To explore the interactions and mechanisms of Thermoplastic polyurethane (TPU)-modified asphalt with different kinds of mineral fillers, a micro-mechanical model for TPU-modified asphalt mastic was established, which considered the interaction between asphalt and mineral powder to effectively analyze the internal mechanisms affecting the rheological properties of TPU-modified asphalt mastic. In this study, according to the micro-mechanics of composites’ principles, the dynamic shear modulus (|G^*|) of asphalt mastic with different mass ratios of filler/asphalt (F/A) was calculated by the homogenize morphologically representative pattern (H-MRP) model. The key ratio of F/A, which is close to the test result, can be determined, and a four-phase H-MRP model of the TPU modified asphalt mastic was established after considering the structure of asphalt layer thickness. The results were interpreted based on the known reactions of TPU with asphalt model compounds. The |G^*| of TPU-modified asphalt mastic was predicted by using this model. Furthermore, the effects of the complex shear modulus, Poisson’s ratio of TPU-modified asphalt, Poisson’s ratio, particle size of mineral powder, and thickness of the structural asphalt layer in the |G^*| of TPU-modified asphalt mastic were analyzed in the whole-model construction, as well as the internal mechanism of the |G^*| of TPU modified asphalt mastic. In addition, can also be found the predicted value of |G^*| calculated by the four-phase H-MRP model is close to the experimental value after choosing a structural asphalt layer of appropriate thickness.

中文翻译：

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TPU改性沥青胶泥的微观力学建模研究

为探索热塑性聚氨酯（TPU）改性沥青与不同矿物填料的相互作用及其机理，建立了热塑性聚氨酯（TPU）改性 沥青胶粘剂的微观力学模型，该模型考虑了沥青与矿物粉体之间的相互作用，有效分析了其内部结构。影响 TPU 改性沥青胶泥流变性能的机理。在本研究中，根据复合材料的微观力学原理，动态剪切模量 (| G ^*通过均质形态代表模式（H-MRP）模型计算了不同填料/沥青质量比（F / A）的沥青胶粘剂。可以确定与试验结果接近的关键F/A比，并在考虑沥青层厚度结构的基础上，建立了TPU改性沥青胶泥的四相H-MRP模型。基于 TPU 与沥青模型化合物的已知反应来解释结果。该| G ^* | 使用该模型预测 TPU 改性沥青胶泥的用量。进一步分析了复合剪切模量、TPU改性沥青泊松比、泊松比、矿粉粒径、沥青结构层厚度等因素的影响。克^*| 分析了TPU改性沥青胶泥在整个模型构建中的作用，以及其内部机理。G ^* | TPU 改性沥青胶泥。另外，还可以求出|G ^* |的预测值。选择合适厚度的结构沥青层后，四相 H-MRP 模型计算得到的结果与实验值接近。