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Related Concept Videos

Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

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Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
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Hydration of Cement01:24

Hydration of Cement

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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Sulfate Attack on Concrete01:29

Sulfate Attack on Concrete

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Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
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Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

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Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
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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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Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

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The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
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Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
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Enhancing aeolian sand stability using microbially induced calcite precipitation technology.

Jingyuan Yin1, Weiqing Qu2, Zumureti Yibulayimu3

  • 1College of Life and Geographic Sciences, Kashi University, Kashi city, China.

Scientific Reports
|October 12, 2024
PubMed
Summary

Microbially Induced Calcite Precipitation (MICP) effectively stabilizes desert sand against wind erosion. This eco-friendly method enhances soil strength and reduces pollution risks, showing great potential for arid environments.

Keywords:
Aeolian sand stabilityErosion resistanceMicrobially Induced Calcite Precipitation (MICP)Structural stability

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Area of Science:

  • Geotechnical Engineering
  • Environmental Science
  • Microbiology

Background:

  • Aeolian sand poses significant challenges in arid regions due to instability and erosion.
  • Traditional soil stabilization methods can be environmentally detrimental.
  • Microbially Induced Calcite Precipitation (MICP) offers a novel, eco-friendly approach to soil improvement.

Purpose of the Study:

  • To evaluate the efficacy of MICP in enhancing the structural stability and erosion resistance of aeolian sand.
  • To assess the impact of MICP treatment duration on soil properties.
  • To investigate the micro-mechanisms of soil stabilization by MICP and its environmental implications.

Main Methods:

  • MICP treatment was applied to desert sand samples from Kashi, Xinjiang.
  • Wind erosion tests were conducted to assess soil stability and erosion resistance.
  • Scanning Electron Microscopy (SEM) was used to analyze particle bonding and calcite formation.
  • Environmental impact assessments were performed to evaluate pollution risks.

Main Results:

  • MICP treatment significantly improved the structural stability and wind erosion resistance of aeolian sand.
  • Optimal results were observed after 14 days of MICP treatment, showing enhanced surface crust strength.
  • SEM analysis confirmed that precipitated calcite formed bridges between soil particles, increasing inter-particle bonding and penetration strength.
  • Environmental assessments indicated the technology is eco-friendly and reduces soil pollution risks.

Conclusions:

  • MICP technology is a viable and effective method for stabilizing aeolian sand.
  • The study validates the potential of MICP for improving soil stability and environmental adaptability in arid regions.
  • MICP offers a sustainable solution for mitigating wind erosion and related environmental issues.