Aging has a significant effect on the performance of asphalt material. Reliable modelling of the change of asphalt mixture properties over time is crucial to evaluating and predicting the performance of the designed pavement. The objective of this study is to develop an aging model to accurately predict the cracking performance of asphalt mixtures over the pavement service life, as well as evaluate the aging susceptibility of mixtures over time. In this study, nine loose mixtures were conditioned in an oven at 95 °C for multiple durations to simulate different field aging times. The climatic aging index (CAI) developed by the National Cooperative Highway Research Program (NCHRP) 09-54 project was utilized to calculate the appropriate field aging durations corresponding to the different laboratory aging conditions. Complex modulus tests (E*) were conducted to measure the rheological properties of the conditioned mixtures and further construct the dynamic modulus and phase angle mastercurves. The mixture Glover–Rowe (G–R_m) parameter, incorporating both stiffness and relaxation capacity, was selected and used as the Aging Index Property to model the changes in mixture cracking properties with aging. The results of this study indicate that the developed mixture aging model can effectively capture the two aging reaction periods (fast and constant) of asphalt materials. The developed model can not only be used to evaluate the change of cracking properties over pavement service life, but also detect the aging susceptibility of asphalt mixtures.

老化对沥青材料的性能有显着影响。对沥青混合料特性随时间变化的可靠建模对于评估和预测设计路面的性能至关重要。本研究的目的是开发老化模型，以准确预测沥青混合料在路面使用寿命期间的开裂性能，并评估混合料随时间的老化敏感性。在这项研究中，九种松散的混合物在 95 °C 的烘箱中调节多个持续时间，以模拟不同的现场老化时间。利用国家公路合作研究计划（NCHRP）09-54项目开发的气候老化指数（CAI），计算出对应不同实验室老化条件的合适的田间老化持续时间。复数模量测试（进行 E *) 以测量调节混合物的流变特性并进一步构建动态模量和相角主曲线。混合物 Glover-Rowe ( G – R _m ) 参数结合了刚度和松弛能力，被选择并用作老化指数特性，以模拟混合物开裂特性随老化的变化。本研究结果表明，所开发的混合料老化模型可以有效地捕捉沥青材料的两个老化反应阶段（快速和恒定）。所开发的模型不仅可以用于评估路面使用寿命期间开裂性能的变化，还可以检测沥青混合料的老化敏感性。