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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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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 moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
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Coarsening and slow dynamics in granular compaction.

A Baldassarri1, S Krishnamurthy, V Loreto

  • 1INFM UdR Camerino, Università di Camerino, Via Madonna delle Carceri I-62032 Camerino, Italy.

Physical Review Letters
|December 12, 2001
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Summary

This study reveals how granular materials reorganize during compaction using Tetris-like models. Compaction involves domain coarsening and boundary reduction, leading to slow dynamics in active walker models.

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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Granular media exhibit complex behavior under external forces.
  • Understanding microscopic reorganization is key to predicting macroscopic properties.
  • Tetris-like models offer a simplified framework for studying granular dynamics.

Purpose of the Study:

  • To investigate the microscopic reorganization of granular media during compaction.
  • To identify and characterize spatial organization regions (domains) and their evolution.
  • To link compaction dynamics to domain coarsening and slow dynamics.

Main Methods:

  • Utilizing Tetris-like models to simulate granular compaction.
  • Analyzing the time evolution of spatial organization domains.
  • Investigating activity concentration at domain boundaries.
  • Exploring the connection between coarsening processes and active walker models.

Main Results:

  • Identified distinct spatial organization domains within the granular medium.
  • Observed that system activity concentrates on domain boundaries after an initial transient.
  • Characterized compaction as a domain coarsening process with decreasing boundary regions.
  • Established a link between domain coarsening and slow dynamics in active walker models.

Conclusions:

  • Compaction in granular media is driven by domain coarsening and boundary reduction.
  • Domain boundary dynamics are crucial for understanding the slow dynamics of granular systems.
  • Tetris-like models provide valuable insights into the microscopic reorganization of granular media.