Study on Fatigue Properties of High-volume Rubber-modified Asphalt
The fatigue properties of high-volume asphalt rubber prepared by improved process were studied.The contents of three asphalt rubber were 30％,40％and 50％respectively.Three asphalt rubber and two control groups(SBS modified asphalt and 70JHJ base asphalt)were aged by RTFOT and PAV.The fatigue properties of five kinds of asphalt samples were studied by dynamic shear rhe-ometer(DSR)through temperature scanning,LAS test and time scanning test.The results show that the temperature scanning test cannot accurately distinguish the fatigue properties of modified asphalt.The fatigue damage of asphalt rubber with high content of RTFOT is not obvious in LAS test,and it is difficult to distinguish the fatigue performance.Therefore,it is suggested to use PAV aging sam-ples for the test.The test results obtained by time scanning are consistent.Under low or high stress level,the fatigue performance ranking is:AR40＞AR30＞AR50＞SBS＞70JHJ,which can effectively distinguish the fatigue performance of modified asphalt with different content.
rubber modified asphaltfatigue testlarge amount of rubber powderfatigue performance
万方数据
维普
