硬质沥青富油混合料路用性能研究

Research on Pavement Performance of Hard-grade High-binder Asphalt Mixture

借鉴Superpave设计方法,采用富油的设计理念,设计了50#硬质沥青富油混合料。分别对常规设计和富油设计的50#硬质沥青混合料和70#沥青混合料研究,进行了大量的室内试验,全面比较了4种沥青混合料的路用性能,特别对疲劳性能进行重点分析。结果表明:采用富油的设计理念后,同一级配混合料的疲劳性能得到很大的提高。50#富油混合料与70#沥青混合料相比,高温性能基本持平,低温性能和水稳定性更好,疲劳性能有了较大的提高。由此说明50#富油混合料完全可以替代70#沥青混合料作为半刚性基层沥青路面的下面层。使用该种混合料,可以减缓半刚性基层的反射裂缝,提高路面的抗疲劳性能,从而延长路面的使用寿命。

According to the theoreties of high-binder, hard-grade high-binder asphalt mixture （HHAM） No. 50 was designed by using Superpave approach. The pavement performances, especially the fatigue- resistance performance,of 4 asphalt mixtures of asphalt No. 50 and No. 70 which using normal and high-binder designing theoretics were compared by lot of test in laboratory. The result shows that compared with the asphalt mixture No. 70, high temperature performance of the HHAM remains almost the same, low temperature performance and water stability are better, and fatigue-resistance performance is greatly improved. HHAM No. 50 can take the place of normally used asphalt mixture No. 70 for sublayer of semi-rigid type base to slow down reflective crack, raise fatigue-resistance performance and extend the life of road pavement.