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相关概念视频

Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

95
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
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Types of Cement I01:21

Types of Cement I

120
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
120
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

93
Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
The...
93
Masonry Paving01:21

Masonry Paving

255
The construction of masonry paving involves using materials such as bricks, stones, and concrete masonry units. These materials are chosen for their shape, color, strength, and resistance to abrasion and weathering. Masonry units can be installed dry on a thin layer of sand and a gravel base, or they can be embedded in mortar or asphalt on a concrete slab. For areas subjected to heavy vehicular loads, a rigid base layer of reinforced or unreinforced concrete is recommended. In contrast,...
255
Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

182
Concrete pavement joints are essential for maintaining the structural integrity and longevity of pavement by controlling where and how the pavement cracks. These joints can be categorized based on their functions, such as contraction or control joints, construction joints, isolation joints, and expansion joints.
Contraction joints are typically formed by sawing a groove into the concrete shortly after it has hardened. This creates a weakened vertical plane, deliberately encouraging cracking at...
182
Types of Cement II01:22

Types of Cement II

107
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...
107

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一种多功能混凝土复合材料,用于铺路地板下层.

Mohammad Jawed Roshan1, Mohammadmahdi Abedi1, António Gomes Correia1

  • 1Department of Civil Engineering, ISISE, ARISE, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.

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概括

这项研究开发了一种自我感应的水泥复合材料,用于智能化下层层. 复合材料有效监测压力,应变和损坏,增强运输基础设施的健康.

关键词:
在 MWCNT/GNP 中.检测损坏检测损坏的检测.电化学阻抗光谱学 (EIS) 是一种弹性模块的弹性模块是自觉感应的混凝土复合材料压力/应变感应器

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科学领域:

  • 材料科学 材料科学 材料科学
  • 土木工程 土木工程是指土木工程.
  • 智能结构是一个智能结构.

背景情况:

  • 交通基础设施层的过早故障和退化带来了重大挑战.
  • 结构健康监测 (SHM) 对于路面施工层来说至关重要,以解决这些问题.

研究的目的:

  • 研究一种新型自我感应的水泥复合材料的应力/应变感应和损伤检测能力.
  • 评估复合材料在智能分层层中使用的潜力.

主要方法:

  • 使用水泥,多壁碳纳米管 (MWCNTs) 和石墨烯纳米板 (GNPs) 制造一种自我感应的水泥复合材料.
  • 压电阻分析以评估应力/应变感应性能.
  • 电化学阻抗光谱 (EIS) 用于损伤检测.
  • 扫描电子显微镜 (SEM) 用于微观结构分析.

主要成果:

  • 电阻对MWCNT/GNP度敏感,响应性需要>0.5%.
  • 增加的MWCNT/GNP度和压力水平提高了压力/应变感应性能.
  • 电阻的分数变化 (FCR) 与弹性模量相关,表明刚度的变化.
  • EIS分析显示,在材料故障之前和之后,尼奎斯特的地块发生了明显的变化.
  • SEM图像显示了复合材料中的MWCNT桥接和GNP填充效应.

结论:

  • 开发的自我感应的水泥复合材料展示了SHM在路面施工中的有前途能力.
  • 复合材料的压电阻和电化学特性可以有效地监测结构完整性和损坏.
  • 这种智能次级材料为改善运输基础设施的耐用性和降低运输基础设施维护成本提供了途径.