密断级配抗滑层沥青混合料设计

介绍了应用主骨架空隙填充法进行密断级配抗滑层(DGGFC)沥青混合料配合比设计的全过程,并对其各项性能进行了试验研究.试验结果表明:根据这一方法所设计的DGGFC沥青混合料属于骨架密实结构,具有良好的路用性能和表面功能,施工不离析,密实不透水,高温稳定性和耐久性好,表面均匀,具有较大的构造深度,很好地改善了表面抗滑层混合料表面构造和密实耐久性之间的矛盾.实际应用表明,DGGFC沥青混合料几乎达到SMA的使用效果,而其造价比SMA低,可作为高速公路和高等级沥青路面表面磨耗层.开展DGGFC沥青混合料的研究和推广应用对于降低工程造价、改善表面抗滑性能和延长路面使用寿命具有现实意义.

Design of dense gap-graded friction course mixture

The design procedure of a dense gap-graded friction course(DGGFC) with coarse aggregate void filling method is presented.Testing results show that a DGGFC mixture possesses a dense stone-matrix structure,good stability and almost the same texture depth as stone matrix asphalt (SMA).It also has a coarse and even surface after paving and has no separation during construction.It is durable and impermeable.It balances and improves the inherent inconsistency of asphalt mixture between the large texture depth for skid resistance and the impermeability for durability.The actual application in the Nanning-Liuzhou Expressway also shows that the performance of the DGGFC is as excellent as that of SMA,while the DGGFC mixture is cheaper than SMA.The DGGFC mixture is good for wearing course of pavement.Further research on DGGFC can be helpful for improving the surface skid resistance,prolonging the life-span period and reducing the construction costs of asphalt pavement.