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Frost Action on Concrete01:27

Frost Action on Concrete

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Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
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Unsoundness of Aggregate due to Volume Change01:26

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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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Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
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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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Simulating Impacts of Ice Storms on Forest Ecosystems
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Damage due to ice crystallization.

Menno Demmenie1,2, Paul Kolpakov3, Boaz van Casteren3

  • 1Van der Waals-Zeeman institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands. M.Demmenie@uva.nl.

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|January 17, 2025
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Summary
This summary is machine-generated.

Water freezing causes material damage, even when not fully saturated. This study reveals that liquid inclusions forming during freezing lead to high pressures and fractures, but changing surface wettability can prevent this damage.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Physical Chemistry

Background:

  • Water freezing is a primary cause of mechanical damage in materials during cold conditions.
  • Damage occurs even in partially saturated materials where ice has space to grow.

Purpose of the Study:

  • To investigate the mechanisms of mechanical damage caused by water freezing in partially saturated media.
  • To identify the conditions leading to fracture and explore methods to prevent it.

Main Methods:

  • Freezing experiments were conducted in cylindrical glass vials with varying sizes and wettability.
  • A dye was used to visualize the freezing front and liquid inclusions.
  • Thermodynamic principles were applied to quantify the crystallization pressure.

Main Results:

  • Mechanical damage occurs when closed liquid inclusions form within ice due to air/water meniscus freezing.
  • Subsequent freezing of these inclusions causes significant volume expansion, leading to high pressures and fractures.
  • Crystallization pressure on the inclusion boundary is independent of the liquid pocket's volume.

Conclusions:

  • Liquid inclusions formed during freezing are the primary cause of mechanical damage in partially saturated materials.
  • Surface wettability can be modified to prevent the formation of damaging liquid pockets.
  • Understanding these freezing dynamics is crucial for material durability in winter environments.