【作者】 廖陈林；

【导师】 武建民；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 我国高速公路沥青路面在使用期限内往往过早出现车辙、水损坏、开裂等一系列问题,路面破坏比较严重,本文从路面结构设计出发,对厚层沥青混凝土路面结构与材料设计进行研究分析。通过将沥青路面分为正常厚度沥青路面结构和厚层沥青路面结构两种,利用弹性层状理论计算程序Bisar计算分析了沥青路面面层在总厚度不变,采用不同分层条件下,沥青面层内部最大剪应力大小的变化、分布位置的变化及对面层抗车辙稳定性的影响;同时对沥青面层内部拉应力峰值大小的变化和分布位置的变化及对面层抗疲劳开裂性能的影响。结果表明,采用厚层沥青路面结构,其抗车辙稳定性和抗疲劳开裂性均得到了增强。采用旋转压实成型方法,利用正交试验设计,对厚层沥青混凝土AC-25的CA比、油石比以及设计旋转压实次数三因素进行极差和方差分析,确定了各因素对沥青混合料密实度的影响程度。通过沥青混合料密实曲线来评价沥青混合料的压实特性,采用反应压实特性的K1、K2、CEI、TDI四个参数,来评价沥青混合料在施工阶段的压实难易程度以及在使用阶段混合料被追密的难易程度,由此推荐了适用厚层沥青混凝土AC-25的最优级配。选用不同沥青混合料级配进行车辙对比实验,验证密实曲线分析结果,并对选用的沥青混合料级配进行水稳定性试验。更多还原

【Abstract】 Expressway asphalt pavements expose series of problems early in their service life in our country ,such as rutting、water damage and cracks etc. The pavement destruction is serious. In this paper, the research and analysis of the design for structure and material of thick layer asphalt concrete pavement were made based on the design of pavement structure.Asphalt pavement is divided into two asphalt pavement structures which include normal thickness and thick layer. Elastic layer theory calculation program-Bisar was used to analyze the change of maximum shear stress and distribution location and the effect of the stability of anti-rutting on the whole thickness on the asphalt pavement surface fixed and differ layered. It also analyzed the change of the peak tensile stress and distribution location of the inner of asphalt pavement surface for the effect of crack property of anti-fatigue. The result showed that the stability of anti-rutting and crack property of anti-fatigue was enhanced by using thickness asphalt pavement structure.Three factors (CA ratio,asphalt content, gyratory compaction times)were analyzed by range and variance analysis which ascertain the effect degree of every factor to the asphalt mixture compactness using Superpave Gyratory Compactor molding method and orthogonal experiment design. Compaction characteristics of asphalt mixture could be evaluated with densification curves of asphalt mixture. The difficult degree of compaction in construction stage and compacting in using stage for asphalt mixture were evaluated by using four parameters (K1,K2, CEI, TDI).The optimal gradation of thick layer asphalt concrete AC-25 could be recommended. Different asphalt mixture gradations were selected to do rutting comparison test. The analysis result of densification curves was verified. And the chosen asphalt mixture gradations were used to do water stability test.更多还原