Study On High Temperature Stability Of Asphalt Mixture Based On The Creep Test

The high temperature stability of asphalt pavement is the main performance of asphalt pavement,this paper uses creep test to evaluate the high temperature stability of asphalt mixture,and obtain creep parameters of asphalt mixture by creep test for Abaqus software to calculate the change temperature rut.Specific study content and results achieved are as follows:?1?Using Marshall method,four kinds of asphalt mixtures,GAC-13,GAC-20,GAC-25 and ATB-25,were designed;?2?Three axis static creep test and three axis repeated load creep test for the design of the mixed specimen are done under different temperature and pressure;?3?Comparative analysis method was used,at different temperatures and under loads of pressure,the use of dynamic stability?DS?,rut depth,flow frequency?Fn?,flow time?Ft?,creep,slope of the second stage(k_1?k₂)and a permanent axial strain the mixture high temperature stability evaluation,respectively.The results show that the flow number?Fn?,flow time?Ft?are not regular,put them as asphalt high temperature performance appraisal index is still worthy of discussion;the second phase creep slope(k_1?k₂)and axial strain regularity,but also in line with the actual performance of asphalt pavement,so they can be used as asphalt mixture high-temperature performance evaluation;?4?Depending on thermodynamic parameters of material and temperature boundary conditions,calculate the pavement structure temperature field.Through the anti-pressure test of GAC-13,GAC-20,GAC-25 and ATB-25 four different species asphalt mixed material,measured elastic parameters of asphalt mixture;through fitting the data of creep test to give the creep parameters of asphalt mixture,importe the pre-computed temperature field ODB file in the variable temperature rut computation,input elastic parameters and creep parameters,in each analysis step,firstly according to integration point temperature,the material parameter corresponds to temperature is calculated by interpolation,then iterative calculation of pavement structure the amount of rut,finally analysis the factors influenced permanent deformation of asphalt road,provides basis for prevention rut.