Experimental Study And Stress Response Analysis Of TOR Asphalt Rubber Pavement

As a type of environmental and energy saving materials, asphalt rubber has two effects that it can not only improve the asphalt mixture’s performances, but also release the environmental problem brought by waste tire. Because of this, it becomes a hot issue to many research institutions. These years, a method that adds TOR coupling agent to asphalt mixtures in order to improve its performances is brought in. Several trial roads are paved in the early stage of research. As a new asphalt rubber materials, asphalt rubber mixture’s and pavement’s properties have been of a few differences from ordinary asphalt mixtures. However, the parameters that selected in the road structure design still refer to the ordinary design experience. The influences brought by different layers’ combinations haven’t been considered neither. These factors make the designed performances of asphalt rubber mixtures deviate from the actual performances.Therefore, the research on dedicate properties of TOR asphalt rubber mixtures need to be promoted, especially the performances influenced by the molding process. The influences generated by the alteration of TOR asphalt rubber mixtures’ performances are necessary to go deeper. In order to get a proper solution to these questions, this paper delivers experimental research and finite element analysis. Main contents are as follows.(1) Study the proper preparing process of TOR asphalt rubber, determine the appropriate rubber content, mixing temperature, stirring rate and mixing time. It is concerned that the rubber content has great influences on asphalt rubber’s performances.(2) Prepare specimen respectively by dry process and wet process, test the expansion ratio of TOR asphalt rubber applied mixture. Determine the proper grading of mixture that suits the TOR asphalt rubber, which indicates to SMA13and SUP13.(3) Use the wheel tracking test, bend test, marshall immersion test and so on, to study the stability under high temperature, anti-cracking property under low temperature and water-resistance property of the SMA13and SUP13which TOR asphalt rubber is applied. Both dry process and wet process are considered. (4) Discuss the disadvantages in current asphalt pavement design, test the compression rebound modulus of TOR asphalt rubber applied mixture. Use the asphalt pavement design software to design road structures.(5) A finite element analysis software is applied to analyze the stress response in the road structure. The conclusion is compared to the HPDS computing conclusion, in order to get a more reasonable conclusion.The conclusion drawn in this paper offer a reference to design of asphalt road and the appliance and extension of TOR asphalt rubber, broaden the finite element analysis software’s appliance in road structure analysis. It is of certain importance, creativity and has certain appliance value.