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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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Compression-driven jamming in porous cohesive aggregates.

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Area of Science:

  • Physics
  • Materials Science
  • Computational Modeling

Background:

  • Understanding the mechanical properties of disordered materials is crucial.
  • Porous aggregates exhibit complex behaviors under compression.
  • Aggregate morphology influences macroscopic properties.

Purpose of the Study:

  • To investigate compression-driven jamming in 2D porous aggregates.
  • To determine the influence of aggregate morphology on jamming behavior.
  • To characterize the pressure-packing fraction relationship and elastic properties.

Main Methods:

  • Distinct-element-method (DEM) simulations were employed.
  • Aggregates were prepared using reaction-limited aggregation (RLA), ballistic particle-cluster aggregation (BPCA), and diffusion-limited aggregation (DLA).
  • Simulations involved a shrinking circular boundary to induce compression.

Main Results:

  • A clear jamming transition was observed for denser RLA and BPCA aggregates.
  • The jamming threshold (ϕJ) varied with aggregate type: RLA (0.765 ± 0.004), BPCA (0.727 ± 0.004), and DLA (0.602 ± 0.023).
  • Pressure above jamming followed P ≈ A(ϕ - ϕJ)², indicating bulk modulus K ∝ (ϕ - ϕJ).

Conclusions:

  • Aggregate morphology critically affects compression-driven jamming.
  • The elastic response of jammed aggregates resembles random spring networks.
  • The study provides insights into the mechanical behavior of cohesive granular materials.