Numerical Analysis And Experimental Research Of High Temperature Fields In Asphalt Pavement

It has been concluded that the temperature profiles in asphalt pavement have a great effect upon the bearing capacity and performance of pavement structure by a number of engineering experiences. If it is possible to predict exactly the temperature profiles in asphalt pavement based on solar radiation and air temperature and so on, the pavement structure design methods will be greatly improved and it will become the reality that using different grade binders in different layers as a more economical method compared with the traditional.In order to solve such problems, based on the primary theories in thermology, the two dimensional transient temperature fields are analyzed in detail and the energy balance equation with explicit scheme in pavement is deduced firstly. Then the finite difference method is employed to predict the thermal regime in asphalt pavement structures with a specific program. After itemizing the flaws in existing pavement temperature prediction theoretical methods, the boundary condition and the thermal parameters are confirmed. Then the experimental research is carried out in Linxiang-Changsha Freeway, which is part of Western transportation construction technological project of the Ministry of Communications, "Researches on Control Parameters of Roadbed and Pavement". A great number of in-site measure data is available from that. Based on that, the validation of the numerical method in this thesis is conformed using three series of climates and in-site measure data from different area. On the basis of the sensitivity analysis about every input parameters and hypothesis in calculation model, some important conclusions are drawn out. Finally, the Genetic Algorithms are employed to back-analyze the temperature regime in asphalt pavement, which can greatly improve the computational accuracy and validation of this numerical model.