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Types of Non-structural Cracks in Concrete

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.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Published on: January 16, 2019

Avalanches and clusters in planar crack front propagation.

Lasse Laurson1, Stephane Santucci, Stefano Zapperi

  • 1ISI Foundation, Viale S. Severo 65, 10133 Torino, Italy.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 21, 2010
PubMed
Summary

This study models crack propagation avalanches in disordered media, revealing that local clusters follow a power law distribution. A derived scaling relation connects local and global avalanche exponents, explaining experimental crack avalanche data.

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Area of Science:

  • Physics
  • Materials Science
  • Geophysics

Background:

  • Avalanches in disordered systems are complex phenomena.
  • Planar crack propagation involves interactions within a disordered medium.
  • Understanding avalanche dynamics is crucial for various scientific fields.

Purpose of the Study:

  • To investigate avalanche behavior in a model of planar crack propagation.
  • To analyze the formation and size distribution of local clusters in avalanches.
  • To establish scaling relations between local and global avalanche characteristics.

Main Methods:

  • Modeling planar crack propagation in a disordered medium.
  • Analyzing spatially disconnected local clusters within avalanches.
  • Deriving scaling relations between local and global avalanche exponents (tau{a} and tau).
  • Investigating cluster aspect ratio scaling with roughness exponent.

Main Results:

  • Avalanches form spatially disconnected local clusters due to long-range interactions.
  • Local cluster sizes follow a power law distribution with exponent tau{a}=1.5.
  • A scaling relation tau{a}=2tau-1 is derived, linking local and global exponents.
  • Cluster aspect ratio scales with the roughness exponent for larger length scales.

Conclusions:

  • The model explains experimental observations of planar crack avalanches in Plexiglas.
  • The findings are applicable to other systems exhibiting long-range interactions.
  • The study provides insights into the statistical mechanics of fracture and crack propagation.