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首页> 外文会议>Proceedings of the Fifty-Third annual conference of the Canadian Technical Asphalt Association(CTAA) >Dynamic Modulus and Linear Viscoelastic Characterization of Asphalt Mixes
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Dynamic Modulus and Linear Viscoelastic Characterization of Asphalt Mixes

机译：沥青混合料的动态模量和线性粘弹性表征

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摘要

The performance of an engineering material is determined by the relationship between the stress and thernstrain in the material. Asphalt binders and asphalt mixes are viscoelastic materials which can berncharacterized, in the linear viscoelastic domain, by various dynamic material functions. With the newrnAASHTO pavement design guide, the complex modulus is one of the material functions to be studied.rnThis paper deals with the study of the use of the linear viscoelastic theory to obtain the complex modulusrnmaster curves in asphalt mixes based on small amplitude oscillations (dynamic modulus) at differentrntemperatures and frequencies. Three different configurations of dynamic modulus tests on cylindricalrnsamples loaded axially were analyzed: compression, tension, and compression/tension. The dynamicrnmodulus using uniaxial extension or compression-extension produced similar values for the temperaturesrnand frequencies used. The complex axial dynamic modulus in uniaxial compression mode resulted inrnhigher values when the sample was tested at low frequencies or higher temperatures. The feasibility ofrnusing dynamic modulus tests on asphalt mix cylindrical samples, loaded in uniaxial compression mode,rnwas shown. The linear viscoelastic description of asphalt mixes seems to be possible when this test isrnused. The limits of the linear viscoelastic domain and the validity of the time-temperature superpositionrnprinciple for the master curve in asphalt mix were confirmed. Furthermore its was found that the storagernand loss moduli, and horizontal shift factors for the Superpave? and SMA mixes, prepared with the samernasphalt binder, are very similar. The dependence of Poisson’s ratio on frequency and temperature wasrnobserved. Thus the role of Poisson’s ratio in the constitutive equation has to be studied further.
机译：工程材料的性能取决于材料中的应力与热应变之间的关系。沥青粘合剂和沥青混合料是粘弹性材料，可以通过各种动态材料功能在线性粘弹性域中表征。借助最新的AASHTO路面设计指南，复数模量是要研究的材料功能之一。本文涉及使用线性粘弹性理论基于小振幅振动（动态）获得沥青混合料的复数模量主曲线的研究。模量）在不同的温度和频率下。分析了轴向加载的圆柱形样品的动态模量测试的三种不同配置：压缩，拉伸和压缩/拉伸。对于使用的温度和频率，使用单轴扩展或压缩扩展的动态模量产生相似的值。当在低频或更高温度下测试样品时，单轴压缩模式下的复杂轴向动态模量导致更高的值。显示了在单轴压缩模式下对沥青混合料圆柱样品进行动态模量测试的可行性。当使用该试验时，沥青混合料的线性粘弹性描述似乎是可能的。确认了线性粘弹性域的极限以及沥青混合料中主曲线的时温叠加原理的有效性。此外，还发现了Superpave？的储能模量和损耗模量以及水平位移因子。与使用相同的沥青混合料制备的SMA混合物非常相似。泊松比对频率和温度的依存关系被观察到。因此，泊松比在本构方程中的作用必须进一步研究。

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