Calibrating the kneading contact model for simulating fresh concrete: Incorporating water addition

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-05-28 DOI:10.1016/j.powtec.2025.121188

Zhenjiao Sun , Lianjun Chen , Guanguo Ma , Hui Ma , Kang Gao

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引用次数: 0

Abstract

Fresh concrete, as a critical construction material, has its mixing process directly influencing its homogeneity and performance. This study calibrates the kneading contact model based on the Discrete element method (DEM) and proposes a systematic approach for DEM parameter calibration. Through rheological and water infiltration experiments, two key parameters—maximum surface energy and liquid conductivity—were determined. Results indicate that maximum surface energy exhibits a linear positive correlation with the maximum torque experienced by the rheometer probe (R² = 0.96), while liquid conductivity shows a linear negative correlation with water wetting height (R² = 0.95), with calibrated values of 214 J/m² and 2.52 s, respectively. Using the calibrated parameters, numerical simulations of fresh concrete mixing under various water-to-cement ratios were conducted, verifying the model's applicability in complex multiphase flow systems. The simulation results demonstrate that the calibrated kneading contact model accurately replicates the rheological properties and particle behaviors of concrete under different water-to-cement conditions, providing a reliable theoretical basis for optimizing concrete mix design and mixing processes.

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模拟新拌混凝土的揉捏接触模型的校正：加入水

新拌混凝土作为一种重要的建筑材料，其搅拌工艺直接影响混凝土的均匀性和性能。本文对基于离散元法（DEM）的揉捏接触模型进行了标定，提出了一种系统的DEM参数标定方法。通过流变学和水渗透实验，确定了两个关键参数——最大表面能和液体电导率。结果表明，最大表面能与流变仪探头所经历的最大扭矩呈线性正相关（R2 = 0.96），而液体电导率与水润湿高度呈线性负相关（R2 = 0.95），标定值分别为214 J/m2和2.52 s。利用标定后的参数，对不同水灰比下的新拌混凝土进行了数值模拟，验证了该模型在复杂多相流体系中的适用性。仿真结果表明，标定后的捏合接触模型准确再现了不同水灰条件下混凝土的流变特性和颗粒行为，为优化混凝土配合比设计和搅拌工艺提供了可靠的理论依据。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.