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Transition Zone

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The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
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Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
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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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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Hyperuniformity classes of quasiperiodic tilings via diffusion spreadability.

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Spreadability effectively measures the hyperuniformity scaling exponent (α) in quasiperiodic systems by analyzing point patterns. This method accurately determines α for various structures, including the Penrose tiling.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Hyperuniform point patterns are characterized by a scaling exponent α, describing the structure factor's behavior near the origin.
  • Extracting α is challenging in quasiperiodic systems due to discontinuous structure factors and Bragg peaks.

Purpose of the Study:

  • To introduce and validate spreadability as a method for determining the hyperuniformity scaling exponent α in quasiperiodic and limit-periodic systems.
  • To transform point patterns into two-phase media for analysis.

Main Methods:

  • Mapping quasiperiodic and limit-periodic point patterns onto packings of nonoverlapping disks.
  • Computing the spectral density χ̃_V(k) of these disk packings.
  • Analyzing the long-time behavior of excess spreadability S(∞)-S(t) to extract α.

Main Results:

  • Spreadability accurately determined α for 1D limit-periodic (α=1) and Fibonacci (α=3) chains within 0.02% of exact values.
  • Obtained α=5.97±0.06 for the 2D Penrose tiling, with strong evidence suggesting α=6.
  • Demonstrated that truncating small-k scattering data yields accurate α for self-similar structures.

Conclusions:

  • Spreadability offers a simple, general, and accurate method for characterizing large-scale translational order in self-similar quasiperiodic and limit-periodic media.
  • The scattering information derived can estimate physical properties like effective dielectric and elastic constants, and fluid permeabilities.