Effect of aging on the dynamic mechanical properties of cement emulsified asphalt mastic
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摘要: 基于分数导数修正Burgers模型，建立了水泥乳化沥青胶结料（简称复合胶结料）的本构方程。结合不同材料配比的复合胶结料的老化试验及频率扫描试验，分析了老化时间及材料配比等因素对复合胶结料黏弹性力学参数的影响。研究表明，复合胶结料的存储模量与损耗模量均随老化时间的增加而增大，在老化时间为0~8 h时，存储模量及损耗模量增加较快，当老化时间超过8 h后，其增长趋势减缓。对于乳化沥青与水泥的质量比（mA/mC）为1.2和1.4的复合胶结料，在不同的加载频率下，其相位角均随老化时间的增加而减小。对于mA/mC为1.0的复合胶结料，其相位角随着老化时间的增加呈现先增加后减小的变化规律。随着老化时间的增加，复合胶结料趋向于弹性材料的力学性质。分数导数修正Burgers模型可以较好的描述老化后复合胶结料的黏弹性动态力学行为，模型参数弹性模量E1、黏度η1和分数导数r可以描述老化情况下材料黏弹特性的变化规律。Abstract: The constitutive equation of cement asphalt emulsified mastic (simplified as the composite mastic) was established based on Burgers model revised by fractional derivative. Combined with aging test and frequency scanning test of composite mastic of various mix proportions, the effects of aging time and mix proportion on the viscoelastic mechanical parameters of the composite mastic were analyzed. Study shows that with aging time increasing, both of the storage modulus and loss modulus of the composite mastic increase. The increase speed of the storage modulus and loss modulus are high during 0-8 h of aging, and then slow down after 8 h of aging. For the composite mastic at mass ratio of emulsified asphalt to cement (mA/mC) of 1.2 and 1.4, the phase angle decreases with the increase of aging time at different load frequencies. For the composite mastic at mA/mC of 1.0, the phase angle shows a rule of increasing first and then decreasing with the increase of aging time. With aging time increasing, the composite mastic tends to show mechanical properties like elastic materials. The Burgers model revised by fractional derivative can describe the viscoelastic dynamic mechanical behavior of the composite mastic after aging well, and the model parameters elastic modulus E1, viscosity η1 and fractional derivative r can describe change rules of the viscoelastic properties of the material in the case of aging well.
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