Study On Road Performance Of Fiber Permeable Asphalt Mixture

Pervious asphalt pavement has a very important position in the road engineering because of the significant benefits brought by the ecological environment and road safety.The research on the application of pervious asphalt pavement can help to promote its application.Pervious asphalt pavement can reduce the road traffic noise,alleviate the heat island effect caused by high temperature on the road surface;the rainwater generated by infiltration can be recycled again,not only to avoid the generation of urban road water in rainy season,but also to reduce the use of ecological water source in vegetation growth.Aiming at the performance of high viscosity modified asphalt required by permeable asphalt mixture and the influence of variable factors,based on the quadratic regression combination orthogonal design,three factors and two levels of orthogonal test were carried out to analyze the effect of SBS modifier,tackifier and antioxidant on the viscosity of high viscosity modified asphalt at 60? and 135?,and the relevant model was established.The order of influence on the viscosity at 60? was SBS in turn The order of influence of modifiers,antioxidants and tackifiers on viscosity at 135? was antioxidants,SBS modifiers and tackifiers.This paper focuses on the study of the influence of fiber on the performance of permeable asphalt mixture,calculates the rainfall intensity by using the rainfall intensity model analysis and selects the appropriate void ratio of the asphalt mixture,analyzes and determines the material index selected for the asphalt mixture,and determines the optimal asphalt consumption through the leakage test and the flying test on the basis of the traditional mix proportion design;and uses the relevant tests This paper analyzes the influence of fiber type,fiber content and fiber length on the performance of pervious asphalt mixture,in which fiber type and fiber content are the main factors affecting the water stability and high temperature stability of pervious asphalt mixture;fiber length and freeze-thaw times are the main factors affecting the low temperature performance of pervious asphalt mixture;the pervious asphalt mixture has a direct relationship with its porosity The influence of fiber type,fiber content and fiber length on the permeability is not direct.Based on the contact image of interface aggregate of asphalt mixture,the infiltration principle of rainwater in asphalt mixture is analyzed.The movement path and direction of water particle in the pores of asphalt mixture are all in curve shape.A two-dimensional model of particle movement is established to analyze the bending rate of particle movement.Three structural drainage methods of permeable asphalt pavement are determined,and corresponding drainage design scheme is put forward in combination with the three methods of drainage structure.