SBS/胶粉复合改性沥青研究进展与性能评价

为进一步推动SBS/胶粉复合改性沥青技术的发展，梳理总结了国内外SBS/胶粉复合改性沥青的原材料选用情况与制备工艺，明确了其较优掺配方案、制备方法，探讨了SBS/胶粉复合改性机理，全面调查了国内外SBS/胶粉复合改性沥青流变性能与基本性能，对比评价了SBS/胶粉复合改性沥青与基质沥青、SBS沥青、橡胶沥青的性能差异，并基于数理统计结果与沥青相关规范，划分了SBS/胶粉复合改性沥青性能等级。结果表明：SBS/胶粉复合改性沥青制备工艺以高速剪切或胶体磨法为主，常用掺配方案及工艺为SBS 2%~3.5%、胶粉10%~20%、沥青加热温度170℃~180℃、剪切速度4 000~5 000 r·min^-1；SBS/胶粉对沥青的复合改性过程以物理作用为主，辅以部分化学反应，且沥青组分、胶粉处理工艺将会显著影响改性材料分散状态；SBS与胶粉复合可使两者优势互补，其复合改性沥青的路用性能大幅提高；与基质沥青、橡胶沥青、SBS沥青相比，SBS/胶粉复合改性沥青的高低温性能优势显著，流变分级基本满足PG 76和PG-22；综合统计箱形图数据节点与相关沥青规范，将复合改性沥青性能划分为优秀、良好、中等、较差4个等级，并推荐了适用于寒区、温区、热区的SBS/胶粉复合改性沥青性能要求。鉴于当前SBS/胶粉复合改性沥青技术研究已有长足进展，建立室内改性工艺与工厂末端生产关系、探究耦合工况下性能演变规律、优化储存稳定技术与施工配套工艺将是其推广亟待攻关的方向。

Research Progress and Performance Evaluation of SBS/CR-modified Asphalt

Herein, the raw material selection and preparation process of the asphalt were summarized to further promote the development of SBS/CR asphalt technology in this study. A reasonable mixing scheme and preparation method were recommended. The mechanism of SBS/CR modification was discussed. Moreover, the rheological and basic properties of the asphalt were investigated. The performance differences between SBS/CR-modified asphalt, base asphalt, SBS asphalt, and rubber asphalt were compared, and the performance grades of SBS/CR-modified asphalt were divided based on the statistical results and specifications. The results show that SBS/CR-modified asphalt is mainly prepared by high-speed shear or colloidal milling. The common mixing methods are as follows:2%-3.5% SBS, 10%-20% crumb rubber, 170℃-180℃ asphalt heating temperature, and 4 000-5 000 r·min^-1. In addition, the composite modification process of SBS/CR on asphalt involves mainly physical action supplemented by chemical reactions, asphalt components, and crumb rubber treatment methods, which significantly affects the dispersion state of modified materials. Compared with base asphalt, rubber asphalt, and SBS asphalt, the comprehensive performance of SBS/CR-modified asphalt is better, and its rheological classification basically meets the requirements of PG 76 and PG-22. According to the box chart data and asphalt specifications, the performance of the modified asphalt can be divided into four grades:excellent, good, medium, and poor. The performance requirements of SBS/CR-modified asphalt suitable for cold, warm, and hot regions have been recommended. In view of the great progress in the research of SBS/CR-modified asphalt technology, it is urgent to establish the relationship between the indoor modification process and factory-end production, explore the performance evolution law under coupling conditions, and optimize its storage stability technology and construction supporting technology.