冷補(bǔ)瀝青混合料設(shè)計(jì)研究
[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.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:U414
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