ABSTRACT

Perpetual pavement has become an important research area of highway development in China. Ensuring the durability of materials is an essential measure to achieve the goal of perpetual pavement construction. This paper documents a study on how to prepare SBS modifier/crumb rubber composite-modified asphalt (SRA) by testing based on an orthogonal experimental design to obtain the optimum proportion of crumb rubber, SBS modifier, and compatible stabiliser. We used needle penetration, ductility, softening point, 60°C dynamic viscosity and segregation as evaluation indexes to obtain optimal ratios. Then, we analysed the performance of SRA and compared it with that of other asphalts, such as base asphalt, SBS-modified asphalt, rubber asphalt and high-viscosity-modified asphalt. We considered that rubber powder and SBS modifier compound-modified asphalt can form a cross-linked stable structure in asphalt and greatly improve the rheological and antifatigue properties of asphalt. Further, we conducted a comparative experiment to study the performance of asphalt mixtures, and we concluded that SRA has better road performance and can be used as an anti-wear layer of perpetual pavement.

摘要

永久性路面已成为我国公路发展的重要研究领域。确保材料的耐久性是实现永久性路面建设目标的必要措施。本文通过基于正交试验设计的试验研究如何制备SBS改性剂/橡胶粉复合改性沥青（SRA），以获得橡胶粉、SBS改性剂和相容稳定剂的最佳配比。我们以针入度、延展性、软化点、60℃动态粘度和偏析作为评价指标，得到最佳配比。然后，我们分析了 SRA 的性能，并将其与其他沥青（如基础沥青、SBS 改性沥青、橡胶沥青和高粘度改性沥青）的性能进行了比较。我们认为橡胶粉和SBS改性剂复合改性沥青可以在沥青中形成交联稳定结构，大大提高沥青的流变性和抗疲劳性能。此外，我们还进行了沥青混合料性能对比试验，得出结论：SRA具有更好的路用性能，可作为永久性路面的抗磨层。