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沥青混合料动态粘弹性行为分析的模拟方法

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Keywords: 道路工程,沥青混合料,Havriliak-Negami模型,动态粘弹性,复数模量,主曲线

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Abstract:

?为了更好地分析沥青混合料的动态粘弹性行为,描述了一种基于Havriliak-Negami(HN)模型的模拟方法。利用3种不同类型的沥青混合料复数模量试验数据对该方法的有效性进行了说明,并将结果与Sigmoidal方法的计算结果进行了比较分析。结果表明:该方法克服了Sigmoidal方法模拟沥青混合料动态粘弹性行为的3个主要缺点,HN模型提供了一个非对称的拐点,能模拟更为复杂的非对称动态粘弹性行为;不同粘弹性函数的解析式均来源于同一个复数模量模型,模型间精确满足Kronig-Kramers关系;在确定模型参数时同时考虑了储能模量和损耗模量,计算结果符合线粘弹性理论。HN模型可以精确描述沥青混合料与时间相关的粘性行为,故可以考虑用于基于层状粘弹性体系理论的路面设计方法。

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