Abstract The article presents a new model for the use in the framework of the Discrete Element Method to simulate the mixing processes of fresh concrete. The model provides a representation of liquid transfer from fluid entities or moist solid particles to dryer solid particles, including volume adaptation and mass conservation. The parameters and laws of force interactions between two particles are defined locally and depend on the amount and the properties of the liquid phase in the contact area. If two dry particles are in contact, friction and elastic forces are computed based on the Hertz-Mindlin model. If two particles with low moisture content are in contact, additional liquid bridge forces act on the particles. When the suspension state is reached, a Bingham-based model is applied. The simulation enables realistic estimation of the moisture distribution during the mixing processes, the corresponding changes in forces acting on the particles and consequently the effect on the rheological properties of the concrete mixture.

中文翻译：

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在考虑加水和水分分布变化的情况下，使用离散元法 (DEM) 模拟新拌混凝土的搅拌过程

摘要 本文提出了一种在离散元法框架中使用的新模型来模拟新拌混凝土的搅拌过程。该模型提供了从流体实体或潮湿固体颗粒到干燥固体颗粒的液体转移的表示，包括体积适应和质量守恒。两个粒子之间的力相互作用的参数和定律是局部定义的，取决于接触区域中液相的数量和性质。如果两个干粒子接触，则根据 Hertz-Mindlin 模型计算摩擦力和弹力。如果两个低水分含量的颗粒接触，额外的液桥力会作用在颗粒上。当达到悬挂状态时，将应用基于宾汉姆的模型。