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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...
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Expansion and Contraction in Masonry Walls01:19

Expansion and Contraction in Masonry Walls

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Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
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Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

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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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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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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.
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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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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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.
As the concrete specimen fractures under...
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Soil Lysimeter Excavation for Coupled Hydrological, Geochemical, and Microbiological Investigations
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Research progress on expansive soil cracks under changing environment.

Bei-xiao Shi1, Cheng-feng Zheng2, Jin-kun Wu3

  • 1College of Resource, Hebei University of Engineering, Handan, Hebei 056038, China ; Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210024, China.

Thescientificworldjournal
|July 12, 2014
PubMed
Summary
This summary is machine-generated.

Expansive soil cracks, influenced by environmental changes, threaten slope stability. Research is advancing to understand crack development and its impact on soil strength for better engineering solutions.

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Area of Science:

  • Geotechnical Engineering
  • Environmental Science

Background:

  • Engineering challenges related to natural world modifications are emerging.
  • Expansive soil crack development under environmental shifts is a critical factor for slope stability.
  • Expansive soil crack issues are a growing area of research focus.

Purpose of the Study:

  • To elaborate on the occurrence and development of cracks based on expansive soil properties.
  • To highlight the role of crack control in managing expansive soil strength.
  • To summarize current research methods and findings on expansive soil crack characteristics.

Main Methods:

  • Review and synthesis of existing research on expansive soil crack characteristics.
  • Analysis of expansive soil properties influencing crack formation.
  • Examination of the relationship between crack depth and surface features.

Main Results:

  • Expansive soil cracks are a significant factor affecting slope stability.
  • Crack development is intrinsically linked to the basic properties of expansive soils.
  • Controlling cracks is crucial for maintaining expansive soil strength.

Conclusions:

  • Further research is needed to improve crack measurement and calculation methods.
  • Investigating crack depth measurement techniques is essential.
  • Developing advanced statistical analysis methods for crack patterns is a future research direction.
  • Understanding the relationship between crack depth and surface features will enhance predictive capabilities.