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Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

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Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
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Microcracking in Concrete01:20

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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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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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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.
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Universality classes in constrained crack growth.

Knut S Gjerden1, Arne Stormo, Alex Hansen

  • 1Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.

Physical Review Letters
|October 15, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals crack front motion exhibits two distinct behaviors. At large scales, it follows the pinned elastic line model, while smaller scales show hole coalescence, aligning with percolation theory.

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Area of Science:

  • Materials Science
  • Physics
  • Fracture Mechanics

Background:

  • Understanding crack propagation is crucial for material integrity.
  • Previous models often simplify crack front dynamics.

Purpose of the Study:

  • To numerically investigate crack front motion through a weak plane.
  • To identify distinct regimes and universality classes governing crack propagation.

Main Methods:

  • Extension of the fiber bundle model for numerical simulation.
  • Analysis of crack front motion at varying scales.

Main Results:

  • Two regimes identified: large-scale pinned elastic line behavior (roughness exponent 0.39±0.04) and small-scale hole coalescence (roughness exponent 2/3).
  • Crack front length is fractal at small scales with a dimension of 1.77±0.02, consistent with percolation cluster hulls.

Conclusions:

  • Crack front motion is described by two universality classes: pinned elastic line at large scales and percolation at small scales.
  • This dual-class description offers a more comprehensive understanding of fracture mechanics.