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相关概念视频

Aggregates Classification01:29

Aggregates Classification

321
Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
Petrographic classification groups aggregates based on common mineralogical characteristics. Some of the common mineral groups found in aggregates are...
321
Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

108
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...
108
Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

285
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
285
Shape and Texture of Coarse Aggregate01:25

Shape and Texture of Coarse Aggregate

210
Aggregate shape is classified based on the relative sharpness or roundness of the edges and corners. This classification includes categories like rounded, angular, elongated, and flaky, each with specific characteristics. Rounded aggregates, fully shaped by attrition, are typical of river or seashore gravel, while angular aggregates, such as crushed rock, have well-defined edges. Aggregates that are elongated and flaky are less desirable, as they can reduce the workability and strength of...
210
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...
95
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

255
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
255

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相关实验视频

Updated: Jul 1, 2025

Measurement of Aggregate Cohesion by Tissue Surface Tensiometry
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Measurement of Aggregate Cohesion by Tissue Surface Tensiometry

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粘贴,聚合物,还是空气? 这就是问题所在.

Ekaterina Ossetchkina1, Oleksiy Chernoloz1, Lucas Herzog Bromerchenkel2

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

Journal of microscopy
|March 7, 2024
PubMed
概括
此摘要是机器生成的。

戈迪霍威国际桥使用先进的自动化方法来评估混凝土中的空气入,确保耐用性. 本研究展示了一种新的神经网络方法,用于在大型基础设施项目中自动确定粘贴内容.

关键词:
在这里,Python是Python.空气空洞空洞的空气空洞.混凝土混凝土混凝土是什么图像处理是图像处理的过程.机器学习是机器学习.神经网络的神经网络的神经网络

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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
  • 建筑技术 建筑技术 建筑技术

背景情况:

  • 戈迪霍威国际大桥是一个重要的北美基础设施项目,需要耐用混凝土来适应其恶劣的环境.
  • 评估混凝土质量的传统方法,如空气引入,可能是耗时和劳动密集的.

研究的目的:

  • 详细说明ASTM C 457程序C的应用,对比度增强方法用于在戈迪霍威国际桥项目中评估空气空隙.
  • 通过使用手动点数计数和神经网络训练记录的数据,展示一种用于自动化粘贴含量确定的新方法.

主要方法:

  • 采用ASTM C 457程序C,对比度增强方法,用于在硬化混凝土中对空气空隙的自动显微镜分析.
  • 采用数字图像处理来确定空气空隙特征.
  • 在手动点数时记录数字图像坐标和相位识别,以训练神经网络进行自动化粘贴内容分析.

主要成果:

  • 成功地在北美基础设施中大规模应用了自动空气空隙评估.
  • 证明了训练神经网络用于自动化糊含量确定,补充传统方法的可行性.
  • 确保了空气进入混凝土的质量,这对于桥梁在融环境中的耐用性至关重要.

结论:

  • 根据ASTM C 457程序C的空气空隙评估的自动化显微镜方法对大型基础设施有效.
  • 开发的神经网络为自动化粘贴含量确定提供了一个有前途的方法,提高了混凝土建筑的质量控制.
  • 这种综合方法确保了像戈迪霍威国际大桥这样的关键基础设施的长期耐用性.