Investigations on viscosity and flow behavior of polyphosphoric acid (PPA) modified asphalt at high temperatures

流变学 粘度 热力学 剪切速率 材料科学 液体粘度的温度依赖性 阿累尼乌斯方程 活化能 沥青 相对粘度 幂律 粘度指数 时间-温度叠加 复合材料 化学 粘弹性 数学 有机化学 物理 扫描电子显微镜 统计 基础油
作者
Xiuming Jiang,Peilong Li,Zhan Ding,Liangdong Yang,Junkai Zhao
出处
期刊:Construction and Building Materials [Elsevier BV]
卷期号:228: 116610-116610 被引量:55
标识
DOI:10.1016/j.conbuildmat.2019.07.336
摘要

The rheological behavior of asphalt binders is composed of the deformation behavior at medium-low temperature and the flow behavior at high temperature, however, few researchers pay attention to the latter for polyphosphoric acid (PPA) modified asphalt. To analyze viscosity characteristics and flow behavior of PPA modified asphalt, six kinds of PPA modified asphalts with different mass fractions were prepared, and the effects of PPA dosage, test temperature and shear rate on the Brookfield rotary viscosity were discussed. The rheological parameters, viscous activation energy Eη, flow index n and consistency coefficient k were obtained based on Arrhenius law and the power law model, and the flow master curve was established by the time-temperature superposition principle. The results show that viscosity is positively correlated with PPA dosage, approximately, conforms to the exponential growth model. Meanwhile, viscosity is negatively correlated with test temperature and shear rate, respectively, in accordance with Arrhenius equation and power law equation. Under the test conditions, the flow index n of six kinds of asphalts goes up with the increase of PPA dosage or the decrease of temperature. However, all the n values are less than 1, indicating asphalts are pseudo-plastic fluid. The consistency coefficient k is consistent with the viscosity with the change of PPA dosage and test temperature, and may represent viscosity to a certain extent. The flow master curve with three parameters established can describe the effects of test temperature and shear rate on viscous flow characteristics. In this investigation, the non-Newtonian flow behavior of PPA modified asphalt was analyzed from the perspective of viscosity, proposing a method to estimate the dependence of viscosity on test conditions in a wider range through limited experimental data. This method is not only applicable to PPA modified asphalt, but also can provide references for the study of viscous flow characteristics of other asphalt binders.
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