【摘要】：冷再生技術是指常溫下使用專用再生機械，完成面層和部分基層在內的舊路面結構層銑刨和破碎，然后添加再生材料，經過拌和、攤鋪、碾壓等作業(yè)過程．重新形成具有一定承載能力的結構層的一種工藝。然而，目前世界上還沒有被普遍認同的冷再生設計方法，，各個國家采用的材料與科研設備不一樣，導致實驗結果也有所區(qū)別，我國與其它發(fā)達國家相比，瀝青路面的冷再生還處于摸索階段，存在舊料利用率低，早期強度發(fā)展緩慢，需要長時間阻斷交通等技術難題，基于此本文針對早強型乳化瀝青冷再生混合料性能進行深入的研究。 本文分析了常見路面破壞形式，并對試驗所用瀝青面層舊料進行了技術性質分析，評價了RAP的級配組成和回收瀝青的老化程度；分析了乳化瀝青與RAP的作用機理以及乳化瀝青冷再生混合料的強度形成原理與影響因素。 通過實驗，采用水泥和乳化瀝青為再生劑進行了水泥乳化瀝青冷再生混合料的配合比設計，確定新舊料的比例為2:8的混合料合成級配，最佳含水率采用6.5%。采用路用性能驗證最佳水泥含量和最佳乳化瀝青用量，在兼顧高溫抗車轍和水穩(wěn)定性的同時，確定當乳化瀝青含量為6%，早強水泥用量為2%，早強型冷再生材料的力學性能和路用性能均最優(yōu)。 參考國際上已有冷再生路面結構設計方法，結合依托工程實際情況，構建了一套較完整的冷再生瀝青路面結構設計方法，考慮到冷再生路面上面層最小厚度，提出了將銑刨后的路面視為下承層，與加鋪的再生層、上面層等三層共同構成三層彈性體系力學模型，并將再生層作為設計層，按照瀝青改建路面的設計方法進行結構設計。最后介紹了冷再生技術的施工工藝、質量控制及其經濟效益和社會效益。
[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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U414

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本文編號：2292037