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粘弹性材料力学行为的主要特征是它的时间相关性,其本质在于材料内部时钟或特征时间的存在,这个特征时间受多种因素的影响,研究材料特征时间变化往往采用材料粘度的自由体积理论.根据自由体积理论,推导了表征时-温等效关系的WLF方程.老化同样影响材料的粘度,由已有的蠕变试验结果推导了沥青混合料的时间-温度、时间-老化、温度-老化等效关系式,这对研究沥青混合料的力学行为、结构分析以及寿命预估等具有重要的意义和价值.
The main characteristic of the viscoelastic material’s mechanical behavior is its time dependence. The essence of the viscoelastic material is its internal clock or characteristic time. This characteristic time is affected by many factors. The time-dependent change of the material characteristics often adopts the free volume theory According to the theory of free volume, WLF equation is derived to characterize the time-temperature equivalent relationship.Aging also affects the viscosity of the material, and the creep test results derived from the existing asphalt mixture time-temperature, time-aging, temperature- Aging equivalent relationship, which is of great significance and value for studying the mechanical behavior, structural analysis and life prediction of asphalt mixture.