Abstract

The operating conditions of current highways require the development and implementation of new testing standards for pavement materials with regard to dynamic impact. Pavement materials have a complex hierarchical structure exhibiting a self-consistent response to load at different scale levels. The corresponding parameters of the phenomenological models used for macroscopic objects essentially depend on lower-scale processes, and this relationship determines the behavior and strength of the material under both static and dynamic loading. This paper reports dynamic test results for some bitumen binders and asphalt concrete, and provides their analysis on the basis of the incubation time criterion. The tests were conducted using a split Hopkinson pressure bar on materials previously exposed to room or negative (–10°C) temperature. Experimental data showed that the structural-temporal approach based on the concept of the incubation time of fracture can be a good tool for analyzing and predicting the dynamic strength effects of pavement materials. Since the fracture incubation time characterizes the duration of macrofracture preparation processes at different scale levels, control over this parameter through the structural features of the material can provide the desired material response to dynamic load. The proposed structural-temporal parameters can be incorporated into new standards developed with the idea of a differential choice of materials depending on the expected highway operating conditions.

中文翻译：

---

沥青混合料沥青混合料断裂时效的动态强度分析。

摘要

当前的高速公路的运行条件要求开发和实施关于动态影响的路面材料的新测试标准。路面材料具有复杂的层次结构，对不同比例级别的载荷表现出自洽的响应。用于宏观物体的现象学模型的相应参数基本上取决于较低尺度的过程，这种关系决定了材料在静态和动态载荷下的行为和强度。本文报告了某些沥青粘合剂和沥青混凝土的动态测试结果，并根据保温时间标准对其进行了分析。使用对开的霍普金森压力棒对先前暴露于室温或负（–10°C）温度的材料进行测试。实验数据表明，基于裂缝保温时间的时空结构方法可以很好地分析和预测路面材料的动力强度效应。由于裂缝的孵育时间表征了不同规模水平下大裂缝制备过程的持续时间，因此通过材料的结构特征控制该参数可以提供所需的材料对动态载荷的响应。可以将拟议的结构-时间参数并入新标准中，该新标准是根据预期的高速公路运行条件以不同材料选择的思想开发的。通过材料的结构特征对该参数的控制可以提供所需的材料对动态载荷的响应。可以将拟议的结构-时间参数并入新标准中，该新标准是根据预期的高速公路运行条件以不同材料选择的思想开发的。通过材料的结构特征对该参数的控制可以提供所需的材料对动态载荷的响应。可以将拟议的结构-时间参数并入新标准中，该新标准是根据预期的高速公路运行条件以不同材料选择的思想开发的。