基于使用要求的沥青混合料优化设计研究

发布时间：2018-04-23 07:12

本文选题：道路工程 + 使用要求　；参考：《长安大学》2015年硕士论文

【摘要】：西宁南绕城高速公路与新建成的西宁过境高速公路共同组成西宁市绕城高速环线。西宁南绕城公路建设,为破解西宁市“东西拥挤、南北不畅”的交通困局,进而为“扩市提位”提供了基础支撑。然而西宁地区沥青路面的常出现纵向形变、纵向裂缝、横向裂缝和车辙等病害,究其主要原因是沥青混合料级配以细粒式密级配AC-13偏细型材料为主、设计不满足区域要求,为保证优良的路用性能,必须优化沥青混合料级配设计。本文在满足结构性要求的基础上对沥青混合料关键性能指标与设计参数进行研究分析,结合西宁南绕城高速公路项目,建立矿料级配均衡优选方法,确定最佳油石比,铺筑试验路并进行观测,验证混合料路用性能;为混合料施工提供技术指导。主要内容如下:(1)分析了矿料级配对沥青混合料路用性能的影响,在对比上中下面层的关键性指标要求的基础上,针对各层组成材料提出了技术要求,同时系统研究了现有矿料级配设计方法和关键参数,提出了沥青混合料矿料级配优化设计和关键参数。(2)在运用双曲线模型的基础上,经Super pave设计参数检验、贝雷法设计参数评价、马歇尔试验体积指标评价和基于路用性能的矿料级配优化综合比选,确定了沥青稳定碎石ATB-25下面层、AC-20中面层和AC-13上面层混合料矿料级配构成。(3)在对比常用沥青混合料最佳油石比设计方法的基础上,提出了最佳油石比优化设计方法,设计了沥青稳定碎石ATB-25下面层、AC-20中面层和AC-13上面层油石比。(4)对实体工程沥青路面施工质量进行了全面检测,验证了本文沥青混合料材料选型、矿料级配均衡优选及最佳油石比确定等研究成果的可行性。
[Abstract]:The Xining South Roundabout Expressway and the newly built Xining Transit Expressway constitute Xining City Roundabout High-speed Ring Line. The construction of the road around the city in the south of Xining provides the basic support for the construction of the highway in Xining, which can solve the traffic difficulties of "east and west crowded, north and south unobstructed" in Xining city. However, longitudinal deformation, longitudinal cracks, transverse cracks and rutting are often found in the asphalt pavement in Xining area. The main reason is that the gradation of asphalt mixture is mainly fine grained AC-13 material, and the design does not meet the regional requirements. In order to ensure excellent road performance, asphalt mixture gradation design must be optimized. On the basis of meeting the structural requirements, this paper studies and analyzes the key performance indexes and design parameters of asphalt mixture, establishes the method of mineral aggregate gradation equilibrium selection, and determines the best oil / stone ratio in combination with the Xining South Round-the-City Expressway Project. Build and observe the test road to verify the pavement performance of the mixture and provide technical guidance for the mixture construction. The main contents are as follows: (1) the influence of mineral aggregate gradation on pavement performance of asphalt mixture is analyzed. On the basis of comparing the key index requirements of upper, middle and lower surface layer, the technical requirements are put forward for each layer composition material. At the same time, the existing methods and key parameters of ore aggregate gradation design are systematically studied, and the optimization design of asphalt mixture aggregate gradation and the key parameters are put forward. On the basis of using hyperbolic model, the design parameters are tested by Super pave. Evaluation of design parameters by Bayley method, evaluation of volume index of Marshall test and comprehensive comparison and selection of mineral aggregate gradation optimization based on road performance, On the basis of determining the aggregate gradation composition of asphalt stabilized macadam ATB-25 lower layer (AC-20) and AC-13 upper layer mixture, the optimum design method of optimum asphalt aggregate ratio is put forward on the basis of comparing the common design method of asphalt mixture's optimum asphalt stone ratio. The asphalt-stabilized macadam ATB-25 lower layer AC-20 middle surface layer and AC-13 top layer oil-stone ratio. 4) have carried on the comprehensive inspection to the entity engineering asphalt pavement construction quality, has verified the asphalt mixture material selection in this paper. Feasibility of ore gradation equilibrium optimal selection and determination of optimum oil / stone ratio.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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