Research On Viscoelastic Properties Of Basalt Fiber Asphalt Mastic And Road Performance Of Its Mixture

When vigorously promoting the construction of ecologically long-life pavement,basalt fiber,as a green and environmentally friendly high-performance mineral fiber,has little difference in composition and aggregate,but only in different forms,and it has superior feasibility in combination with asphalt materials.The viscoelastic properties of asphalt mortar is one of the key factors that determine the performance of asphalt pavement,and it is of great significance to study the road performance of basalt fiber asphalt mortar and its mixture.The thesis compares the basic properties of four kinds of fibers and analyzes the superiority of basalt fibers.Through the orthogonal test,the high and low temperature performance indicators of basalt fiber asphalt mortar were tested,and the influence of three factors such as powder-to-binder ratio,fiber content,and fiber length on the rheological properties of basalt fiber asphalt mortar at high and low temperature was evaluated.The critical temperature T_HS,Viscosity-Temperature Index VTS,CAM model viscoelastic parameters,zero-shear viscosity ZSV,Burger model four parameters,simplified viscoelastic continuous medium damage（S-VECD）model based on LAS test and the basalt fiber asphalt mortar were evaluated Temperature and high-temperature rutting resistance,low-temperature creep capability and moderate-temperature fatigue performance,and through SEM microscopic experiments revealed the mechanism of action of basalt fiber on asphalt mortar.Based on the response surface method,the BBD design was used to optimize the basalt fiber asphalt mixture mix design.The effect of fiber content and length on the road performance of the basalt fiber asphalt mixture was studied.At the same time,the basalt fiber under the two optimized ratios was verified Road performance of asphalt mixture.Through the analysis of social and economic benefits,the social benefits and application value of basalt fiber asphalt mixture is expatiated systematically.