间断级配橡胶沥青混合料抗车辙性能

采用我国现行车辙试验、重复加载蠕变试验、动态模量试验等室内试验和工程验证,通过对比间断级配橡胶沥青混合料ARAC13与苯乙烯丁二烯苯乙烯嵌段共聚物改性沥青(SBS改性沥青)混合料SMA13的性能指标,研究ARAC13的抗车辙性能.室内试验结果表明,在初期压密阶段,ARAC13压缩变形大、模量低;初期压密以后,ARAC13模量增大,抗车辙能力增强.我国现行车辙试验不能模拟围压作用下沥青混合料的压密过程,不能反映ARAC13混合料抗车辙性能在压密前后的变化;重复加载蠕变试验可以反映其性能变化.4年的工程应用表明,重复加载蠕变试验2 000次后的应变次数曲线斜率可以用于评价ARAC13的抗车辙性能,ARAC13的抗车辙性能优于对比的SMA13.

Rutting Performance of Gap Graded Asphalt Rubber Mixtures

A series of tests such as rutting test, repeated load test, dynamic modulus test and field test, were made to investigate the rutting performance of gap graded asphalt rubber mixtures ARAC13 in comparison with the modified asphalt mixture SMA13. The laboratory test results show that ARAC13 has bigger consolidated strain and smaller dynamic modulus on the consolidation stage of rutting process, subsequently, the rutting resistance and dynamic modulus of ARAC13 increase. At present, rutting tests in China cannot realize the simulation of the compaction process of asphalt mixture under confining stress, therefore, the change of the rutting performance of ARAC13 cannot be obtained unless the repeated load test is made. A four year project application results show that the slope of the repeated load test for 2000 cycles can be used to evaluate the rutting performance of ARAC13, and the rutting performance of ARAC13 is superior to that of the control mixture SMA13.