冷补沥青混合料设计研究

发布时间：2019-06-15 10:43

【摘要】：冷补沥青混合料是低温条件下对沥青混凝土路面坑槽病害的有效处理方式,具有不受环境因素影响、施工简便、通车快速、维护成本低、延长道路使用寿命、节能减排等优点。本文基于大量的室内试验、配合比设计,自主研制了一种新型冷补沥青混合料;并对该种冷补沥青混合料进行了一系列的性能评价,包括强度、存储性能、粘聚性、水稳定性、粘结性能等;最后对本论文设计的冷补沥青混合料的存储工艺、施工工艺及效益进行了讨论。主要得出以下结论:(1)冷补沥青混合料采用悬浮密实结构时,其抗水性较好、初始强度较高。选择此种结构设计冷补沥青混合料是应注意矿粉的用量,虽然矿粉的掺量越高,冷补沥青混合料的强度越大,但是为保证冷补沥青混合料的施工和易性,应控制其矿粉掺量在2%左右。(2)冷补沥青混合料的强度形成分为两个阶段:在施工阶段时,由于稀释剂挥发量较小,沥青结合料的粘结力较小,冷补沥青混合料的强度主要由矿料间的嵌挤作用提供,此时冷补沥青混合料的强度为初始强度;在使用阶段,随着稀释剂的大量挥发,沥青结合料的粘结力增大,在车辆荷载作用下,矿料间的内摩阻角φ值增加,冷补沥青混合料的强度逐渐增加至峰值并趋于稳定,此时的强度为成型强度。(3)基于沥青混合料拉伸强度定量测试、马歇尔试验等室内试验,综合考虑冷补沥青混合料的各项性能,最终确定冷补沥青液中改性剂及稀释剂的掺量:SEBS为5%、胶粉为4%、稀释剂为29%。(4)本论文对冷补沥青混合料的存储性、粘聚性、水稳定性、粘结性、初始强度及成型强度的评价提出了相应的试验方法。提出了在成型强度的试验中模拟冷补沥青混合料中稀释剂挥发过程的方法。(5)冷补沥青混合料的主要施工工序包括:坑槽开挖、清理坑槽、冷补料摊铺、压实、清扫。
[Abstract]:Cold filling asphalt mixture is an effective treatment method for pit disease of asphalt concrete pavement under low temperature. It has the advantages of simple construction, fast opening to traffic, low maintenance cost, prolonging road service life, saving energy and reducing emissions, and so on. In this paper, a new type of cold filled asphalt mixture is developed based on a large number of laboratory tests and mix proportion design, and a series of performance evaluation of this kind of cold mended asphalt mixture is carried out, including strength, storage performance, cohesion, water stability, bond performance and so on. Finally, the storage technology, construction technology and benefit of the cold mended asphalt mixture designed in this paper are discussed. The main conclusions are as follows: (1) when the suspension dense structure is adopted, the water resistance of the cold filled asphalt mixture is better and the initial strength is higher. In order to ensure the construction and ease of cold fill asphalt mixture, the content of cold fill asphalt mixture should be controlled at about 2%. (2) the strength of cold replenished asphalt mixture is divided into two stages: in the construction stage, because of the small volatile amount of diluent, the content of cold fill asphalt mixture should be controlled at about 2%. (2) the strength formation of cold fill asphalt mixture should be divided into two stages: in the construction stage, because of the small volatile amount of diluent, The adhesion of asphalt binder is small, and the strength of cold-filled asphalt mixture is mainly provided by the extrusion between minerals, and the strength of cold-filled asphalt mixture is the initial strength. In the use stage, with the volatilization of diluent, the adhesion of asphalt binder increases. Under the action of vehicle load, the internal friction angle 蠁 value between minerals increases, and the strength of cold-replenished asphalt mixture increases to the peak value and tends to be stable. (3) based on the quantitative test of tensile strength of asphalt mixture, Marshall test and other laboratory tests, the properties of cold-filled asphalt mixture are considered comprehensively. Finally, the content of modifier and diluent in cold fill asphalt solution is determined as follows: SEBS is 5%, rubber powder is 4%, diluent is 29%. (4) this paper puts forward the corresponding test methods for evaluating the storage, cohesion, water stability, adhesion, initial strength and molding strength of cold fill asphalt mixture. This paper puts forward a method to simulate the volatilization process of diluent in cold fill asphalt mixture in the test of molding strength. (5) the main construction procedures of cold fill asphalt mixture include pit excavation, cleaning pit, cold fill paving, compaction and cleaning.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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