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Related Concept Videos

Compacting Factor test01:22

Compacting Factor test

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The compacting factor test is a method used to assess the workability of concrete. It is  especially suitable for concrete mixes containing aggregates up to one and a half inches in size. This test involves specialized equipment consisting of two truncated cone-shaped hoppers and a cylinder, all with polished interior surfaces to minimize friction.
The procedure begins by placing concrete into the upper hopper without any compaction. Once filled, the bottom door of this hopper is opened,...
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Bulk Density of Aggregate01:22

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Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
Most natural mineral aggregates, like sand and gravel,...
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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

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Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
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Moisture Content and Bulking of Aggregate01:10

Moisture Content and Bulking of Aggregate

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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.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
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Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

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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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Related Experiment Video

Updated: May 4, 2026

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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Dynamic compaction of granular materials.

N Favrie1, S Gavrilyuk1

  • 1UMR CNRS 7343, IUSTI , Polytech Marseille, Aix-Marseille University , 5 Rue E. Fermi 13453 Marseille Cedex 13, France.

Proceedings. Mathematical, Physical, and Engineering Sciences
|December 20, 2013
PubMed
Summary

A new thermodynamic model describes granular material compaction, capturing irreversible behavior and hysteresis. This model accurately predicts material response under dynamic and quasi-static loading conditions.

Keywords:
compactiongranular materialshyperbolic equationsmaterial interfacesshock waves

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Area of Science:

  • Multiphase flow modeling
  • Continuum mechanics
  • Materials science

Background:

  • Classical Hertz theory models reversible granular compaction.
  • Understanding irreversible compaction is crucial for material behavior analysis.

Purpose of the Study:

  • Develop an Eulerian hyperbolic multiphase flow model for dynamic and irreversible granular compaction.
  • Ensure thermodynamic consistency and validate against experimental data.

Main Methods:

  • Constructed a reversible model based on Hertz theory.
  • Derived an irreversible model satisfying entropy inequality and Maxwell-type decay of intergranular stress.
  • Incorporated a von Mises-type yield limit dependent on solid volume fraction.

Main Results:

  • The irreversible model exhibits an equilibrium state with a yield limit.
  • Sound velocities are ordered: reversible < yield surface < irreversible.
  • Numerical simulations accurately reproduced experimental hysteresis in loading-unloading cycles.

Conclusions:

  • The proposed model provides a thermodynamically consistent framework for granular material compaction.
  • The model effectively captures dynamic and irreversible behaviors, including hysteresis.
  • Validation against quasi-static experiments confirms the model's accuracy.