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相关概念视频

Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

219
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...
219
Microcracking in Concrete01:20

Microcracking in Concrete

151
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
151
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

191
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.
191
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

116
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...
116
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

147
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...
147
Masonry Paving01:21

Masonry Paving

273
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,...
273

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相关实验视频

Updated: Jul 23, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

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基于点云数据和数据融合的路面裂检测.

Qiao Dong1, Sike Wang1, Xueqin Chen2

  • 1Department of Roadway Engineering, School of Transportation, Southeast University, Nanjing 211189, People's Republic of China.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
|July 16, 2023
PubMed
概括
此摘要是机器生成的。

研究人员开发了两种人工智能方法来检测3D点云数据中的路面裂. 一个使用RANSAC改进的滑动窗口算法进行提取,而另一个使用YOLOv5从转换的图像进行检测.

关键词:
这就是Yolov5的意义.青路面是一种青路面.裂纹检测 裂纹检测 裂纹检测深度学习是一种深度学习.一个点云,一个点云.

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相关实验视频

Last Updated: Jul 23, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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科学领域:

  • 土木工程 土木工程是指土木工程.
  • 计算机视觉 计算机视觉
  • 人工智能的人工智能

背景情况:

  • 路面裂检测对于基础设施维护至关重要.
  • 准确识别和描述裂是关键的挑战.
  • 3D点云数据为路面分析提供了丰富的信息.

研究的目的:

  • 开发和评估使用点云数据进行3D路面裂检测的新方法.
  • 为了提取裂纹信息,包括位置和大小.
  • 在运输基础设施分析中推进人工智能应用.

主要方法:

  • 开发了一种改进的滑动窗口算法,与随机样本共识 (RANSAC) 结合,用于从点云直接提取裂纹.
  • 实现基于YOLOv5的深度学习模型,用于使用从点云数据中转换的2D图像自动检测路面裂.
  • 研究的融合点云图像与灰度图像作为YOLOv5.5的输入.

主要成果:

  • 改进的滑窗算法有效地提取路面裂,降低噪音.
  • 基于YOLOv5的方法在自动路面裂检测方面表现良好.
  • 图像类型的融合显示了提高检测准确性的潜力.

结论:

  • 两种开发的方法都显示出对3D路面裂分析的前景.
  • 由人工智能驱动的方法为人行道健康监测提供了高效和准确的解决方案.
  • 这项研究有助于人工智能在运输基础设施故障分析领域的发展.