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Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
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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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Morphology dictated heterogeneous dynamics in two-dimensional aggregates.

Tamoghna Das1, T Lookman2, M M Bandi3

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Particle aggregate structures vary widely due to competing forces. Microscopic mechanisms, like symmetric caging versus asymmetric binding, dictate morphology and influence particle dynamics and diffusivity.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Particulate aggregates exhibit diverse morphologies, from compact to string-like, driven by inter-particle forces.
  • Understanding the link between aggregate structure and dynamics is crucial for materials design.

Purpose of the Study:

  • To identify microscopic mechanisms governing different particulate aggregate morphologies.
  • To investigate the relationship between aggregate microstructure and particle dynamics.

Main Methods:

  • Simulating particle trajectories in two dimensions at fixed density and temperature.
  • Analyzing particle binding and neighbor interactions.
  • Measuring time-dependent diffusivity and structural randomness.

Main Results:

  • Symmetric caging leads to compact clusters; asymmetric binding forms non-compact aggregates.
  • Distinct timescales characterize these microscopic mechanisms.
  • Diffusivity varies with morphology and is generally sub-diffusive at low temperatures.

Conclusions:

  • Microstructure and dynamics of particulate aggregates are intrinsically linked.
  • A generic relation between diffusivity and structural randomness holds for these complex systems.