沥青稳定碎石基层设计方法研究

对沥青稳定碎石基层所处的自然条件和行车条件及其性能要求进行了分析,并与沥青混凝土面层进行了对比.对于沥青稳定碎石来说,设计中考虑的主要因素是抵抗永久变形和抗疲劳能力,由于沥青稳定碎石基层的集料的最大尺寸和厚度均大于面层沥青混凝土,传统的马歇尔设计方法并不适合于设计沥青稳定碎石基层混合料.本文以能提高抗车辙和耐久性的贝雷法来设计矿料级配,以混合料的最大内粘聚力为主要指标来确定沥青稳定碎石混合料的最佳沥青用量.结果表明,用此方法设计的沥青稳定碎石混合料具有极大的抗永久变形和抗疲劳能力.

Reseach on design method of asphalt-treated base

This paper analyzes the performance requirements of asphalt-treated base and compares the environmental condition and vehicle condition of asphalt-treated base with those of wearing surface’s asphalt material.For asphalt-treated base,the main factors considered in design are abilities of resistance to permanent deformation and resistance to fatigue on the bottom of the base.Because the maximal size of aggregate and the thickness of asphalt-treated base are all greater than those of surface’s asphalt mixture,traditional Marshall design method is not suitable for designing mixture of asphalt treated base.The paper uses Bailey method for designing graduation,recommends a maximal cohesion index for designing mixture of asphalt-treated base,the results show that mixture using this design method has best resistance to permanent deformation and resistance to fatigue on the bottom of base.