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The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
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Symmetrically periodic segregation in a vertically vibrated binary granular bed.

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This study reveals how air pressure and vibration affect particle segregation in copper-alumina mixtures. Increased air pressure leads to asymmetrical particle heaping during segregation, mimicking volcanic eruptions.

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Area of Science:

  • Granular physics
  • Materials science
  • Complex systems

Background:

  • Granular materials exhibit complex behaviors, including segregation, influenced by external factors.
  • Understanding segregation dynamics is crucial for industrial processes and geophysical phenomena.

Purpose of the Study:

  • To experimentally investigate periodic segregation in copper-alumina mixtures.
  • To analyze the effects of ambient air pressure and vibrational acceleration on segregation patterns.
  • To characterize segregation using an order parameter and relate it to physical models.

Main Methods:

  • Controlled experiments varying air pressure and vibration intensity.
  • Image processing techniques to quantify particle height differences.
  • Analysis of percolation and eruption stages of segregation.

Main Results:

  • Moderate air pressure results in symmetrical heaping profiles during segregation.
  • Increased air pressure leads to asymmetrical heaping, described by the Mogi model.
  • Eruption and percolation times correlate with vibration strength.

Conclusions:

  • Air pressure significantly influences the symmetry of granular segregation.
  • The Mogi model effectively describes the eruption stage of segregation.
  • Vibration strength is a key factor in the dynamics of granular segregation.