SBS composite modifier are relatively good, while the viscosity of HVM asphalt binder with SBS composite modifier under high temperature is lower. The elasticity of different HVM asphalt binders decreases in order SINOTPS-HVM asphalt binder, HVM asphalt binder with SBS composite modifier and TPS-HVM asphalt binder. This study will be provided more options for the asphalt binder of porous asphalt pavement and steel deck pavement. |
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