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相关概念视频

Pozzolans01:21

Pozzolans

117
Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
117
Concrete01:20

Concrete

355
Concrete is a vital construction material extensively used worldwide, primarily valued for its strength, durability, and versatility, which it provides for various structural designs. Concrete generally comprises ingredients like Portland cement, coarse gravel, fine sand, and water. Concrete can be mixed by simple hand methods or industrially at computer-controlled plants. The mixture consists of aggregates and a paste made from water and Portland cement. This paste coats the aggregates and,...
355
Impact Strength of Concrete01:21

Impact Strength of Concrete

214
Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
214
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

83
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.
83
Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

89
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...
89
Types of Cement II01:22

Types of Cement II

110
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
110

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相关实验视频

Updated: Jul 10, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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这座是飞灰建造的.

Amy Montgomery1, Mahipal Kasaniya2, Pengfei Zhao1

  • 1Department of Civil & Mineral Engineering, University of Toronto, Toronto, Ontario, Canada.

Journal of microscopy
|November 21, 2023
PubMed
概括
此摘要是机器生成的。

混凝土中的飞灰显著阻止了和聚合物反应,这是混凝土退化的常见原因. 这项研究检查了Hungry Horse大的混凝土,揭示了飞灰.

关键词:
和聚合物反应 (AAR)混凝土混凝土混凝土是什么飞行灰飞行灰是什么意思石岩学 石岩学 是一种石岩学.积分计数点数点数点数点数点数点数点数点数点数点数点数点.波佐兰 (Pozzolan) 是一个波佐兰人.扫描电子显微镜 (SEM) 扫描电子显微镜

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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 材料科学 材料科学 材料科学
  • 地质地质地质地质地质地

背景情况:

  • 饥饿的马大,建于1949年,是第一个在混凝土中使用燃煤飞灰的.
  • 在Hungry Horse之前,北美大中Pozzolan水泥是常见的,但飞灰是新奇的.
  • 的位置将其与煤炭发电的兴起和当前的气候变化问题联系起来.

研究的目的:

  • 调查飞灰在抑制聚合物反应 (AAR) 的长期有效性.
  • 通过显微镜比较来自Hungry Horse大的飞灰和没有飞灰的混凝土核心.

主要方法:

  • 微观检查来自Hungry Horse大的两个混凝土核心.
  • 一个核心含有燃煤飞灰;另一个没有.
  • 分析的重点是砂岩粗聚合物和聚合物反应的迹象.

主要成果:

  • 没有飞灰的混凝土核心显示了沙石聚合物中AAR的明显证据.
  • 核心的砂岩聚合物与飞没有出现AAR的迹象.
  • 对AAR的微观分析显示,酸凝填充了沙粒之间的空隙.

结论:

  • 煤灰在长期内有效地抑制了混凝土中的-二氧化反应.
  • 飞灰的存在可以防止有害的酸凝的形成.
  • 这一发现凸显了在混凝土建筑中使用飞灰的耐久性好处.