The Fatigue Performance Of Asphalt Mixture Of Full-scale Track Based On Dynamic Mechanical Analysis(DMA) Method

In this study,five different kinds of asphalt mixture which was used in RIOHTrack was selected to do the fatigue test under different conditions by dynamic mechanical analysis.Through the annalysis of the experimental results,the fatigue performance of mixtures was evaluate,and the new method of estimating the fatigue performance was provided.Firstly,the fatigue test results were processed using Weibull function distribution model to obtain the fatigue life of asphalt mixture with 50% guarantee rate under different test conditions.The variance analysis method was used to explore the influence of asphalt type,frequency,temperature and strain level on the fatigue performance of asphalt mixture.Then,the exponential function fatigue model of asphalt mixture was obtained by statistical regression,and the influence of frequency on the fatigue limit of asphalt mixture was explored.the fatigue equation for asphalt mixture based on different influence factors were established.Finally,the asphalt mixture fatigue test method based on DMA method was verified by two-point bending fatigue test method.The result show that(1)The fatigue test results of asphalt mixture based on DMA method are stable,and the test results are highly correlated with the two-point bending fatigue test results.Therefore,this method can reasonably and accurately evaluate the fatigue performance of asphalt mixture.(2)Asphalt type,temperature,strain and frequency have a significant effect on the fatigue performance of the asphalt mixture.The higher the temperature,the better the fatigue performance of the material;the higher the strain level,the worse the fatigue performance of the material;and the fatigue performance of the asphalt mixture will be lower as the frequency increases.(3)The fatigue equation of asphalt mixture based on different influencing factors is established by means of statistical regression method...