沥青混合料动静态黏弹性主曲线转化与比较  

Viscoelastic Master Curve Transformation and Comparison of Asphalt Mixture Under Dynamic and Static Loads

作　　者：黄宣 白桃 张德育[2] 陈何文 毛博温 HUANG Xuan;BAI Tao;ZHANG De-yu;CHEN He-wen;MAO Bo-wen(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan,Hubei 430073,China;School of Civil Engineering and Architecture,Nanjing Institute of Technology,Nanjing,Jiangsu 211167,China;Hubei Communications Planning and Design Institute Co.,Ltd.,Wuhan,Hubei 430051,China)

机构地区：[1]武汉工程大学土木工程与建筑学院,湖北武汉430073 [2]南京工程学院建筑工程学院,江苏南京211167 [3]湖北省交通规划设计院股份有限公司,湖北武汉430051

出　　处：《公路交通科技》2024年第6期1-8,64,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52108415);湖北省自然科学基金项目(2020CFB567);交通运输部重点研发项目(2020-MSI-061)。

摘　　要：为对比沥青混合料分别在动态和静态加载下各自模量主曲线换算得到的松弛模量,选用5种沥青进行了不同温度、不同荷载大小的动态模量和蠕变柔量测试。首先基于时温等效原理,利用试验获得的不同频率、不同温度下的动态模量值以及不同温度、不同应力水平加载下的蠕变柔量值,通过Sigmoid函数以及WLF方程拟合获取沥青混合料的动态模量与蠕变柔量主曲线。采用广义Maxwell和广义Kelvin模型分别模拟沥青混合料的松弛与蠕变性能,最后利用Laplace变换和Prony级数表达式,实现了黏弹性参数间的相互换算。结果表明:动态模量及蠕变柔量主曲线的相互换算结果与试验结果规律基本一致,不同应力加载的蠕变柔量与动态模量转化的松弛模量主曲线整体曲线形式相同、曲率变化不同;应力大小对于蠕变柔量影响较大,时域内加载应力越大,蠕变柔量越小,较低时域时,蠕变柔量数值在不同应力条件下相差不大,随着时域升高,加载应力越小蠕变柔量主曲线增幅越大;0.5 MPa荷载加载下的蠕变柔量与动态模量所转化的松弛模量有较高的拟合程度,在10^(-4)-10^(+3)s中频域段,不同沥青混合料分别采用动态模量和静态柔量转换获得的松弛模量差值均在15%以内;实际工程中可利用试验较为简单的0.5 MPa静态加载获得到蠕变柔量代替动态模量进行松弛模量计算,并优先选用转化后10^(-4)-10^(+3)s中频域段的松弛模量值。In order to compare the relaxation modulus of asphalt mixture derived from modulus master curves under dynamic and static loads respectively,5 kinds of asphalt mixtures are selected to undertake the dynamic modulus and creep compliance tests.Firstly,based on the time-temperature equivalent principle,the master curves of dynamic modulus and creep compliance of asphalt mixtures are obtained by Sigmoid function and WLF equation fitting with dynamic modulus values at different frequencies and temperatures and creep compliance values at different temperatures and stress levels obtained by experiments.The generalized Maxwell and generalized Kelvin models are used to simulate the relaxation and creep properties of asphalt mixture respectively.Finally,the mutual conversion among viscoelastic parameters is realized by using Laplace transform and Prony series expressions.The result shows that the inter-conversion values of dynamic modulus and creep compliance master curves are basically consistent with the test results,and the relaxation modulus master curves transformed by creep compliance under different stress loads has the same form and different curvature as that transformed by dynamic modulus.The applied load stress has great influence on creep compliance,The larger the loading stress in the time domain,the smaller the creep compliance.In the lower time domain,the creep compliance values have little difference under different stress conditions with the increase of time domain,the smaller the loading stress,the greater the increase of creep compliance master curves.The relaxation modulus,derived from creep compliance under 0.5 MPa loading,fit well with the value transformed by dynamic modulus.In the frequency domain of 10^(-4)-10^(+3)s,the difference of relaxation modulus obtained by dynamic modulus and static compliance is less than 15%for all the asphalt mixtures.For simplicity,the creep compliance test under 0.5 MPa could be used to substitute the dynamic modulus test in practical engineering,where the calculated r

关 键 词：道路工程 主曲线 数值转换法 黏弹性 沥青混合料 

分 类 号：U416.217[交通运输工程—道路与铁道工程]