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沥青稳定碎石是一种粘弹塑性材料。常规的静态模量无法准确描述这种材料的特性,因此更适宜用动态模量来表达其力学参数。采用SPT对3种不同沥青结合料ATB25的动态模量进行试验。试验中考虑不同的加载频率、试验温度、围压等等,全面评价不同试验参数对沥青稳定碎石动态模量的影响。研究结果表明:结合料种类、加载频率以及试验温度对沥青稳定碎石的动态模量影响最为显著,而围压对于高温低频条件下的试验来说,对动态模量的影响稍大一些;动态、静态模量随温度以及粘结料类型的变化趋势相同,但是比值差别较大,这与两种条件下的加载模式不同有关。
Asphalt stabilized macadam is a viscoelastic plastic material. Conventional static modulus can not accurately describe the characteristics of this material, it is more appropriate to use dynamic modulus to express its mechanical parameters. The dynamic modulus of three different asphalt binder ATB25 was tested by SPT. In the experiment, different loading frequency, test temperature, confining pressure and so on are considered, and the influence of different test parameters on the dynamic modulus of asphalt stabilized macadam is fully evaluated. The results show that: the binder type, loading frequency and test temperature have the most significant impact on the dynamic modulus of bitumen stabilized macadam, while the confining pressure has a slightly larger effect on the dynamic modulus at high temperature and low frequency; , The static modulus changes with the temperature and the type of binder the same trend, but the difference is larger, which is related to the different loading modes under the two conditions.