1 School of Transportation, Changsha University of Science and Technology, Changsha 410114, China
2 Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education, Changsha University of Science & Technology, Changsha 410114, China
3 Hunan Expressway Construction Engineering Co., Ltd., Yongzhou 425000, China
High-modulus asphalt mixtures are primarily employed to mitigate rutting distress in asphalt pavements. In addressing the effects of heterogeneous temperature fields under actual service conditions, a viscoelastic constitutive model for asphalt mixtures was derived, and a thermo-mechanically coupled viscoelastic dynamic analysis model incorporating temperature gradients was established. A quantitative method for characterizing depth-dependent viscoelastic properties was also proposed. Through dynamic modulus testing, broad-temperature-domain viscoelastic master curves were constructed using Boltzmann superposition principle and GaussAmp modeling. By integrating actual pavement temperature gradients, a unified 3D dynamic modulus surface model was developed. Results demonstrate that temperature gradients induce a significant stratified distribution of viscoelastic parameters: the dynamic modulus in the surface high-temperature zone (52 ℃) is reduced by 172% compared to that in deeper layers (40 ℃), and stress relaxation times are shortened by an order of magnitude. The developed pavement viscoelastic dynamic analysis model effectively characterizes the influences of temperature gradient, loading rate, and dwell time effects on viscoelastic responses of asphalt pavements. Thermo-coupled rutting analysis reveals that predicted rut depths under a non-uniform field deviate by 19.3% to 250.9% from those under a uniform temperature field, verifying that the effect of temperature gradient cannot be neglected. By utilizing a self-developed viscoelastic UMAT subroutine and a gradient parameter mapping method, a multiphysics-coupled analysis framework suitable for complex climatic conditions is established for high-modulus asphalt pavements, providing theoretical and technical support for rutting prediction and maintenance decision-making.
LIU Zhao-hui, YU Shi-qing, HUANG You, LIU Li, ZHANG Long-ke, LIU Ze-bin.
Investigation of Non-uniform Modulus Fields and Rutting Evolution in Asphalt Pavements Coupled with Temperature Gradients[J].
Science Technology and Engineering, 2026, 26(21): 9245-9259 DOI:10.12404/j.issn.1671-1815.2505249
高温下材料的黏弹性响应等效于低温下的更长加载时间(或更低频率),反之亦然。通过引入移位因子aT,可将不同温度的模量-频率数据平移至参考温度下的主曲线[32]。通过试错法或优化算法(如最小二乘法)调整aT,使各温度下的数据在lg fr= lg f+lgaT坐标系中重叠最优。移位因子采用WLF方程(Williams-Landel-Ferry Equation),其数学表达式如式(2)所示。
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