关键词: 道路工程;重度改性沥青;评价;高温

Abstract: In order to compare the difference between the conventional SBS modified asphalt and the creep recovery behavior of SBS modified asphalt,the multi-stress creep recovery test was used as the evaluation method of two kinds of modified asphalt to study the change of multi-stress creep recovery test parameter On the creep recovery behavior of high temperature.The rotary flask method was used instead of the conventional rotary film oven test(RTFO)to make the aging of the heavily modified asphalt aged more highly uniform.The results show that the unrecoverable creep compliance underestimates the strain response when using the MSCR test to assess the severe modified asphalt compared to the conventional SBS modified asphalt, resulting in overestimation of the traffic that can be applied for heavily modified asphalt level.In addition, the permanent strain of heavily modified asphalt has a strong loading time dependence, and the shorter loading time is more beneficial to reduce the effect of repeated creep recovery on the test results.It is recommended to use the loading of 0.1 s,the unloading combination of 0.9 s,and the Jnr value obtained by the 10th creep recovery cycle at 3.2 kPa as the final evaluation parameter..

Key words: road engineering;highly modified asphalt;evaluation;high temperature