沥青动静态加载条件下的黏弹模型及模型普适性

Asphalt viscoelastic model and its universality under dynamic and static loading conditions

使用动态剪切流变仪(DSR)对沥青进行多温度条件下的动态频率扫描和静态蠕变试验,分别使用多种经典模型和分数阶导数模型描述沥青频率扫描下的黏弹性能,使用经典模型描述沥青静态蠕变行为,对模型参数进行分析,并建立同时满足频率扫描和蠕变试验的普适模型。结果表明:在动态条件下经典模型描述沥青流变行为有波动,而分数阶导数模型具有很好的拟合效果;静态条件下经典模型有较好的拟合效果,且模型参数满足阿仑尼乌兹方程,分数阶导数模型的参数无规律;使用的2种沥青仅在52℃存在能够同时满足静态和动态条件的普适模型,在其他温度段沥青模型无普适性。

The frequency sweep and creep tests of asphalt at different temperatures were carried out by dynamic shear rheometer(DSR).The various classical models and fractional derivative models were used to describe the viscoelasticity of asphalt under frequency sweep.The creep behavior of asphalt was characterized by classical models,in which the model parameters at different temperatures were analyzed.Furthermore,a universal model under different loading conditions was established.It is found that there are some fluctuations of the asphalt rheological properties described by the classical model at dynamic mode.Meanwhile,the fractional derivative model presents a good fitting result.The classical model shows a good fitting result under creep tests,and the model parameters are satisfied the Arrhenius equation.However,the fractional derivative model parameters at different temperatures are irregular.There is only a universal model which can be applied to static and dynamic conditions at 52℃.There is no universal model at other temperatures.