关键词: 道路工程, 加载顺序, 加载幅值, 沥青混合料, 劲度, 相位角

Abstract: Based on the strain-controlled four-point bending fatigue test of asphalt mixture，the effect of load sequence and load amplitude on the dynamic viscoelastic parameters of asphalt mixture was analyzed.The results show that：under the control of low-high load sequence，the stiffness will decrease but the phase angel will increase in two load levels with the increase of load times; under the control of high-low load sequence，there are two cases of the change of the stiffness and the phase angle in the low load stage.When the low load level is close to the high one，the stiffness will decrease but the phase angle will increase with the increase of load times in the low load stage.When the difference of the amplitude of the high and low load is large，the stiffness in the low load stage will increase first and then decrease，while the phase angle in the low load stage will decrease first and then increase.The viscous modulus and elastic modulus of the fatigue test were calculated respectively by phase angle.In the process of high-low load sequence，the phenomenon that the stiffness in the low load stage increases first and then decreases while the phase angle in the low load stage decreases first and then increases is revealed，which is caused by the elastic recovery in the asphalt mixture.

Key words: highway engineering, load sequence, load amplitude, asphalt mixture, stiffness, phase angle