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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

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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.
The balance of water to cement in the mix is...
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Pore Size Distribution01:23

Pore Size Distribution

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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.
Adequate...
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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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Transition Zone01:28

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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Microcracking in Concrete01:20

Microcracking in Concrete

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Related Experiment Video

Updated: May 27, 2025

Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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Enhanced coarsening induced by pore confinement.

A Salame1, V-T Nguyen1, V Langlois1

  • 1ENPC, Univ Gustave Eiffel, Laboratoire Navier, CNRS.

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Confinement accelerates coarsening in liquid foams, contrary to expectations. This study reveals how pore size and liquid distribution impact particle arrangement and stability in confined systems.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Soft Matter Physics

Background:

  • Coarsening reduces interfacial energy, enlarging particle sizes in two-phase systems.
  • Confined particles can exhibit anticoarsening, leading to one particle per pore.
  • Liquid foams are common in alloys, emulsions, and supersaturated solutions.

Purpose of the Study:

  • To quantitatively investigate liquid foam coarsening dynamics within confined spherical bead packings.
  • To explore how varying bead sizes (confinement degree) affect coarsening.
  • To understand the unexpected acceleration of coarsening under confinement.

Main Methods:

  • Utilizing spherical bead packings to create controlled confinement for liquid foam.
  • Adjusting bead sizes to systematically alter the degree of confinement.
  • Quantitatively analyzing coarsening dynamics and particle size distribution.

Main Results:

  • Increased confinement accelerates foam coarsening, unlike unconfined systems.
  • Broadening of particle size distribution has an opposite effect under confinement.
  • Unexpected behavior stems from the coupling of surface-adsorbed liquid and core liquid fraction.

Conclusions:

  • Confinement's effect on coarsening is complex and depends on pore geometry.
  • Liquid distribution and interfacial phenomena are key drivers of coarsening in confined foams.
  • Findings challenge previous assumptions about anticoarsening in confined systems.