Rutting Performance of Gap Graded Asphalt Rubber Mixtures

Abstract:

A series of tests such as rutting test, repeated load test, dynamic modulus test and field test, was made to investigate the rutting performance of gap graded asphalt rubber mixtures ARAC13 by comparing with the modified asphalt mixture SMA13. The laboratory test results show that ARAC13 has bigger consolidated strain and smaller dynamic modulus at the consolidation stage of rutting process, and subsequently the rutting resistance and dynamic modulus of ARAC13 increased. 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 obtained unless repeated load test is made. A Four year project application results show that the slope of 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.