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Updated: Jun 14, 2025

Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
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用中枢神经系统和无凝聚性土壤处理的肥泥的改善

Khalid Farooq1, Hassan Mujtaba2, Syed Zishan Ashiq1

  • 1Civil Engineering Department, University of Engineering & Technology, Lahore, Pakistan.

Scientific reports
|August 29, 2024
PubMed
概括

将有问题的脂肪粘土与凝聚性非膨胀土壤 (CNS) 或泥沙沙土 (Kassu) 混合,可以显著改善其工程性能. CNS在减少膨胀潜力方面更有效,提高了土壤适用于建筑次级的适用性.

关键词:
胀的粘土土加利福尼亚州轴承比率,地质技术灾害.卡苏卡苏 (Kassu Kassu) 是一家在日本建立的公司.膨胀的潜力可能会膨胀.膨胀压力的膨胀压力是什么

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Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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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.
The balance of water to cement in the mix is...
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Hydration of Cement01:24

Hydration of Cement

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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Soundness of Cement

The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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