Analysis of viscoelastic response and creep deformation mechanism of asphalt mixture
Analysis of viscoelastic response and creep deformation mechanism of asphalt mixture
复制标题
沥青混合料粘弹性响应及蠕变变形机理分析
DOI：
10.1016/j.conbuildmat.2018.03.104
复制
发表时间：
2018-05-20
影响因子：
7.4
通讯作者：
Dong, Hao
中科院分区：
文献类型：
--
作者：
Li, Peilong;Jiang, Xiuming;Dong, Hao
沥青混合料是一种典型的粘弹性材料。其力学响应和变形行为取决于作用时间、温度条件和应力水平。采用AC-13、AC-16、AC-20三种沥青混合料进行了不同温度条件和应力水平下的静态蠕变试验。根据蠕变曲线，得到了该材料的Burgers粘弹性参数E-1、eta（1）、E-2、eta（2）和稳态蠕变速率K。分析了试验温度、应力水平和集料级配对沥青混合料粘弹性参数的影响。基于沥青混合料稳态蠕变速率与试验温度和荷载应力的关系，提出了沥青混合料的应力指数和蠕变激活能。通过分析蠕变激活能与车辙深度的关系，探讨了沥青混合料的蠕变机理。结果表明，随着温度的升高，三种沥青混合料的E-1、eta（1）、E-2和rig四个参数普遍降低。但在不同温度下，这三种混合物的粘弹性参数并不相同。应力水平对沥青混合料的粘弹性能有显著影响。当应力水平为0.5MPa时，四个粘弹性参数差异最大，但不同级配沥青混合料对应力水平的响应不同。随着温度和荷载应力的增加，稳态蠕变速率逐渐增大，但这三种沥青混合料的应力指标相差不大。蠕变速率均小于3，属于集合体界面位错机制控制下的扩散蠕变。蠕变活化能越大的沥青混合料高温稳定性越好。AC-16混合料具有最高的蠕变激活能。公称粒度不是高温性能的决定性因素。(C)2018爱思唯尔有限公司版权所有。
Asphalt mixture is a typical viscoelastic material. Its mechanical response and deformation behavior depend on the role of time, temperature conditions and stress levels. Three kinds of asphalt mixture (i.e. AC-13, AC-16, AC-20) were used for the static creep test in different temperature conditions and stress levels. According to the creep curve, The Burgers viscoelastic parameters including E-1, eta(1,) E-2, eta(2) and the steady-state creep rate K were obtained. The effects of test temperature, stress level and aggregate gradation on the viscoelastic parameters of asphalt mixture were analyzed. Based on the relationship between the steady-state creep rate and the experimental temperature & load stress, the stress index and creep activation energy of asphalt mixture were proposed. By analyzing the relationship between the creep activation energy and the rutting depth, the creep mechanism of the asphalt mixture was discussed. The results show that with the increase of temperature, the four parameters of E-1, eta(1), E-2 and rig of the three kinds of asphalt mixtures generally decrease. But at different temperatures, the viscoelastic parameters of these three kinds of mixtures are not the same. The stress level has a significant effect on the viscoelastic properties of the asphalt mixture. The four viscoelastic parameters have the largest differences when the stress level is at the intermediate load level of 0.5 MPa, but the responses of the different gradation asphalt mixture to the stress level are different. With the increase of temperature and load stress, the steady-state creep rate increases gradually, but the stress indexes of these three kinds of asphalt mixtures stress index are not different. All of them are less than 3, and belong to the diffusion creep under the control of aggregate interface dislocation mechanism. The asphalt mixture that has larger creep activation energy has better stability under high temperature. AC-16 mixture has the highest creep activation energy. Nominal particle size is not a decisive factor for the performance in high temperature. (C) 2018 Elsevier Ltd. All rights reserved.