早强型乳化沥青冷再生混合料配合比设计及性能研究

发布时间：2018-10-24 17:19

【摘要】：冷再生技术是指常温下使用专用再生机械，完成面层和部分基层在内的旧路面结构层铣刨和破碎，然后添加再生材料，经过拌和、摊铺、碾压等作业过程．重新形成具有一定承载能力的结构层的一种工艺。然而，目前世界上还没有被普遍认同的冷再生设计方法，，各个国家采用的材料与科研设备不一样，导致实验结果也有所区别，我国与其它发达国家相比，沥青路面的冷再生还处于摸索阶段，存在旧料利用率低，早期强度发展缓慢，需要长时间阻断交通等技术难题，基于此本文针对早强型乳化沥青冷再生混合料性能进行深入的研究。本文分析了常见路面破坏形式，并对试验所用沥青面层旧料进行了技术性质分析，评价了RAP的级配组成和回收沥青的老化程度；分析了乳化沥青与RAP的作用机理以及乳化沥青冷再生混合料的强度形成原理与影响因素。通过实验，采用水泥和乳化沥青为再生剂进行了水泥乳化沥青冷再生混合料的配合比设计，确定新旧料的比例为2:8的混合料合成级配，最佳含水率采用6.5%。采用路用性能验证最佳水泥含量和最佳乳化沥青用量，在兼顾高温抗车辙和水稳定性的同时，确定当乳化沥青含量为6%，早强水泥用量为2%，早强型冷再生材料的力学性能和路用性能均最优。参考国际上已有冷再生路面结构设计方法，结合依托工程实际情况，构建了一套较完整的冷再生沥青路面结构设计方法，考虑到冷再生路面上面层最小厚度，提出了将铣刨后的路面视为下承层，与加铺的再生层、上面层等三层共同构成三层弹性体系力学模型，并将再生层作为设计层，按照沥青改建路面的设计方法进行结构设计。最后介绍了冷再生技术的施工工艺、质量控制及其经济效益和社会效益。
[Abstract]:Cold regeneration technology refers to the use of special regenerative machinery at room temperature to finish milling and crushing the old pavement structure layer, including the surface layer and part of the base course, and then add recycled materials, after mixing and spreading, Rolling, etc. A process for reforming a structural layer with a certain bearing capacity. However, there is no universally accepted cold regeneration design method in the world at present. The materials used in different countries are different from the scientific research equipment, which leads to different experimental results. Compared with other developed countries, China is different from other developed countries. The cold regeneration of asphalt pavement is still in the exploratory stage, there are some technical problems, such as low utilization ratio of used materials, slow development of early strength, and the need to block traffic for a long time. Based on this, the performance of early-strength emulsified asphalt cold-recycled mixture is studied. In this paper, the common pavement failure forms are analyzed, and the technical properties of the asphalt surface used in the test are analyzed, and the gradation composition of RAP and the aging degree of recovered asphalt are evaluated. The action mechanism of emulsified asphalt and RAP and the forming principle and influencing factors of the strength of cold recycled mixture of emulsified asphalt are analyzed. Through experiments, the mixture ratio of cold recycled mixture of cement emulsified asphalt and emulsified asphalt was designed by using cement and emulsified asphalt as regenerative agent. The composite gradation of mixture with the ratio of new and old materials was determined to be 2:8, and the optimum moisture content was 6.5%. The optimum cement content and the optimum emulsified asphalt content are verified by road performance, and both high temperature rutting resistance and water stability are taken into account. When the content of emulsified asphalt is 6 and the content of early strength cement is 2, the mechanical properties and road performance of cold regenerated materials of early strength type are optimized. Referring to the existing design methods of cold recycled pavement structure in the world, a complete design method of cold recycled asphalt pavement structure is constructed, considering the minimum thickness of the upper surface of cold recycled pavement, which is based on the actual situation of the project. It is proposed that the pavement after milling and planing is regarded as the lower bearing layer, and the three layers, such as the additional regenerative layer and the upper layer, are combined to form a three-layer elastic system mechanics model, and the regenerated layer is taken as the design layer, and the structure is designed according to the design method of asphalt reconstruction pavement. Finally, the construction technology, quality control and economic and social benefits of cold regeneration technology are introduced.
【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】：U414

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