In the present work, rheological behaviors of fresh cement paste are studied based on multi-disciplinary approaches, i.e., colloidal suspension using attractive van der Waals force, rheology using the Bingham model and Bingham–Papanastasiou model, which are able to describe the behavior of cement pastes before and after yield stress, and finally the continuum mechanics based on Maxwell and Kelvin–Voigt models. To achieve this, the fresh cement paste with different water-to-cement ratios of 0.3 up to 0.6 is prepared. The attractive van der Waals forces are estimated based on the distances between solid cement particles, which vary at every single water-to-cement ratio. The rheology experiments of all water-to-cement ratios are performed using a rheometer. According to our experimental outcomes, the Bingham and Bingham–Papanastasiou models are applied in the modeling of the experimental curves and determination of yield stress and viscosity. Maxwell and the Kelvin–Voigt models are utilized in describing solid-like behavior before yield stress and fluid-like behavior beyond yield stress. It is observed that the increase of water generates a decrease in the viscosity, yield stress, and packing concentration of solids. It also increases the distances between two cement particles in the cement pastes. According to the modeling results, the Bingham–Papanastasiou model is well adapted for the cement paste flow due to its additional modeling parameter, which is known as m . The role of m is understood and described by linking the van der Waals interaction, rheology, and three-element Kelvin–Voigt model as a whole in function of water-to-cement ratio. m is understood as a key parameter in which the distance between particles affects the rheological behavior of fresh cement pastes. Lastly, the two-phase flow simulations have been successfully achieved and compared with the experiments. The conclusion and outlooks are summarized and discussed at the end of the paper.

中文翻译：

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从胶体悬浮液到三元素 Kelvin-Voigt 模型的新鲜水泥浆体的流变特性

在目前的工作中，基于多学科方法研究新鲜水泥浆体的流变行为，即使用范德华力的胶体悬浮、使用宾厄姆模型和宾厄姆-帕帕纳斯塔西欧模型的流变学，它们能够描述水泥浆体的行为。屈服应力前后的水泥浆体，最后是基于 Maxwell 和 Kelvin-Voigt 模型的连续介质力学。为了实现这一点，制备了具有 0.3 至 0.6 的不同水灰比的新水泥浆。引力范德华力是根据固体水泥颗粒之间的距离估算的，该距离在每个单一的水灰比下都会发生变化。所有水灰比的流变实验均使用流变仪进行。根据我们的实验结果，Bingham 和 Bingham-Papanastasiou 模型应用于实验曲线的建模以及屈服应力和粘度的确定。Maxwell 和 Kelvin-Voigt 模型用于描述屈服应力之前的类固体行为和屈服应力之外的类流体行为。据观察，水的增加导致固体的粘度、屈服应力和堆积浓度降低。它还增加了水泥浆中两个水泥颗粒之间的距离。根据建模结果，Bingham-Papanastasiou 模型由于其附加的建模参数 m 非常适合水泥浆流动。通过将范德瓦尔斯相互作用、流变学、和三元素 Kelvin-Voigt 模型作为一个整体作为水灰比的函数。m 被理解为一个关键参数，其中颗粒之间的距离影响新水泥浆体的流变行为。最后，成功地实现了两相流模拟并与实验进行了比较。论文最后对结论和展望进行了总结和讨论。