Abstract: The effect of two accelerators,dithiodimorpholine and bis (dimethylthiocarbamyl) disulfide, at different ratios on the properties of SBS modified asphalt was investigated. The research indicates that with the addition of single or complex accelerator, the properties of SBS modified asphalt are highly improved, especially for the system with complex accelerator. In the case of the appropriate mix ratio and content, the softening point increases remarkably and the penetration decreases. The ductility is weakly affected and the segregation phenomenon is not obvious. The substantial increase of rut factor, which is G*/sinδ, leads to the obvious improvement of high temperature performance and the anti-rut ability. Furthermore, the viscosity of SBS modified asphalt at the temperature in construction is not highly affected by adding the complex accelerator, which means asphalt mixing and paving will not be influenced.

Key words: road engineering, accelerator, SBS, modified asphalt

摘要： 研究了两种促进剂（二硫代二吗啉和四甲基硫代过氧化二碳酸二酰胺）在不同配比下，对SBS改性沥青性能的影响。研究表明：所用单一或复合促进剂加入后，均可明显提升SBS改性沥青的性能，其中复合促进剂效果更加显著，在合适的配比和掺量下，软化点大幅提高，针入度降低，对延度影响小，离析现象不明显，还可大幅增大车辙因子G*/sinδ，高温性能提升显著，抗车辙性能更佳。此外，这种复合促进剂对SBS改性沥青施工温度下的黏度影响不大，不影响拌和和摊铺。

关键词: 道路工程, 促进剂, SBS, 改性沥青