基于正交试验的SEBS/橡胶粉复合改性沥青性能分析

为获得性能优异的改性沥青混合料,选用苯乙烯-乙烯-丁二烯-苯乙烯(styrene ethylene butadiene styrene,SEBS)和橡胶粉对沥青进行复合改性,采用正交试验设计优化复合改性沥青的掺配方案,同时选用三大指标、布氏旋转黏度、短期老化模拟(RTFOT)等试验对复合改性沥青、橡胶改性沥青、SEBS改性沥青、基质沥青的黏滞性、高温稳定性、低温抗裂性、感温性及抗老化性进行对比分析,综合评价其路用性能.正交试验结果表明,SEBS、CR的最优复合掺量分别为5％和16％,最佳制备方案为SEBS和CR同时加入;采用本文方法制备的SEBS/CR复合改性沥青可降低沥青感温性能,改善低温抗裂性能和抗老化性能,对高温稳定性的改善效果尤为明显;此外需考虑目标需求及温差变化较大时复合改性沥青的掺配比例.

Performance analysis of compound modified asphalt with SEBS and rubber powder based onorthogonal test

To obtain modified asphalt mixtures with excellent properties, SEBS and crumb rubber (CR) are used for compound modification of the asphalt, and orthogonal test design is adopted to optimize the blending scheme of composite modified asphalt. At the same time, the three major indicators, brookfield viscosity, short-term aging (RTFOT) tests were used to evaluate the viscosity, high temperature stability, low temperature crack resistance, temperature sensitivity and aging resistance of composite modified asphalt, rubber modified asphalt, SEBS modified asphalt and matrix asphalt. Orthogonal test results show that the optimal compounding amounts of SEBS and CR are 5% and 16% respectively, and the best preparation scheme is to add SEBS and CR at the same time. The SEBS/crumb rubber composite modified asphalt prepared by this method can reduce the temperature sensitivity of asphalt, improve the low-temperature crack resistance and aging resistance performance, and the effect of improving the high-temperature stability is particularly obvious. In addition, it is necessary to consider the target demand and the proportion of compound modified asphalt when the temperature difference changes greatly.