Research On Design And Performance Of SBS Fiber Modified Asphalt Porous Mixture

The porous asphalt pavement is generally accepted all because of its bright characters, such as great pavement drainage ability with big interspace structure, great anti-sliding ability, nice security, positive noise reduction effect and nice high temperature resistance ability. The paper has studied the following questions, the technique standards of SBS fiber modified asphalt, mix design methods of PA mixture, saturated water ratio's effect on PA mixture's high temperature properties, fiber's mechanism and pavement performance of PA mixture.Firstly, the thesis adopts SBS and fiber two methods to modified asphalt. It has a total and systemic study on high temperature properties, low temperature properties, aging properties and law of development of SBS modified asphalt and SBS fiber modified asphalt. It puts forward the 60℃dynamic viscosity, SHAP rutting resistant factors, and 135℃brand viscosity as evaluation indexes of high temperature. And it brings forward 5℃ductility and breaking point as evaluation indexes of low temperature. And it also takes 5℃ductility and breaking point of aged-modified asphalt as evaluation indexes of after aging. Therefore it brings forward evaluation system on performance of asphalt modified by SBS and fiber. At the same time, it brings forward evaluation index and technic need of SBS modified asphalt.Secondly, It analyses rutting index of PA mixture on different test condition in different saturated water ratio. It opens out the law of performances of high temperature of SBS fiber modified asphalt affecting by asphalt, test temperature and grade. The research result shows that It is the worst condition as saturated water ratio is 60% to SBS fiber modified asphalt. It brings forward the rutting index and technic need of PA mixture on the worst condition.Thirdly, using the analysis method of discrete element theory, bringing up new design method of coarse aggregate gradation of PA mixture. Also it presents the grade range of PA mixture. Through in-depth research the relationship between asphalt index with optimal asphalt-stone ratio for PA mixture proposing to use 135℃Brandt viscosity of asphalt to determine the method for asphalt film thickness of PA mixture. Proposed the method of PA mixture mix design that based on discrete element theory and the viscosity index of 135℃Brandt.Finally, Analysis and study on road performance and evaluation index of SBS fiber modified asphalt comprehensively. It presents evaluation index and technic need of PA mixture of SBS modified asphalt. At the same time, the results showed that both modified by SBS and fiber, SBS fiber modified asphalt achieved high viscosity for modified asphalt mixture performance requirements, can serve as a high quality PA road binder.