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Related Concept Videos

Pumped Concrete01:13

Pumped Concrete

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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.
For direct-acting pumps, the concrete enters the pump via the inlet valve under the action of gravity and suction created by the movement of the piston. This concrete is then forced into the pipeline and out through the outlet valve by the forward movement...
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Behavior of Concrete Under Compressive Load01:23

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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
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Classification of Elements and Compounds02:54

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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
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Numerical Calculations01:24

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In engineering applications, the representation of the numerical value is critical. Presenting or reporting the answer is one of the essential parts of engineering practices. Numerical calculations are performed using handheld calculators or computers since numerically accurate answers are always preferred.
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Elements and Compounds01:27

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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Updated: Jan 25, 2026

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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Numerical Study on Concrete Pumping Behavior via Local Flow Simulation with Discrete Element Method.

Yijian Zhan1, Jian Gong2, Yulin Huang3

  • 1General Engineering Institute of Shanghai Construction Group, Shanghai Construction Group Co., Ltd., Shanghai 200080, China. zhanyj@scgtc.com.cn.

Materials (Basel, Switzerland)
|May 5, 2019
PubMed
Summary
This summary is machine-generated.

Self-consolidating concrete pumping in super high-rise buildings faces risks. Discrete element method simulations reveal how pipe and aggregate geometry, and pumping conditions affect concrete flow and pumpability.

Keywords:
discrete element methodlocal flow behaviorparametric studypumpabilityself-consolidating concrete

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Computational Mechanics

Background:

  • Super high-rise buildings utilize self-consolidating concrete (SCC) and advanced pumping systems.
  • Pipeline clogging and bursting are significant risks during concrete pumping.
  • Detailed understanding of fresh concrete pumping mechanisms is crucial for safety and efficiency.

Purpose of the Study:

  • To investigate the mechanisms of fresh concrete pumping in pipelines.
  • To analyze the influence of various parameters on local pumping performance.
  • To evaluate the effectiveness of discrete element method (DEM) simulations for assessing concrete pumpability.

Main Methods:

  • Numerical simulation using the discrete element method (DEM).
  • Modeling coarse aggregates as rigid clumps with defined contact models.
  • Simulation of concrete flow within representative pipeline units under various conditions.

Main Results:

  • DEM simulations successfully revealed concrete flow patterns in pipeline units.
  • Parametric studies identified key factors influencing local pumping performance, including pipe geometry, aggregate geometry, and pumping conditions.
  • The impact of these factors on pumpability was systematically summarized.

Conclusions:

  • Discrete element simulation is a valuable tool for analyzing fresh concrete pumping.
  • The study provides insights into optimizing pumping processes for self-consolidating concrete.
  • DEM simulations can help mitigate risks associated with pumping in super high-rise construction.