It has been demonstrated that humidity, or water vapor, is a non-negligible contributor to moisture damage of asphalt pavements. However, little work has been done regarding the effect of humidity on the performance of asphalt mixtures. The objective of this paper was to investigate the linear viscoelastic (LVE) properties of asphalt mixtures under different humidity conditions. Specimens were first conditioned at four humidity levels and subsequently employed to perform dynamic modulus tests. Next, a shifting method for the master curve under humidity conditions was proposed to quantify the influence of water vapor on LVE properties of asphalt mixtures. Finally, the effect of humidity on LVE properties of asphalt mixtures was analyzed based on three aspects. The results show that the developed shift method is accurate enough to quantify the effect of humidity on master curves of asphalt mixtures since the error in any group is less than 2%, while each R² value exceeds 0.98. The rheological parameter E_e decreases, and R and m increase as the humidity levels rise. However, no obvious variation trend was found in the E_g, k, and f_c of different groups. The humidity factor g(H_i) shows a negative increasing trend based on the rise in humidity levels. Meanwhile, according to the developed three-dimensional master curves of dynamic modulus and phase angle of the two types of mixtures, dynamic modulus decreases and phase angle increases as humidity levels rise at low frequencies (or high temperatures). No significant differences were observed on dynamic modulus and phase angle among different groups at high frequencies. Thus, the developed three-dimensional dynamic modulus and phase angle master curves can determine dynamic modulus and phase angle under arbitrary humidity conditions.

已经证明，湿气或水蒸气是造成沥青路面湿损的不可忽视的因素。然而，关于湿度对沥青混合料性能影响的研究很少。本文的目的是研究沥青混合料在不同湿度条件下的线性粘弹性 (LVE) 特性。样品首先在四个湿度水平下进行调节，然后用于进行动态模量测试。接下来，提出了一种在湿度条件下主曲线的移动方法，以量化水蒸气对沥青混合料 LVE 特性的影响。最后，从三个方面分析了湿度对沥青混合料LVE性能的影响。²值超过 0.98。随着湿度水平的升高，流变参数E _e降低，而R和m增加。然而，不同组的E _g、k和f _c没有发现明显的变化趋势。湿度系数g ( H _i) 显示出基于湿度水平上升的负增长趋势。同时，根据两种混合物动态模量和相角的三维主曲线，在低频（或高温）下，随着湿度水平的升高，动态模量减小，相角增大。在高频下，不同组之间的动态模量和相角没有显着差异。因此，开发的三维动态模量和相位角主曲线可以确定任意湿度条件下的动态模量和相位角。