Numerical Study on Concrete Pumping Behavior via Local Flow Simulation with Discrete Element Method

Zhan, Yijian; Gong, Jian; Huang, Y.; Shi, Chong; Zuo, Zhigang; Yi-qun, Chen

doi:10.3390/ma12091415

Cited by 27 publications

(12 citation statements)

References 58 publications

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“…The results showed that particles tend to aggregate at the bend. Similarly, Zhang Y [13] found that concrete fibers gather at the bend. CFD-DEM methods can be adversely affected by a considerable rigid body under mesh motion conditions.…”

Section: Introductionmentioning

confidence: 85%

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Chen

Lü

et al. 2022

Materials

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With an increase of suction efficiency of fresh concrete pumping in confined spaces, the laminar flow state will be damaged by the return flow caused by distribution value direction changes and concrete gravity. This is a fact, but one which is rarely studied. In this work, the flow state, flow velocity, and suction efficiency of fresh concrete pumping are simulated using the coupled smooth particle hydrodynamics and Discrete Elements Method (SPH-DEM). The rheological parameters and Herschel-Bulkley-Papanastasiou (HBP) rheological model are adopted to simulate fresh concrete in the numerical simulation model. The study reveals that the error between the slump experimental result and that obtained by the HBP model is negligible. A model is therefore established for numerical simulations of the suction efficiency of fresh concrete pumping. An experimental concrete pumping platform is built, and the pressure and efficiency data during pumping are collected. A comparison of the numerical simulation with experimental results shows that the error is less than 10%.

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Section: Introductionmentioning

confidence: 85%

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Chen

Lü

et al. 2022

Materials

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“…Numerical models can help in understanding the SIPM during pumping and characteristics of LL, as well as predicting pumping pressures. However, such tools have so far been simplified by the assumption of either a single-fluid homogeneous medium [23,24,25,28,34] or discrete granular elements [35]. In the case of concretes with high granular fractions, the interactions between aggregate and paste are crucial.…”

Section: Pumpingmentioning

confidence: 99%

Extrusion-based additive manufacturing with cement-based materials – Production steps, processes, and their underlying physics: A review

Mechtcherine

Bos

Perrot

et al. 2020

Cement and Concrete Research

354

127

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This article offers a comprehensive overview of the underlying physics relevant to an understanding of materials processing during the various production steps in extrusion-based 3D Concrete Printing (3DCP). Understanding the physics governing the processes is an important step toward the purposeful design and optimization of 3DCP systems as well as their efficient and robust process control. For some processes, analytical formulas based on the relevant physics have already enabled reasonable predictions with respect to material flow behavior and buildability, especially in the case of relatively simple geometries. The existing research in the field was systematically compiled by the authors in the framework of the activities of the RILEM Technical Committee 276 "Digital fabrication with cementbased materials". However, further research is needed to develop reliable tools for the quantitative analysis of the entire process chain. To achieve this, experimental efforts for the characterization of material properties need to go hand in hand with comprehensive numerical simulation.

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“…e experimental, analytical, and numerical results found that the behavior of the lubricating layer is similar to that of mortar in terms of rheology. Zhan et al [15] used the DEM to numerically simulate the local pumping problem and explored the influence of a series of factors on the local pumping performance, which were related to the pipe geometry, aggregate geometry, and pumping conditions. Shengqiang et al [16] used a computational fluid dynamics-discrete element method (CFD-DEM) coupling model to explore the influence of structural parameters and inclination angles of tapered pipes, elbows and their combinations on pressure loss, and proposed a pump truck conveying pipeline.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Stirring Blade Structure of the Pumping Unit Based on the Improvement of Concrete Suction Efficiency

Jiang

Wan

Cao

et al. 2022

Advances in Civil Engineering

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In this paper, a discrete element method (DEM) is used to simulate the suction process of fresh concrete in the pumping system, and the influence of the stirring blade on the suction is explored. The Hertz-Mindlin with JKR Cohesion contact model is used to establish the DEM model of fresh concrete, and the suction work is realized by an API function of DEM, and the movement of particles in the suction cylinder can be completed smoothly. The changes of the concrete flow field during the suction process are further studied, and the influence mechanism of the stirring blade on the suction process is explained. A numerical simulation scheme is designed to explore the influence of the rotation speed, installation angle, and edges distance of the stirring blade on the suction efficiency and the stirring resistance torque, and the structure of the stirring blade is optimized according to the influence law. The simulation results show that the stirring resistance torque of the optimized stirring blade is reduced without the suction efficiency of the pumping system reduced, and the stirring energy consumption of the pump suction is reduced.

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Numerical Study on Concrete Pumping Behavior via Local Flow Simulation with Discrete Element Method

Cited by 27 publications

References 58 publications

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling

Extrusion-based additive manufacturing with cement-based materials – Production steps, processes, and their underlying physics: A review

Optimization of the Stirring Blade Structure of the Pumping Unit Based on the Improvement of Concrete Suction Efficiency

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