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Concrete in large quantities can be pumped across long distances for placing in inaccessible sites. This system comprises a hopper that receives concrete from a mixer, a pump to propel the concrete, and pipelines that facilitate its delivery.
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Simulation Analysis of Concrete Pumping Based on Smooth Particle Hydrodynamics and Discrete Elements Method Coupling.

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This study simulates fresh concrete pumping in confined spaces using SPH-DEM. The research provides a validated model for predicting suction efficiency, crucial for improving pumping operations.

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SPH-DEMconcrete pumpingrheology behavior of fresh concretetest validating

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Area of Science:

  • Civil Engineering
  • Material Science
  • Fluid Dynamics

Background:

  • Pumping fresh concrete in confined spaces can disrupt laminar flow due to return flow and gravity.
  • This phenomenon, impacting suction efficiency, is understudied in existing research.
  • Accurate simulation of concrete flow is essential for optimizing pumping processes.

Purpose of the Study:

  • To investigate the flow state, velocity, and suction efficiency of fresh concrete pumping.
  • To develop and validate a numerical model for simulating concrete pumping in confined spaces.
  • To analyze the impact of rheological properties on pumping performance.

Main Methods:

  • Employed a coupled Smooth Particle Hydrodynamics and Discrete Elements Method (SPH-DEM) for numerical simulation.
  • Utilized the Herschel-Bulkley-Papanastasiou (HBP) rheological model to represent fresh concrete behavior.
  • Validated the HBP model against slump test results, showing negligible error.

Main Results:

  • The SPH-DEM model accurately simulated fresh concrete flow, velocity, and suction efficiency.
  • The numerical simulation results showed less than 10% error when compared to experimental data.
  • The HBP model demonstrated high accuracy in predicting concrete rheology for pumping simulations.

Conclusions:

  • The developed SPH-DEM model, incorporating the HBP rheological model, is effective for simulating fresh concrete pumping.
  • The study provides a reliable method for predicting suction efficiency, aiding in the optimization of concrete pumping operations.
  • Experimental validation confirms the accuracy and applicability of the numerical simulation approach.