Asphalt And Asphalt Mixture At Low Temperature Performance Evaluation Methods Of Research

At present,with the development of transportation,still exist many unsolved problems of asphalt pavement,including low temperature cracking is one of the problems of pavement damage.Aimed at the low temperature cracking asphalt surface,pavement crack design and materials and low temperature performance has always been an important content of international academia,and put forward a lot of evaluation index of low temperature performance of asphalt pavement.But how to use low temperature index of the material and road performance,you need to do further research.In this paper,based on the research of the low temperature cracking of asphalt pavement evaluation method,the low temperature evaluation index of asphalt and asphalt mixture and road performance,in order to better evaluate the low temperature performance of asphalt mixture,asphalt and asphalt mixture at low temperature performance evaluation methods of correlation,this paper mainly through the indoor experiment study of asphalt and asphalt mixture for reference to the rationality of the evaluation method in low temperature.First of all,this article uses four kinds of asphalt(70 #,90 # asphalt,SBS modified asphalt and rubber modified asphalt)study of asphalt temperature evaluation method,according to the penetration of the grading system in our country,as well as the SHRP PG grading system of representation methods to evaluate the performance of asphalt at low temperature,including low temperature ductility and brittle point and bending beam rheological test(BBR)was studied,and Burgers was not based on the model,using the nonlinear fitting of viscoelastic parameter to analyze the influence of temperature on the viscoelastic parameters,get comprehensive compliance parameters to evaluate the performance of asphalt at low temperature.Based on the latest equipment APTTS shandong expressway group constraint thermal stress restrained sample tests,is the world recognized the best evaluation method for the low temperature performance of asphalt mixture.Choose AC – 13?SMA-13 representative of asphalt mixture and SMA mixture ratio design,to our country's construction of asphalt mixture in the evaluation method of low temperature bending test at low temperature and low temperature of the test procedures of splitting test,this paper compares and analyzes the test evaluation research to prepare for the next chapter.Last chapter in order to obtain reasonable asphalt and asphalt mixture at low temperature performance evaluation methods and indicators,using grey relational analysis,calculate the evaluation index of asphalt and asphalt mixture at low temperature and constraint temperature stress test specimens of frozen temperature correlation between the size and the order of study on the correlation of analysis,in order to determine reasonable asphalt and asphalt mixture at low temperature performance evaluation method and index to provide the reference.