Laboratory Evaluation Of Fiber Drainage Asphalt Mixtures

With the rapid development of highway construction and continuous improvement of living standards, Demand of People on the highway quality is higher and higher, security, comfort, environmental protection and durability attract more attention. The porosity of drainage pavement is generally 15% to 25%, with the rain sliding performance, reducing the water mist, decreasing car noise, high temperature stability and other significant advantages, which get wide range of application at home and abroad. But that the high viscosity modified asphalt(modified bitumen such as TPS) is used and high cost seriously constraints its promotion and application.Based on the analysis of basis characteristics of drainage asphalt pavement, with the propose of reducing the construction cost, using the ordinary SBS modified asphal t was modified by adding four different fibers, drawing high-viscosity modified asphal t mixture gradation range and design method, the optimum asphalt content is ascertain ed by analysis of leak test and flying test which can ascertained the maximum amoun t of asphalt (OACmax) and the minimum asphalt content (OACmin). Road performance and factors of fiber drainage mixs were tested. Road drainage and cost-effective with TPS pavement is compared, the results show that the fiber drainage pavement is feasi ble in application.The study shows that particle fibre drainage asphalt mixture is the best in four fi bers mixtures. Which largely meets the performance requirements of drainage asphalt pavement and engineering economy is better than TPS drainage mixture. The fiber dra inage asphalt pavement is fit for little traffic, especially for under developed rainy mo untain areas.