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相关概念视频

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

123
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.
123
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

137
The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
137
Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

135
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...
135
Design Example: Aggregate Gradation01:24

Design Example: Aggregate Gradation

151
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...
151
Effects of Air-entrainment in Concrete01:28

Effects of Air-entrainment in Concrete

144
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...
144
Superplasticizers01:30

Superplasticizers

122
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,...
122

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相关实验视频

Updated: Sep 17, 2025

Experimental Protocol to Investigate Particle Aerosolization of a Product Under Abrasion and Under Environmental Weathering
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使用实验设计技术优化用于结构应用的混凝土中纳米材料剂量.

Ratchagaraja Dhairiyasamy1, Deepika Gabiriel2,3, Deekshant Varshney4,5

  • 1Saveetha School of Engineering, Department of Electronics and Communication Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India.

Scientific reports
|July 2, 2025
PubMed
概括

纳米 (NS),纳米 (NA) 和石墨烯氧化物 (GO) 增强了混凝土的强度和耐用性. 石墨烯氧化物 (GO) 显示出最显著的屈曲强度改善,而NS和GO有效地提高了压力强度.

关键词:
这是混凝土混凝土.耐用性 耐用性 耐用性石墨烯氧化物 石墨烯氧化物机械性质 机械性质微观结构的微观结构纳米的使用方法纳米-石是使用的.

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相关实验视频

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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.
  • 纳米技术纳米技术

背景情况:

  • 纳米材料为增强混凝土性能提供了潜力.
  • 在统一条件下,对于纳米 (NS),纳米 (NA) 和石墨烯氧化物 (GO) 存在有限的比较研究.

研究的目的:

  • 实验性地比较NS,NA和GO对混凝土性能的影响.
  • 使用响应表面方法 (RSM) 优化纳米材料剂量,以提高强度和耐久性.

主要方法:

  • 研究了NS (1-3%),NA (1-3%) 和GO (0.05-0.15%) 对混凝土可加工性,强度和耐久性的影响.
  • 采用双因素RSM以基于纳米材料和超塑性剂量的模型和预测机械强度.

主要成果:

  • NS和GO增加了约25%的压力强度;GO在0.10%实现了约40%的屈曲强度改善.
  • 所有纳米修饰混凝土都显示出增强的耐用性 (RCPT,吸水,抗硫酸盐),NS和GO的性能优于NA.
  • RSM将纳米材料剂量确定为主要强度决定因素;超级可塑剂没有显著影响.

结论:

  • 使用NS,NA和GO的定制纳米改造策略可以显著提高混凝土的性能.
  • 确定了每个纳米材料的最佳剂量,以最大限度地提高效益并防止过量服用.
  • 这项研究为设计高性能,耐用的水泥材料提供了宝贵的数据.