The Research On Fatigue Performance Of Asphalt Mixture Coupling With Damage And Healing

Asphalt concrete will produce a certain amount of internal damage in the process of fatigue loading, such damage i would produce a certain degree of healing after unloaded, This healing effect makes the damage arising in the role of external factors its corresponding evolutionary regularlity change, which will also aff ect the fatigue life of asphalt concrete。In this paper,AC-13C asphalt mixture is selected to make bean specimens ,and then we carried ou a direct tensile test at different temperatures, won the tensile strength of the asphalt mixture at different temperatures。Through the fatigue test on MTS testing machine under different loading conditions, the changing regularities of asphalt concrete specimen are got。results show :Under the same conditions, the fatigue life of asphalt mixture with intermittent time time significantly longer than the fatigue life without intermittent time,when the intermittent time is less than 0.5s,the fatigue life grows as the intermittent time increases。When the intermittent reaches 0.5s ,the effect that the fatigue life grows as the intermittent time increases is no longer significantly i;with the stress rate loading on the asphalt mixture and the temperature increased, fatigue life decreases。After analysing and evaluating on several damage variables, we selected stiffness modulus in the process of fatigue to define the damage factor,analysed the fatigue damage in the fatigue process and its accumulated regularity。through analysis on the loading conditions such as different temperature,stress ratio and intermittent time ,we got the such as intermittent time fatigue damage under the parameters of function, considering the fatigue damage mode considering effects on the temperature, stress ratio and intermittentl time。The paper analyses some inadequacies in the work step on the basis of the above-mentioned works,and put forward some views and suggestions for the next works。狓?/>...