应用主曲线确定沥青混合料的粘弹性参数

应用频率扫描试验测定了不同温度、不同频率作用下三种沥青混合料的动模量及相位角,并应用时温叠加原理及Sigmoidal函数确定了沥青混合料在某一参考温度下的动模量主曲线及相位角主曲线。同时以广义麦柯斯韦模型的本构关系为基础,通过傅立叶变换实现了沥青混合料频域模量到时域模量的转换,并根据动模量主曲线、相位角主曲线数据计算了沥青混合料的储能模量,在此基础上确定了广义麦柯斯韦模型的粘弹性参数。结果表明,应用频率扫描试验确定沥青混合料的粘弹性参数,较其他试验方法简单易行,数据稳定可靠。

Application of Master Curve to Determine of Viscoelastic Parameters of Asphalt Mixture

The dynamic modulus and phase angle of three kinds of asphalt mixture are determined by the frequency sweep test at different temperatures and frequencies.The time-temperature superposition principle and Sigmoidal function are applied to determine the master curves of the dynamic modulus and the phase angle of the asphalt mixture at the reference temperature.On the basis of the constitutive relation of Generalized Maxwell Model,the frequency domain modulus of asphalt mixture is transformed to the time domain modulus by Fourier Transform.The storage modulus of asphalt mixture is computed by the data of the master curves of the dynamic modulus and the phase angle.On this basis,the viscoelastic parameters of Generalized Maxwell Model are determined.The results indicate that frequency sweep test is better than the other tests to confirm the viscoelastic parameters of asphalt concrete.Frequency Sweep Test is simple and easy,and its data are stable and reliable.