Static and dynamic mechanical behavior of cement asphalt mortars
Static and dynamic mechanical behavior of cement asphalt mortars
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发表时间：
2009
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通讯作者：
Y. Peiyu
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作者：
Y. Peiyu
研究了不同油石比（A/C）的水泥沥青胶结料（CAB）和水泥沥青砂浆（CAM）的静态和动态力学性能。采用动态力学分析（DMA）仪测量了CAB的动态模量和滞后角。利用MTS（材料试验系统）在静态和动态荷载下对CAM的力学性能进行了测试。结果表明，水泥沥青胶结料的动态模量随加载频率的增加而增大。对于不同油石比的CAB，滞后角随油石比的增加而增大，这意味着在CAB中掺入更多的沥青时，其粘弹性特征更加显著。CAM的抗压强度、弹性模量和损伤能随油石比的增加而降低。CAM的动态模量随油石比或加载频率的变化与CAB呈现相同的趋势。采用标准固体模型来描述CAM的力学行为，并通过将CAM的动态模量拟合到该模型中计算出所有力学参数。因此，力学行为得到了充分模拟，且模拟特征与实验测试结果相符。
Static and dynamic mechanical behaviors of cement asphalt binders(CABs) and cement asphalt mortars(CAMs) with different A/C were studied.Dynamic modulus and lag angles of CABs were measured by Dynamic Mechanical Analysis(DMA) apparatus.Mechanical properties of CAMs were tested by the MTS(Material testing system) under both static and dynamic loads.The results indicated that the dynamic modulus of the cement asphalt binder increasel with the loading frequency.For CABs with different A/C,lag angle increased with the increasing of A/C,implying the more remarkable visco-elasticity feature when more asphalt is incorporated into CAB.The compressive strength,the elastic modulus and the damage energy of CAMs decrease with the increasing of A/C.The dynamic modulus of CAMs show the same trend as that of CABs with the change of A/C or loading frequency.Standard solid model is applied to describe the mechanical behavior of CAMs and all mechanical parameters are calculated by fitting the dynamic modulus of CAMs into the model.Therefore the mechanical behavior is fully simulated and the simulated features are in line with those from experimental testing.