Preparation And Performance Evaluation Of High Viscosity Modified Asphalt

With the development of permeable roads and sponge cities,and changes in people’s demand for road traffic,Ordinary asphalt materials can no longer meet the requirements of traffic comfort,safety and environmental protection,especially when ordinary asphalt mixture are used on permeable pavement,the strength and durability of the pavement is difficult to meet the requirements of the specification.The research of high-viscosity modified asphalt has important practical significance for the popularization and application of permeable pavement,The paper comprehensively analyzes the research status of high viscosity modified asphalt,the basic experiments,multi-stress repeated creep tests and aging tests were used to systematically study the prepared two high-viscosity modified asphalt binders.Through comparative analysis with SBS and TPS,the performance and mechanism of high-viscosity modified asphalt are revealed,and the main performance of high-viscosity modified asphalt mixture is studied in depth to judge the feasibility of its road performance.With the help of basic experiments,the admixture and the content of the high-viscosity modified asphalt were determined through comparison and selection,and two types of highviscosity modified asphalt were prepared.Through parallel experiments,the rutting factor,zero shear viscosity,and non-recoverable creep Indexes such as flexibility,creep rate and creep stiffness were used to analyze and evaluate the high-temperature performance,lowtemperature performance and durability of the high-viscosity modified asphalt binder.Based on the Carreau and Burgers models,the results of the frequency sweep test and the BBR test were fitted and analyzed respectively.The Carreau model and the Cross model were compared,and the results of the Carreau model fitting were closer to the actual zero shear viscosity value.By comparing and analyzing two self-made high-viscosity modified asphalts through aging test,it is concluded that the anti-aging agent used in this paper can improve the anti-aging properties of asphalt materials.The self-made two modified asphalt mixtures were evaluated by rutting test,low temperature trabecular test,submerged Marshall test and four-point bending fatigue test.Through the evaluation results,it can be concluded that the two modified asphalts made in this paper have good high and low temperature performance and durability,and can meet the relevant specifications of my country’s high viscosity modified asphalts at this stage.Through research and analysis,find environmentally friendly and economical modified materials that can ensure high and low temperature performance and have good anti-aging properties,and determine the composition,dosage and reasonable preparation process of highviscosity asphalt.The performance of bituminous asphalt was evaluated one by one,which provided a reference for the research of high-viscosity modified asphalt,and also provided a basis for the development and application of OGFC pavement and anti-rut aspects of asphalt pavement.