伊利特在不同附加负荷下对地下土壤机械性能的影响
1University of Engineering & Technology, Taxila, Pakistan.
Heliyon
|May 3, 2024
概括
基层土壤中的伊利特矿物质改善了加利福尼亚的承载比率 (CBR) 和弹性模量 (MR),同时减少了膨胀潜力. 较高的Illite含量与不同附加负载下土壤性能更好相关.
科学领域:
- 地质技术工程 地质技术工程
- 矿物学是什么?矿物学是什么?
- 土壤力学 土壤力学
背景情况:
- 底层土壤的特性对路面的性能有很大影响.
- 伊利特是一种粘土矿物质,以其不扩张的特性而闻名.
- 了解矿物学对土壤力学影响对于基础设施开发至关重要.
研究的目的:
- 研究伊利特含量对地下土壤特性的影响,特别是加利福尼亚承载率 (CBR),弹性模量 (MR) 和膨胀潜力.
- 分析Illite百分比与不同附加负载下的土壤性能之间的相关性.
- 根据CBR开发一个改进的模型来预测MR.
主要方法:
- 使用X射线衍光仪进行矿物学分析.
- 使用超声波脉冲速度 (UPV) 技术评估MR.
- 在六种不同的附加负载 (2.27至13.8公斤) 下测试具有不同Illite含量的土壤样本.
主要成果:
- 在Illite百分比和CBR和MR值之间观察到正相关性.
- 与含有较高伊利特的土壤相比,含有较高蒙莫里隆的土壤表现出较高的CBR和MR值.
- 膨胀潜力随着强硬和弱弱分层土壤的伊利特百分比增加而减少.
- 随着充电负载的增加,CBR和MR值显著增加.
结论:
- 伊利特含量是提高底层土壤性能的一个关键因素.
- 伊利特的存在可以减轻膨胀潜力,提高承载能力.
- 开发CBR和MR之间的关系为路面设计提供了有价值的工具.
相关概念视频
Sieve Analysis and Grading Curves
342
Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
342
Unsoundness of Aggregate due to Volume Change
106
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...
106
Deleterious Substances in Aggregate
166
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...
Another type of impurity is clay and fine material that...
166
Design Example: Aggregate Gradation
93
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
93
Types of Aggregate Grading
490
Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
490
Design Example: Managing Concrete Workability
80
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.
80


