【作者】 邢明亮；

【导师】 王秉纲；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2010， 博士

【摘要】 随着我国高速公路的快速发展与人们生活水平的提高,公众对路面的使用品质越来越重视。传统的密级配沥青混凝土路面在雨天易出现水漂、水雾等现象,进而影响车辆的行驶安全,而排水沥青路面以其优良的表面功能为众多道路工作者所关注。但排水路面沥青混合料的组成、性能、施工工艺等均不同于普通的密级配沥青混合料,对其进行深入、系统的研究对于排水路面的进一步推广应用具有重要的理论价值和工程意义。本文根据胶浆理论,分析了高粘改性沥青胶浆的组成特点,并针对不同沥青与矿粉组成的高粘度改性沥青胶浆进行了物理力学特性与流变特性研究,结果表明,与矿粉对胶浆性能的影响相比,沥青结合料性能对其有着显著的影响。不同粉胶比的高粘沥青胶浆在不同温度下表现出不同的技术特性,随着粉胶比的增大,高粘沥青胶浆感温性变大；随着温度升高,高粘沥青胶浆粘度和抗车辙因子G*/sinδ迅速降低,粘温曲线满足幂函数关系,抗车辙因子与温度之间满足指数关系。锥入度试验结果表明,粉胶比为1.2时胶浆抗剪强度的温度敏感性最小。高粘沥青胶浆是影响排水路面沥青混合料低温性能的重要因素,当粉胶比在1.2-1.4之间时,胶浆的低温性能能够很好地反映排水路面沥青混合料的低温性能。针对排水路面沥青混合料大空隙结构特点,综合骨架思想与填充原则,推荐了适合排水路面沥青混合料级配评价的FAc和FAf范围,引入新的矿料组成设计指标VMA*(VMA*=VV+V胶浆),提出了基于VMA*的排水路面沥青混合料组成设计方法。通过正交试验分析了不同筛孔通过率对混合料空隙率和连通空隙率的影响规律,提出了矿料组成设计的关键控制筛孔,为级配的进一步优化提供了依据。另外,引入矿料颗粒形状因子SFn,i,建立了基于矿料自身特性的表面积计算模型。运用三维t-模型计算沥青混合料中沥青膜厚度,并根据计算结果提出了排水路面沥青混合料沥青膜合理厚度的推荐值。综合全文研究成果,通过对原材料指标分析、高粘沥青胶浆性能研究、矿料组成设计指标的确定、沥青用量预估模型的建立以及混合料性能的评价,提出了基于VMA*的排水路面沥青混合料组成设计方法。更多还原

【Abstract】 With the rapid development of highway in China, higher and higher requirement for road-performance is put forward. Traditional dense-graded asphalt pavement has many problems which influence driving safety especially on rainy days. Meanwhile drainage asphalt pavement is one of the effective means to solve these problems. However, the composition, performance and construction technology of drainage asphalt mixture are different from dense-graded asphalt mixture. Therefore, systemic study for mortar of drainage asphalt mixture is extremely important in theoretic value and project significance for its application.In this paper, it is studied of physical and mechanical characteristics and rheological properties for different modified asphalt mortar with high viscosity composed of different asphalt binders and mineral fillers. It is found that asphalt binder is the main factor influencing the mortar properties compared to mineral filler. And different characteristics lay out of different asphalt mortar with different rate of filler to asphalt at different temperature. Meanwhile, the results of DSR and Brookfield test indicate that temperature susceptibility of asphalt mortar with high viscosity increases with the increasing of rate of filler to asphalt, and viscosity of asphalt mortar and rut factor G*/sinδboth decrease with increasing of temperature. Also it can be shown that viscosity-temperature curves satisfies power function and rut factor and temperature satisfies index function. The cone penetration test indicates that temperature susceptibility of asphalt mortar is the lowest when the rate of filler to asphalt is 1.2. Bending test results at low temperature of-10℃for mortar and mixture show that asphalt mortar is one main factor influencing the performance of mixture and low temperature performance of asphalt mortar can imply that of mixture perfectly in the rate of filler to asphalt of 1.2-1.4.Considering high void ratio and skeleton structure in drainage asphalt mixture, new test ranges for FAc and FAf are suggested adapting to the gradation of drainage asphalt mixture. Meanwhile, a new design index for mineral composition, VMA*, is introduced. Consequently, the new method for design of drainage asphalt mixture based on VMA* is put forward. Tests for influence of passing percentage to air void and effective air void have been done in the lab, and a key sieve is put forward for mineral composition design which provides reference for gradation optimizing. Besides, shape factor SFn,i of aggregate is introduced to establish the model for surface areas calculation. Finally asphalt film thickness is calculated with 3D t-model and reasonable thickness of 13μm is suggested for drainage asphalt mixture. Collecting the research findings in this paper, composition design method for drainage asphalt mixture based on VMA* is put forward by analyzing materials indices, studying asphalt mortar properties, determining aggregate composition design index, building prediction model for asphalt content and evaluating mixture performance.更多还原