【摘要】 为了提升沥青混合料黏弹性参数的换算精度，探究沥青混合料连续时间谱的确定与换算方法，利用改进Sigmoidal函数得到了连续时间谱的显式计算公式，提出了基于连续时间谱的沥青混合料黏弹性参数换算流程，实现了由频域黏弹性参数向时域黏弹性参数的换算，采用Mix-9.5、Mix-19、Mix-25沥青混合料的复数模量和蠕变柔量试验对黏弹性参数的换算精度进行验证。结果表明，利用改进Sigmoidal函数计算得到的沥青混合料连续时间谱能够有效避免不良谱线产生，取时间点间距N=1时，基于连续时间谱换算得到的蠕变柔量较离散时间谱更接近于试验值，换算得到的松弛系和蠕变系参数曲线符合沥青混合料的黏弹性参数曲线特征，具有较好的换算一致性。更多还原

【Abstract】 To enhance the accuracy of viscoelastic parameter conversions for asphalt mixtures while exploring the determination and conversion methods of continuous time spectra for these materials, an explicit calculation formula for continuous time spectra was derived using an improved Sigmoidal function. Additionally, a viscoelastic parameter conversion process for asphalt mixtures was proposed based on this approach, enabling frequency-domain viscoelastic parameters to be converted to time-domain viscoelastic parameters. To validate the accuracy of these conversions, complex modulus and creep compliance tests were conducted on Mix-9.5, Mix-19, and Mix-25 asphalt mixtures. Results indicate that the generation of non-performing spectra can be effectively mitigated through the use of the improved Sigmoidal function when calculating the continuous time spectra of asphalt mixtures. Furthermore, when taking a time point interval N=1, creep compliance converted based on continuous time spectra is closer to the experimental value than that converted based on discrete time spectra. Notably, the curves of relaxation and creep compliance parameters converted align with the characteristics of the viscoelastic parameter curves of asphalt mixtures, resulting in strong consistency regarding the conversion process.更多还原