贵州高速公路乳化沥青冷再生混合料技术性能研究

发布时间：2018-05-08 00:18

本文选题：冷再生技术 + 乳化沥青　；参考：《重庆交通大学》2015年硕士论文

【摘要】：随着经济水平不断提高,贵州省高速公路进入了快速发展时期。可以预计,省内公路特别是重载道路大中修涉及的路面深度会明显加大,旧料的处置和利用将成为大中修方案不可回避的问题。通过应用沥青路面冷再生技术,将这些材料再次应用到道路工程建设上,这样不仅路用性能达到要求,不少能源和资源得到节约,还能使环境得到保护,实现可持续发展。本文依托“山区高速公路沥青路面冷再生技术体系的研究”项目,对乳化沥青冷再生混合料技术性能进行研究。对旧路历史信息、路况及病害进行调查和分析,获得现场芯样厚度和空隙率。对RAP性质进行试验分析:测量RAP含水率,沥青含量和性质,评价了RAP抽提后的级配。对沥青路面再生技术分类进行研究,分析各类技术的优缺点;探讨实际工程中再生方式的选择;最后确定本路段选择乳化沥青冷再生进行路面维修。从沥青的组分和性质,老化和再生机理,乳化机理入手,研究乳化沥青冷再生混合料工作原理。本文总结了国内外冷再生路面结构设计方法的异同,为本文结构设计提供参考。对各种设计指标进行分析,并结合我国沥青路面破坏状况,将选择再生层底拉应力控制疲劳开裂和旧路顶面压应变控制永久变形,同时加入反映结构刚度的弯沉指标进行路面设计。对冷再生路面厚度进行研究,并通过BISAR软件计算各种厚度组合在荷载作用下的力学反应量,总结冷再生结构层在不同回弹模量和厚度条件下,应力、应变和弯沉的变化规律,得出满足各种交通等级的结构层最小厚度,最后推荐了冷再生沥青路面典型结构。分析乳化沥青冷再生社会效益和环保效益,其具有增加道路使用年限、对有关产业和地区经济带来积极影响、减少材料费用、节约土地资源、避免水土流失和减少沥青污染等优点。如果从整个道路使用年限考虑,乳化沥青冷再生基层能够减少维修费用支出。通过本文研究,乳化沥青冷再生混合料有着不错的路用性能,应用于基层或下面层时路面结构有着很好的承载力。该项技术经济环保,在路面维修工程中有着广阔的发展前景。
[Abstract]:With the continuous improvement of economic level, Guizhou Expressway has entered a period of rapid development. It can be predicted that the depth of the pavement involved in the overhauling of the highway, especially the heavy haul road, in the province will be obviously increased, and the disposal and utilization of used materials will become an unavoidable problem in the overhauling scheme. Through the application of cold recycling technology of asphalt pavement, these materials are again applied to road engineering construction, which not only meets the requirements of road performance, but also saves many energy and resources, and can also protect the environment and realize sustainable development. Based on the project of "Research on Cold Recycling Technology system of Asphalt pavement in mountainous area", the technical performance of emulsified bitumen cold recycled mixture is studied in this paper. The historical information, road condition and disease of the old road were investigated and analyzed, and the core sample thickness and void ratio were obtained. The properties of RAP were analyzed. The moisture content, asphalt content and properties of RAP were measured, and the gradation of RAP extraction was evaluated. The classification of asphalt pavement regeneration technology is studied, the advantages and disadvantages of various technologies are analyzed; the selection of regeneration methods in practical engineering is discussed; finally, the selection of emulsified asphalt cold recycling for pavement maintenance is determined. Starting with the composition and properties of asphalt, aging and regeneration mechanism and emulsifying mechanism, the working principle of cold recycled asphalt mixture is studied. This paper summarizes the similarities and differences of cold regenerated pavement structure design methods at home and abroad, and provides a reference for the structure design of this paper. Based on the analysis of various design indexes and combined with the failure situation of asphalt pavement in China, the tensile stress control fatigue cracking at the bottom of the regenerated layer and the compression strain on the top of the old road are selected to control the permanent deformation. At the same time, the deflection index reflecting the stiffness of the structure is added to the pavement design. In this paper, the thickness of cold recycled pavement is studied, and the mechanical reaction of various thickness combinations under load is calculated by BISAR software, and the variation law of stress, strain and deflection of cold regenerated structure layer under different elastic modulus and thickness is summarized. The minimum thickness of structure layer is obtained, and the typical structure of cold recycled asphalt pavement is recommended. This paper analyzes the social and environmental benefits of cold regeneration of emulsified asphalt, which has the advantages of increasing the service life of roads, bringing positive effects to the economy of related industries and regions, reducing the cost of materials and saving land resources. Avoid soil erosion and reduce asphalt pollution and other advantages. If considering the whole road life, emulsified asphalt cold recycling base can reduce the maintenance cost. Through the research in this paper, the emulsified asphalt cold recycled mixture has good road performance, and the pavement structure has good bearing capacity when it is applied to the base course or the lower layer. This technology is economical and environmental protection, and has broad development prospect in pavement maintenance engineering.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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