再生沥青混合料的设计及路用性能试验研究

发布时间：2018-06-22 21:54

本文选题：沥青混合料 + 再生剂　；参考：《重庆交通大学》2015年硕士论文

【摘要】：随着我国工业技术的发展,以及人们生活水平的提高,汽车拥有量陆续增加。这必将导致交通量和路面荷载的不断增长,加之各种恶劣自然环境的影响,必然会导致沥青路面老化程度的加深和老化速度的加快,最终使得沥青路面会产生一些裂缝、坑洞等各种病害现象,对道路的路用性能产生严重的负面影响,严重影响路面行驶安全。我国早期修建的大量公路相继进入了大修、改建、扩建阶段。在此过程中必将产生大量的废旧沥青混合料,若不加以好好利用将造成资源浪费和环境污染。而应运而生的再生沥青混合料技术能够很好的解决这些问题,实现降低工程成本、节约大量砂石材料,可以产生巨大的经济效益和社会效益,同时符合低碳环保和可持续发展的要求,应当在我国进行大力推广应用。本文在国内外废旧沥青路面再生技术研究的基础上,依托郑州东四环公路改造项目,对公路进行现场取样。通过对取样的旧沥青混合料进行室内试验分析,测定沥青含量和三大指标以及组分分析,得出旧沥青混合料的沥青已经严重老化以及集料出现了细化不再满足技术规范要求;在此基础上进一步分析旧沥青的老化过程和再生机理,通过分析确定了选择厂办热再生方式和再生剂最佳掺量;然后进行再生沥青混混合料配合比设计,分别在不同旧料掺量下设计出合理的集料级配和最佳油石比;为验证混合料再生效果和判断出最佳的旧料掺配率,通过一系列室内试验分析再生沥青混合料的力学性能、高温性能、低温性能、水稳性能以及耐老化性能,分析得出再生沥青混合料的各路用性能与普通沥青混合料的路用性能差别并不大,其中力学性能和高温性能甚至还由于普通沥青混合料,只是低温性能、水稳性能和耐老化性能略低于普通沥青混合料;最后通过综合分析得出,再生沥青混合料的各性能都与旧料掺配率和集料级配有密切关系,通过合理的级配设计和30%的旧料掺配率拌合的再生沥青混合料各性能虽有所降低但都能满足路面规范要求;可见,在今后道路维修改造工程中特别是在砂石材料贫乏的地区利用旧沥青混合料再生技术,将有其重要的意义。
[Abstract]:With the development of industrial technology and the improvement of people's living standard in China, the number of cars is increasing one after another. This will inevitably lead to the continuous increase of traffic volume and pavement load, together with the impact of various adverse natural environment, will inevitably lead to the deepening of the aging degree of asphalt pavement and the acceleration of aging speed, which will eventually lead to some cracks on the asphalt pavement. Various diseases, such as potholes, have a serious negative impact on road performance and seriously affect road safety. China's early construction of a large number of highways have entered the major repair, reconstruction, expansion phase. In this process, a large number of waste asphalt mixture will be produced, if it is not properly utilized, it will cause waste of resources and environmental pollution. The technology of recycled asphalt mixture can solve these problems well, reduce the engineering cost, save a lot of sand and stone materials, and produce great economic and social benefits. In line with the requirements of low carbon environmental protection and sustainable development, it should be popularized and applied in China. Based on the research of recycling technology of waste asphalt pavement at home and abroad, based on the project of Zhengzhou East fourth Ring Road, this paper carries out site sampling of highway. Through the laboratory test and analysis of the old asphalt mixture, the asphalt content, the three indexes and the component analysis are determined. It is concluded that the asphalt of the old asphalt mixture has been seriously aged and the aggregate has been refined to no longer meet the requirements of the technical specifications. On this basis, the aging process and regeneration mechanism of old asphalt are further analyzed, through which the selection of heat regeneration method and the optimum amount of regenerative agent are determined, and then the mix ratio design of recycled asphalt mixture is carried out. In order to verify the effect of mixture regeneration and determine the best blending ratio of used materials, the mechanical properties of recycled asphalt mixture were analyzed through a series of laboratory tests. The properties of high temperature, low temperature, water stability and aging resistance are analyzed. It is concluded that the road performance of recycled asphalt mixture is not different from that of ordinary asphalt mixture. Among them, mechanical and high temperature properties are even due to ordinary asphalt mixture, which are only low temperature performance, water stability and aging resistance are slightly lower than those of ordinary asphalt mixture. Finally, through comprehensive analysis, it is concluded that, Each performance of recycled asphalt mixture is closely related to the admixture ratio of used materials and aggregate grade. The performance of recycled asphalt mixture which is mixed with reasonable gradation design and 30% blending ratio of old materials can meet the requirements of pavement specifications although it is reduced. It can be seen that it will be of great significance to use the old asphalt mixture recycling technology in the road maintenance and reconstruction project in the future, especially in the areas with poor sand and gravel materials.
【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

【参考文献】