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相关概念视频

Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

153
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...
153
Hydration of Cement01:24

Hydration of Cement

201
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...
201
Sulfate Attack on Concrete01:29

Sulfate Attack on Concrete

115
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...
115
Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

178
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.
Concrete in areas between tide marks,...
178
Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

80
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...
80
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

88
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...
88

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Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
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使用微生物诱导的石沉技术增强岩沙的稳定性.

Jingyuan Yin1, Weiqing Qu2, Zumureti Yibulayimu3

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

Scientific reports
|October 12, 2024
PubMed
概括

微生物诱导的石沉 (MICP) 有效地稳定了沙漠沙子,防止风侵蚀. 这种环保方法提高了土壤的强度,降低了污染风险,显示了干旱环境的巨大潜力.

关键词:
埃奥里亚风沙的稳定性 埃奥里亚风沙的稳定性耐侵蚀性 耐侵蚀性 耐侵蚀性微生物诱导的石沉 (MICP)结构稳定性 结构稳定性

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科学领域:

  • 地质技术工程 地质技术工程
  • 环境科学 环境科学
  • 微生物学 微生物学

背景情况:

  • 在干旱地区,由于不稳定性和侵蚀,岩沙带来了重大挑战.
  • 传统的土壤稳定方法可能对环境有害.
  • 微生物诱导的石沉 (MICP) 为改善土壤提供了一种新的,环保的方法.

研究的目的:

  • 评估MICP在提高岩沙的结构稳定性和耐侵蚀性方面的有效性.
  • 评估MICP处理时间对土壤特性的影响.
  • 通过MICP研究土壤稳定的微机制及其对环境的影响.

主要方法:

  • 在Kashi,新疆的沙漠沙子样本上进行了MICP处理.
  • 进行了风侵蚀测试,以评估土壤的稳定性和耐侵蚀性.
  • 扫描电子显微镜 (SEM) 用于分析粒子结合和石形成.
  • 为了评估污染风险,进行了环境影响评估.

主要成果:

  • MICP处理显著改善了岩沙的结构稳定性和抗风侵蚀性.
  • 经过14天的MICP治疗后,观察到最优的结果,显示表面地强度提高.
  • SEM分析证实,沉的石在土壤颗粒之间形成了桥梁,增加了颗粒之间的结合和透强度.
  • 环境评估表明,该技术是环保的,并减少了土壤污染的风险.

结论:

  • MICP技术是一种可行且有效的方法,可以稳定地稳定地稳定地稳定地稳定地稳定地稳定地稳定.
  • 该研究验证了MICP在改善干旱地区土壤稳定性和环境适应性方面的潜力.
  • MICP为减轻风力侵蚀和相关环境问题提供了可持续的解决方案.