Viscoelasticitic Analysis And Parameter Ascertaining On Asphalt Mixture With Glass Fiber

With the traffic flux growing rapidly, the high grade asphalt pavement is to be used for more and more in the road construction. On the otherwise, its shortage is also becoming more obvious, especially for the earlier asphalt pavement damage. It affects the transportation and brings huge economy burden to the later maintain.Current designs of our country are all according to the elastic theory mechanical. But the actual material property that asphalt pavement is a kind of viscoelasticity material, whose basic characteristic should be given full consideration in the analysis of road surface in order to reflect the actual situation. At the same time, the quality that passes to improve the bituminous concrete also can alleviate the increasingly serious earlier asphalt pavement damage condition. This paper uses fiber glass adding to the asphalt concrete to improve its capability on the road using. Through carrying on the experiment to the glass fiber we can get its parameter of viscoelasticity material. Taking fiber glass strengthened bituminous concrete for asphalt pavement structure, it bases on viscoelasticity theory to analysis the structure. This text is divided into five totally.Chapter 1 is the introduction of the thesis, introduce the development history of the layer form system theories, and a detailed domestic and abroad research of the parameter confirmation current development introduce the fiber material application history in pavement construction , and a domestic research of the fiber-strengthened bituminous concrete experiment ,provide a direction of research and main content.Chapter 2 is mainly an introduction of the basic theories in viscoelastic structure analysis. Give a description of the variation of stress of bituminous concrete in loaded condition. The property of viscoelastic material is dependenced on temperature and time, which should be given full consideration. According to dimensions that the material changes and time is consistent with the same mechanics phenomenon. Therefore we can only carry on the research to the material considered time factor. Using Laplace transformation and correspondence principle, we can make the problem easy. It also intrudes some of the viscoelastic structures.Chapter 3 is mainly about the experiment of the fiber-strengthened concrete in various temperatures and stress .Through creeping on different stress and temperature, we can get its viscoelasticity parameter. The parameter generated is put into the creep model of Burgers analyzing each influence to experiment condition to asphalt bituminous concrete. Taking a value to evaluation the condition of experiment, the fiber glass made the bituminous concrete to reduce the sensitive degree of the temperature, and improved the heat stability of the bituminous concrete effectively. The data got from experiment are put in to formulas, the result thus got is of great significance in solving the problem of traffic and overloading in our country.Chapter 4 is about the application of the fiber glass strengthened bituminous concrete as the surface material of the asphalt pavement using the formula made in this essay based on the theories viscoelastic system to evaluate its performance. This chapter gives a detailed introduction of the theories based on which the viscoelastic procedure was made. Through the touching the condition and the surface boundary condition we get each structure layer undetermined coefficient. The pavement material is considered as viscoelastic. It calculates the vertical stress, radial stress, shear stress and vertical displacement.Chapter 5 is conclusion part. It gives a summary of the work done in this essay and provides suggestions to the possible work which would be needed afterwards.