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Related Concept Videos

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...
204
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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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

326
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
326
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

267
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
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Permeability of Concrete01:25

Permeability of Concrete

212
Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
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Updated: Sep 7, 2025

Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction
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Microstructural Origin of Propagating Compaction Patterns in Porous Media.

Lars Blatny1, Paul Berclaz1, François Guillard2

  • 1School of Architecture, Civil and Environmental Engineering, Swiss Federal Institute of Technology, Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Physical Review Letters
|June 17, 2022
PubMed
Summary
This summary is machine-generated.

Compaction patterns in porous materials like rocks and snow arise from a universal pore collapse process. Material strength and loading rate determine diverse compaction behaviors, unifying disparate observations.

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Area of Science:

  • Geophysics
  • Materials Science
  • Physics of Complex Systems

Background:

  • Diverse porous materials (rocks, foams, cereals, snow) exhibit common compaction patterns, such as propagating or stationary bands.
  • The origins of these patterns are debated, with current models relying on material-specific empirical laws.

Purpose of the Study:

  • To identify a universal mechanism underlying diverse compaction patterns in porous materials.
  • To develop a unified model applicable across different structured porous geometries.

Main Methods:

  • Development of a generic model for inelastic structured porous geometries.
  • Analysis of pore collapse dynamics within this generalized framework.

Main Results:

  • Demonstration that a universal process of pore collapse drives the observed compaction patterns.
  • Identification of two dimensionless numbers (material strength and loading rate) that map the diversity of observed patterns.
  • Mapping of pattern diversity within a phase space defined by these two dimensionless numbers.

Conclusions:

  • Compaction patterns in porous materials are governed by a universal pore collapse mechanism, not material-specific processes.
  • The observed diversity in patterns can be systematically explained and predicted using a simple phase space based on material strength and loading rate.