Abstract Sasobit is an additive to produce asphalt mixes suitable for the use at lower construction temperatures without sacrificing the mix properties. However, Sasobit damages the time–temperature superposition principle (TTSP) of asphalt. Therefore, it is difficult to characterize the constitutive equation of Sasobit-modified asphalt. This study has modeled the rheological response of Sasobit-modified bitumen (two types) using a combination of two different models that describe gel-asphalt and sol-asphalt, respectively. Sasobit-modified asphalt is cooled after heating, the wax forms a crystal network structure, and gel-asphalt is obtained. The creep process of Sasobit-modified asphalt can be described by a nonlinear model, which is accompanied by the damage of the network structure, and thus, sol-asphalt is obtained. The network structure change of the wax in the asphalt may explain the mechanism of deviation from TTSP, and the structural characteristics of Sasobit-modified asphalt could be clearly described by the combined model. This will provide a foundation for accurately acquiring the rheological properties of Sasobit-modified asphalt.

中文翻译：

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Sasobit改性沥青的粘弹性模型及结构特性

摘要 Sasobit 是一种添加剂，用于生产适合在较低施工温度下使用的沥青混合料，而不会牺牲混合性能。然而，Sasobit 破坏了沥青的时间-温度叠加原理（TTSP）。因此，很难表征 Sasobit 改性沥青的本构方程。本研究使用分别描述凝胶-沥青和溶胶-沥青的两种不同模型的组合，对 Sasobit 改性沥青（两种类型）的流变响应进行了建模。Sasobit改性沥青加热后冷却，蜡形成晶体网络结构，得到凝胶沥青。Sasobit改性沥青的蠕变过程可以用非线性模型来描述，伴随着网络结构的破坏，从而得到溶胶-沥青。沥青中蜡的网络结构变化可以解释偏离TTSP的机理，组合模型可以清楚地描述Sasobit改性沥青的结构特征。这将为准确获取 Sasobit 改性沥青的流变特性奠定基础。