沥青路面旧料热再生应用技术研究

发布时间：2018-03-10 00:34

本文选题：道路工程　切入点：热再生　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国高速公路建设事业的不断发展，早期修建的高速公路相继进入维修、改扩建阶段。沥青路面再生是解决旧路铣刨后产生的材料浪费和环境污染等问题的主要技术手段。本文从沥青老化再生机理入手，进行了再生沥青融合试验方法的初步探索，在已有研究基础上，结合工程实践，通过沥青路面回收料（RAP）性状评价、矿料的级配分析，得知旧料的级配不满足现行规范的要求；通过对旧料进行抽提试验发现，回收的沥青性能衰减严重。检测储存旧料的含水量发现，RAP旧料的含水量每天都在变化。利用马歇尔设计方法，通过最佳沥青用量的确定、配合比设计与检验等步骤，对厂拌热再生沥青混合料进行配合比设计。研究发现再生沥青的针入度指数随着新沥青掺量的增加而增大；再生沥青混合料随着旧料掺配率的增大，新沥青的需求减小；随着旧料RAP提高，其拌合温度范围和施工温度均有不同程度的提高，对应的最佳拌合温度和最佳施工温度也有所提升。为了验证再生沥青混合料在高等级公路的可行性，本文进行了AC-25级配多个旧料掺量下的路用性能试验。进行了车辙试验、浸水马歇尔、冻融劈裂试验、疲劳试验、弯曲试验。结果表明，随着旧料掺量增加，再生沥青混合料的高温性能有所改善；再生沥青混合料水稳性和疲劳性能随RAP用量增大时均呈现降低趋势，旧料的过多加入，，会导致水稳定性和疲劳性能降低；而再生沥青混合料的低温性能与RAP的用量增多变化不大。在上述研究的基础上，本文又对再生沥青混合料的施工工艺和施工控制进行了论述，对施工过程中需要注意的事项进行了分析。同时对经济效益和社会效益进行计算和评价。
[Abstract]:With the continuous development of highway construction in China, the early built expressway has entered the stage of maintenance, reconstruction and extension. Asphalt pavement regeneration is the main technical means to solve the problems of material waste and environmental pollution caused by the old road milling and planing. Based on the mechanism of asphalt aging and regeneration, this paper makes a preliminary exploration of the fusion test method of recycled asphalt. On the basis of existing research and engineering practice, through the evaluation of asphalt pavement recycled material (rap), the gradation analysis of mineral aggregate is carried out. It is known that the gradation of used materials does not meet the requirements of the current code, and through the extraction test of used materials, it is found that, The performance of recycled asphalt attenuates seriously. The moisture content of rap is changing every day by measuring the moisture content of used materials. By using Marshall design method, through the determination of optimum asphalt content, the mix ratio design and test, etc. The research shows that the penetration index of recycled asphalt increases with the increase of new asphalt content, and the demand of new asphalt decreases with the increase of mix ratio of recycled asphalt mixture. With the increase of RAP, the range of mixing temperature and construction temperature are increased to some extent, and the corresponding optimum mixing temperature and construction temperature are also improved. In order to verify the feasibility of recycled asphalt mixture in high grade highway, the road performance test of AC-25 gradation with multiple used materials was carried out. Rutting test, immersion Marshall test, freeze-thaw splitting test, fatigue test were carried out. The results of bending test show that the high temperature performance of recycled asphalt mixture is improved with the increase of the amount of used materials, and the water stability and fatigue performance of recycled asphalt mixture decrease with the increase of RAP content. The low temperature performance of recycled asphalt mixture and the increase of RAP content do not change much. On the basis of the above research, this paper also discusses the construction technology and construction control of recycled asphalt mixture, analyzes the matters needing attention in the construction process, and calculates and evaluates the economic and social benefits.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.26

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