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相关概念视频

Segregation in Fresh Concrete01:16

Segregation in Fresh Concrete

140
Segregation in fresh concrete is a phenomenon where the components of the concrete mix separate, leading to uneven distribution and compromised structural integrity. This separation typically occurs when concrete is subjected to excessive horizontal movement within forms, or when it is dropped from considerable heights or forced through narrow, winding paths. As a result, heavier coarse aggregate particles settle at the bottom, while lighter, finer materials such as cement and water rise to the...
140
Placing Concrete01:17

Placing Concrete

106
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,...
106
Bleeding in Fresh Concrete01:22

Bleeding in Fresh Concrete

127
Bleeding in fresh concrete occurs when water from the mix rises to the surface. This happens because the mix's solid components fail to retain all the water as they settle, leading to separation where water collects at the top. The severity of bleeding can be measured by assessing the total settlement or by noting the decrease in height per unit height of concrete.
Bleeding can cause several issues in the concrete structure. Sometimes, the rising water gets trapped beneath large aggregate...
127
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

121
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
121
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

161
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
161

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Author Spotlight: Efficient Image Recognition Using Directional Gradient Histogram Technique and Support Vector Machines
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基于深度学习的具体缺陷分类和检测使用语义细分的语义细分.

Palisa Arafin1, Ahm Muntasir Billah2, Anas Issa3

  • 1Department of Civil Engineering, Lakehead University, Thunder Bay, ON, Canada.

Structural health monitoring
|December 11, 2023
PubMed
概括
此摘要是机器生成的。

本研究引入了一个新的数据集和深度学习模型,用于在结构健康监测中检测混凝土裂和裂纹. 基于EfficientNetB3的U-Net在裂纹细分方面获得了95.66%的F1分数.

关键词:
混凝土的缺陷 混凝土的缺陷卷积神经网络是一种卷积神经网络.编码器-解码器模型语义细分 语义细分 语义细分 语义细分结构健康监测 结构健康监测

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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 计算机科学 计算机科学
  • 人工智能的人工智能

背景情况:

  • 深度学习 (DL) 在结构健康监测 (SHM) 中提供了准确,客观的基础设施损害检测的潜力.
  • 主要挑战包括有限的缺陷图像数据集和为实时应用选择合适的DL网络架构.

研究的目的:

  • 开发和评估用于使用新型数据集检测混凝土裂和裂纹的DL模型.
  • 为了解决现有的缺陷图像数据库和DL网络深度选择的局限性.

主要方法:

  • 创建了4087个混凝土裂和1100个裂变图像的多样化数据集.
  • 卷积神经网络 (CNN) 分类器 (VGG19,ResNet50,InceptionV3) 用于缺陷的识别.
  • 编码-解码模型 (U-Net,PSPNet) 与各种骨干 (VGG19,ResNet50,InceptionV3,EfficientNetB3) 已被开发用于语义细分.

主要成果:

  • InceptionV3通过RMSprop优化器实现了91.98%的缺陷分类准确度.
  • 基于EfficientNetB3的U-Net产生了最好的裂细分 (95.66% F1得分).
  • 基于InceptionV3的U-Net在分割细分方面表现出色 (89.43%的F1得分).

结论:

  • 开发的DL模型和数据集在SHM中显著提升了自动视觉损伤检测.
  • 特定的CNN架构在混凝土缺陷的分类和细分方面都表现出高效.
  • 这项研究为更准确和更容易获得的实时结构性健康监测系统提供了基础.