Abstract: In order to improve the pavement performance of matrix asphalt, combining with the material characteristics of SBR and recycled rubber resin, single modification and pairwise compounding of asphalt were carried out. With reference to the evaluation index of asphalt, the performance of SBR compound recycled modified rubber resin was comprehensively evaluated by using 25 ℃ penetration, softening point, cone penetration, 10 ℃ ductility, rotary viscosity and other tests. The performance differences and influencing factors of modified asphalt with different formulations were explored and compared, and the best compounding scheme was selected out. The research results show that both increasing the content of SBR and recycled rubber resin can improve the high temperature performance of asphalt to some extent. Different sources of SBR have little effect on asphalt properties, but different recycled rubber resins have different effects on asphalt properties. The main reason is that different recycled rubber resin compositions have a significant impact on the performance of asphalt. SBR has a significant improvement effect on the low-temperature performance of asphalt, and a small amount of SBR can significantly enhance the ductility of asphalt. With the increase of SBR content, the softening point of SBR modified asphalt is increased slightly, and the viscosity is also increased accordingly. Compared with SBR, the effect of recycled rubber resin on improving softening point is more significant, with an optimal content of 8%. The optimal solution for this compounding is 3% SBR and 8% recycled rubber resin.

Key words: highway engineering; asphalt properties; compound modification; recycled rubber resin; SBR

摘要： 为改善基质沥青的路用性能，结合SBR与回收橡胶树脂两者材料特征，对沥青进行单一改性与两两复配。参考沥青评价指标，利用25 ℃针入度、软化点、锥入度、10 ℃延度、旋转黏度等试验，综合评价SBR复配回收橡胶树脂改性沥青性能，探究不同配方复配改性沥青性能差异及影响因素，比选出最佳复配方案。研究结果表明：增加SBR与回收橡胶树脂掺量均能一定程度上提高沥青的高温性能；不同来源SBR对沥青性能影响差异不大，而不同回收橡胶树脂对沥青性能影响有差异，主要原因是不同回收橡胶树脂组成配方对沥青性能产生较大影响所致；SBR对沥青的低温性能改善作用明显，少量SBR即可明显提升沥青延度；随SBR掺量的增加，SBR改性沥青软化点有小幅提升，黏度也随之增加；回收橡胶树脂对软化点提升效果相比SBR更明显，8%掺量最佳；3%SBR、8%回收橡胶树脂为本次复配最佳方案。

关键词: 道路工程；沥青性能；复配改性；回收橡胶树脂；SBR