1.湖南国信路面环保材料有限责任公司;2.湖南大学 绿色先进土木工程材料及应用技术湖南省重点实验室;3.湖南大学
U414
国家自然科学基金项目（面上项目）、湖南省自然科学基金
1.Hunan Guoxin Pavement Environmental Protection Material Co., Ltd;2.hunan university;3.Hunan University
The National Natural Science Foundation of China (General Program)
为恢复老化苯乙烯-丁二烯-苯乙烯三嵌段共聚物(SBS)改性沥青良好的高低温性能,本文提出由菜籽油生物沥青(COA)及聚亚甲基多苯基异氰酸酯(PAPI)组成的双重再生剂,以此同时实现老化沥青组分调节与SBS分子结构修复。通过对比单一再生与双重再生方式对短期老化SBS改性沥青物理和流变性能的影响,验证双重再生剂的有效性。根据双重再生剂对未老化的基质沥青和SBS改性沥青流变性能的影响,排除再生剂本身对SBS改性沥青相位角平台区的影响。在综合考虑双重再生效果与经济性的情况下,进一步确定双重再生剂的最佳配比。结果表明,双重再生剂可以对长期老化SBS改性沥青同时进行老化沥青组分调节以及SBS结构修复,进而有效恢复其物理与流变性能。此外,双重再生剂的最佳配比被确定为12% COA和1.25%PAPI。最终,荧光显微镜结果进一步验证了所提出的双重再生剂可以连接SBS聚合物降解片段。
With the aim of rejuvenating the excellent performance of aged SBS modified asphalt, colza oil bio-asphalt (COA) and polymethylene polyphenyl isocyanate (PAPI) were used in this study for adjusting the asphalt components and repairing SBS molecular structure, respectively. The above-mentioned dual regeneration mechanism was verified by comparing the effects of different rejuvenation components on the physical and rheological properties as well as molecular weight distribution of short-term aged SBS modified asphalt. Also, according to the change law of rheological performance of un-aged base asphalt and SBS modified asphalt with the effect of dual regeneration agent, the influence of rejuvenator itself on the phase angle platform area was excluded. Under the comprehensive consideration of the physical and rheological properties of dual recycled SBS modified asphalt, the optimal dosage of COA and PAPI was determined. The experimental results indicate that the double regenerant can not only regulate the asphalt components, but also connect the SBS molecular structure, resulting in restoring the physical and rheological performance of aged SBS modified asphalt. The optimal ratio of the dual regenerant is determined to be 12 wt% COA and 1.25 wt% PAPI. In addition, the fluorescence microscopy test results further verifies that PAPI has the ability to rebuild the SBS network structure.
