【摘要】 以苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）、废旧胶粉作为主要原材料制备了新型复合抗裂沥青，采用响应曲面法确定了新型复合抗裂沥青的掺配方案。在此基础上，对新型复合抗裂沥青进行了基本性能测试、布氏黏度试验、测力延度试验、温度扫描试验和低温弯曲梁流变试验，对比评价了新型复合抗裂沥青的黏温特性和高低温流变性能等性能。最后，基于荧光显微图像，分析了新型复合抗裂沥青的改性机理。结果表明，新型复合抗裂沥青原材料的最佳优化方案为：SBS改性剂掺量4%（质量分数，下同），胶粉掺量15%，增韧剂掺量4%。新型复合抗裂改性沥青具备优异的低温性能及抗拉伸能力，延度可达到54 cm，弹性恢复可达到99%，相比常规SBS/胶粉复合改性沥青低温延度提升78%，弹性恢复性能提升11%；从微观角度来看，复合抗裂改性沥青通过多种改性剂的协同交联，形成了均匀紧密的微观结构，显著增强了抗裂性能，能够更好应对温度变化和机械应力的影响。更多还原

【Abstract】 This study developed a novel composite crack-resistant asphalt by modifying asphalt with styrene-butadiene-styrene(SBS) and waste rubber powder, with the optimal formulation determined through response surface methodology. The optimized composition consisted of 4 wt% SBS, 15 wt% rubber powders, and 4 wt% toughening agent. Comprehensive performance evaluation was conducted using basic property tests, Brinell viscosity measurements, tensile testing, temperature scanning, and bending beam rheometry, and the results revealed superior low-temperature performance and tensile resistance, with exceptional ductility(54 cm) and elastic recovery(99 %). Compared to conventional SBS/rubber powder-modified asphalt, the currently developed asphalt demonstrated 78 % greater ductility and 11 % improved elastic recovery. Fluorescence microscopy analysis indicated that the enhanced performance stemmed from the formation of a uniform, compact microstructure through synergistic crosslinking of multiple modifiers. This unique microstructure provides excellent resistance to temperature fluctuations and mechanical stress, making the composite particularly effective for crack prevention.更多还原