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老化沥青混合料的松弛模量模型

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Keywords: 道路工程,沥青混合料,试验,松弛模量,应力松弛,老化,移位因子,广义Maxwell模型,Burgers模型

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Abstract:

通过对沥青混合料AC-13C进行5种不同程度老化,然后再进行-5℃条件下的应力松弛试验,研究老化对其应力松弛性能的影响并建立耦合老化程度因子的松弛模量模型。对比不同老化程度沥青混合料的松弛模量曲线,发现老化程度与松弛时间之间存在一定的等效性;基于材料黏度的自由体积理论,通过假设沥青混合料的自由体积分数与老化程度间呈线性关系,研究并建立了沥青混合料的老化程度-松弛时间等效移位因子;对松弛模量主曲线分别采用Burgers模型和不同单元数目的广义Maxwell模型进行非线性拟合,表明广义Maxwell模型在表征松弛模量变化时优于Burgers模型,且单元数越多,拟合精度越高,考虑到拟合精度和参数数目,推荐采用六单元广义Maxwell模型,并建立耦合老化程度因子的松弛模量模型。

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