The Research of Asphalt Mixture Dynamic Modulus
|Course||Road and Railway Engineering|
|Keywords||Asphalt mixture Dynamic modulus Repeated loading method Percussion vibration method Ultrasonic Falling weight deflectometer instrument GRUBBS Plastic deformation Random load|
Actual stress state of the road surface and pavement design method , there is the difference between the model and parameters of dynamic and static , elastic and viscous , and pavement design system is an inevitable trend from static to dynamic . Therefore , the introduction of dynamic loads dynamic parameters and dynamic characteristics of the asphalt pavement structure is essential , therefore, the dynamic modulus of the asphalt mixture launched a study of the system . Firstly, both at home and abroad of indoor dynamic modulus test methods , including repeated loading method, percussion vibration method , ultrasonic method , from the physical and mechanical significance defined methods , test instruments and means to do a systematic comparative analysis . And repeated loading method as indoor dynamic modulus test method , this premise processing of the specimen , the determination of the test load and test other conditions parameters discourse and comparative study of the system , combined with the exploratory test data analysis , developed a data processing method of the test . Ultimately the formation of a system of dynamic modulus test methods . According to this method , the different types of asphalt mixes dynamic modulus test is conducted under different loading frequency , different load level bit different temperatures . Analyzes the influencing factors of dynamic modulus obtained relationship between static and dynamic modulus , comparative analysis and abroad, the same type of test , and the results show that the method is feasible , but also scientific and reasonable , but also further established test methods identified suitable condition. Finally, the development of the concept of dynamic modulus test instrument . Based on existing test data , combined with the MTS810 system specific targets, developed the functionality of the the development instrument modules, and each module has given key technical indicators of the instrument data acquisition system . Laid the foundation for the development of the instrument .