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Characterization of the shear-thinning behavior of asphalt binders with consideration of yield stress

机译：考虑屈服应力的沥青粘合剂剪切稀疏行为的表征

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This study focused on characterizing the shear-thinning behavior of asphalt binders. The first objective was to identify the existence of yield stress behavior and to employ a rheological model to describe the flow curve of asphalt binders. The second objective was to verify the applicability of the Cox-Merz rule to asphalt binders with consideration of yield stress. A Dynamic Shear Rheometer (DSR) was employed to perform the frequency sweep test and the shear rate sweep test on three types of neat asphalt binders at 50, 60 and 70 °C. The test results of both tests confirmed the yield stress behavior of selected asphalt binders. The asphalt binders were then classified as the shear-thinning liquids with yield stress. As a result, the zero shear viscosity (ZSV), which was utilized as a rutting indicator, was not an indicator of the shear viscosity at zero shear rate but corresponded to the shear viscosity of a Newtonian plateau at low shear rates. A modified Carreau model was employed to characterize the shear-thinning behavior of asphalt binders, which demonstrated the ability to account for the yield stress behavior. The applicability of the Cox-Merz rule was examined by establishing the flow curve and the log-log plot of complex viscosity versus angular frequency in the same graph with respect to each replicate at each temperature. It was demonstrated that the Cox-Merz rule was followed in part of the ZSV region and part of the shear-thinning region but not followed in the yield stress region.
机译：本研究重点是表征沥青粘合剂的剪切稀释行为。第一个目的是识别产量应激行为的存在，并使用流变模型来描述沥青粘合剂的流动曲线。第二个目的是考虑屈服应力验证Cox-Merz规则对沥青粘合剂的适用性。使用动态剪切流变仪（DSR）在50,60和70℃下进行三种类型的沥青粘合剂的频率扫描试验和剪切速率扫描试验。两种测试的测试结果证实了所选沥青粘合剂的屈服应力行为。然后将沥青粘合剂分类为具有屈服应力的剪切稀释液体。结果，用作车辙指示剂的零剪切粘度（ZSV）不是零剪切速率下剪切粘度的指示，但与低剪切速率的牛顿平台的剪切粘度相对应。使用改性的Carreau模型来表征沥青粘合剂的剪切稀释行为，这证明了屈服应力行为的能力。通过在每个温度下建立相对于每次重复的每次重复，通过建立流动曲线和复合粘度与角频率的对数曲线图来检查Cox-Merz规则的适用性。结果证明了Cox-Merz规则遵循部分ZSV区域和部分剪切变薄区域，但在屈服应力区域中不遵循。

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