Research On Quantification Evaluation Model Of Asphalt Mixture Durability Based On Cantabro Test

In recent years,with the deepening of the concept of sustainable development,the construction of ecological and environmentally friendly roads has also been greatly developed.Open-graded asphalt wear layer(OGFC),as a typical green ecological pavement,has good drainage and noise reduction performance,and is widely used in various roads.However,due to the large number of pore structures in the OGFC pavement,while having good ecological functions,its material structure strength is insufficient,and the durability is poor.The problems are also very prominent.Therefore,after the design of the mix ratio,the design asphalt dosage should be tested to determine the minimum The amount of asphalt ensures the anti-loosening performance of the pavement.However,the current scattering test method is essentially a qualitative evaluation based on experience.By comparing with the experience value,it is analyzed whether the mixture is "qualified",but it is impossible to accurately judge whether the material is "appropriate" for the application of different grades of roads.Based on this,constructing a set of indicators for precise and quantitative design of OGFC pavement,and linking the flying test with the "mechanics-experience" design method adopted by the current asphalt pavement is the focus of current ecological road research.This study is based on the Kentucky Fort Scattering Test.It analyzes the mixture specimens prepared with different gradations and raw materials,discusses the effectiveness of traditional quality loss indicators,and further analyzes the changes in the damage area caused by the falling particles during the scattering process.At the same time,using the pendulum energy test to measure the energy required for a unit area fracture failure of the asphalt mortar,combined with the calculation results of the above failure area,the fracture energy change during the scattering process is obtained.In order to link the evaluation index of the flying test with the "mechanics-empirical" method,this research conducted rheological tests on different specimens,calculated the relationship model between fracture energy and dissipated energy;and used finite element simulation technology to study the load effect and energy The relationship between dissipation:Combining the research results of the previous flying test,establish a quantitative relationship model between the number of axle loads and the flying test.The study found that there is a good correlation between the fracture energy and the number of flying circles,and the relationship model between the fracture energy and the number of flying circles was established;the dissipation energy of the fatigue failure of the specimen was tested by a shear rheometer,and it was compared with the fracture energy.Fitting conversion to obtain the change of dissipated energy during the flying test;finally,with the help of finite element simulation,study the change of road dissipated energy under load,establish a quantitative model between the load effect and the number of flying cycles,and obtain different load effects Next,the conversion relationship between the number of axle load actions and the number of flying turns realizes the quantitative evaluation of durability based on the flying test.This study uses energy analysis to establish a quantitative model between the flying test and the number of load actions,and achieves the purpose of accurately evaluating the durability of the asphalt mixture based on the flying test.At the same time,the design and performance evaluation of the asphalt mixture at this stage also need to rely on Phenomenological experiments are not compatible with the progress of pavement design methods based on "mechanics-experience".In view of this,this research hopes to gradually realize the progress of pavement material design through the exploration of "from phenomenon to essence".