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相关概念视频

Superplasticizers01:30

Superplasticizers

105
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
105
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

102
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.
102
Placing Concrete01:17

Placing Concrete

137
The concrete is placed as close as possible to its final position to avoid segregation. The placed concrete is then fully compacted to expel the entrapped air, and the next layer of concrete is laid while the underlying layer is still in the plastic state. The rate at which concrete is placed and compacted is kept equal.
While placing concrete, care is taken to ensure that the concrete is laid in uniform layers, and hand shoveling and moving concrete using poker vibrators is avoided. Also,...
137
Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

112
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...
112
Slump Test01:20

Slump Test

280
The slump test is a widely used method to measure the workability of concrete. It employs a 12-inch high truncated cone mold that tapers from eight inches at the base to four inches at the top. Before testing, the mold is securely attached to a flat base and dampened.
Concrete is poured into the mold in three layers to conduct the test. Each layer is compacted 25 times with a steel tamping rod, which has a five-eighths-inch diameter and a rounded end, to ensure even distribution and eliminate...
280
Factors Affecting Workability01:24

Factors Affecting Workability

93
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
93

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相关实验视频

Updated: Jul 23, 2025

Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
06:27

Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion

Published on: September 12, 2019

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基于多种来源的固体废物软土壤固化材料的性能和固化机制研究.

Keyi Qiu1, Guodong Zeng2, Benan Shu2

  • 1School of Civil Engineering, Foshan University, Foshan 528000, China.

Materials (Basel, Switzerland)
|July 14, 2023
PubMed
概括

这项研究使用多种固体废物开发了一种新的软土壤固化材料. 这种材料有效地提高了土壤的强度,并符合技术要求,为水泥提供了一个可持续的替代品.

科学领域:

  • 地质技术工程 地质技术工程
  • 材料科学 材料科学 材料科学
  • 环境工程 环境工程

背景情况:

  • 软土壤由于强度低,压缩能力高,因此面临工程方面的挑战.
  • 传统的土壤稳定方法通常依赖于水泥,这对环境有缺点.
  • 工业固体废物的利用对可持续发展至关重要.

研究的目的:

  • 开发一种多源固体废物材料,用于软土壤固化.
  • 为了评估这种材料在改善软土壤特性方面的有效性.
  • 评估固体废物作为土壤稳定中的水泥替代品的潜力.

主要方法:

  • 作为原材料,使用了地面颗粒高炉渣,钢铁渣,红泥,废陶粉和脱硫石膏.
  • 测试了三种比率,强度活动指数确定了固体废物分量.
  • 矿物学和微观结构的表征采用了X射线衍射 (XRD),扫描电子显微镜 (SEM) 和热重力学分析-差异扫描热度计 (TG&DSC).

主要成果:

  • 稳定软土壤的不受限制的压力强度随着固化剂含量增加而增加.
  • 故障应变减少,表明从塑料到脆性故障的转变.
  • 在28天内,17%的最佳固化剂含量产生了3.16MPa (沙土),2.05MPa (泥土) 和1.04MPa (有机粘土) 的不受限制的压力强度.
关键词:
柔软的土壤 柔软的土壤固体废弃物 固体废弃物固化的机制是固化的机制.不受限制的压力强度.

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结论:

  • 开发的多源固体废物材料显著提高了软土壤的强度.
  • 该材料符合水泥土混合堆的技术要求.
  • 这项研究表明,使用各种固体废物作为土壤稳定水泥的可持续替代品的可行性.