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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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Major Losses in Pipes01:28

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When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
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Porosity in Cement Paste01:18

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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.
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Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

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Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
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Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

114
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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Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

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Air entrainment in concrete significantly enhances the material's durability, especially in environments subjected to freeze-thaw cycles. Introducing small air bubbles into the concrete mix acts as internal voids that accommodate the expansion of water when it freezes, thereby alleviating internal stress and preventing structural cracks. This function is crucial in climates with significant freezing and thawing, as it protects the concrete from repeated stresses that could lead to premature...
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Related Experiment Video

Updated: Jul 5, 2025

The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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Fault roughness controls injection-induced seismicity.

Lei Wang1, Grzegorz Kwiatek1, François Renard2,3,4

  • 1Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Geomechanics and Scientific Drilling, Potsdam 14473, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|January 12, 2024
PubMed
Summary
This summary is machine-generated.

Fault roughness significantly impacts fluid-induced seismicity by localizing seismic events and altering their characteristics. Understanding these effects is crucial for forecasting potential runaway events during fluid injection operations.

Keywords:
aseismic slipfault roughnessfluid-induced seismicitylaboratory earthquakesstress heterogeneity

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Area of Science:

  • Geophysics
  • Earthquake Science
  • Rock Mechanics

Background:

  • Surface roughness is common in natural faults, influencing tectonic earthquake dynamics.
  • The effect of fault roughness on fluid-induced seismicity is not well understood.

Purpose of the Study:

  • Investigate how fault geometry and stress heterogeneity affect fluid-induced fault slip.
  • Analyze the characteristics of seismicity associated with fluid injection in rough vs. smooth faults.

Main Methods:

  • Laboratory fluid injection experiments on sandstone samples with smooth and rough faults.
  • Numerical modeling to complement experimental findings.

Main Results:

  • Rough faults exhibit slower slip, reduced slip velocities, and lower slip-weakening rates compared to smooth faults.
  • Fault roughness and stress heterogeneity control hypocenter distribution, frequency-magnitude relations, and source mechanisms of induced acoustic emissions (AEs).
  • AEs on rough faults are spatially localized around stressed asperities, showing non-double-couple mechanisms and lower Gutenberg-Richter b-values.

Conclusions:

  • Fault roughness influences the spatial distribution and characteristics of fluid-induced seismicity.
  • Monitoring induced microseismicity can help identify seismic activity localization and forecast hazardous events.