Combined Effect of Loading Pattern, Pulse Duration, and Stress Level on the Cyclic Creep Test of Asphalt Mixture

Abstract

AbstractIn this research work, based on the permanent strain mechanisms, the behavior of asphalt mixture under different loading conditions was examined in a cyclic compression creep test. This research study was conducted with three loading patterns at three pulse durations and stress levels. The results show the following: (1) the permanent strain mechanisms are strongly affected by stress level, pulse duration, loading patterns, and their interactions; (2) the rate of change in permanent strain from stress at a low stress level is significantly higher than that at a high stress level; (3) asphalt specimens with higher initial strain will show a lower rate of rutting progression as the number of load applications increases; (4) at a pulse duration corresponding to low speed, the asphalt specimen shows permanent strain over a shorter period of time, but at high speed this condition is dependent on stress level; (5) cumulative permanent strain is not linearly proportional to stress level for all loading c...