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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

111
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...
111
Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

179
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...
179
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

132
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.
132
Creep in Concrete01:22

Creep in Concrete

186
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
186
Frost Action on Concrete01:27

Frost Action on Concrete

94
Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
94
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

113
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...
113

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相关实验视频

Updated: Jun 13, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
00:05

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Published on: September 29, 2019

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混动基于注意力的路面密封裂应急检测

Bo Yuan1, Zhaoyun Sun2, Lili Pei1

  • 1School of Data Science and Artificial Intelligence, Chang'an University, Xi'an 710061, China.

Sensors (Basel, Switzerland)
|September 14, 2024
PubMed
概括

一种新的基于注意力的混合方法可以通过使用先进的特征提取和智能交叉对欧盟损失函数来改进路面密封裂纹的检测. 这提高了路面的性能稳定性和准确性.

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:

  • 路面的性能稳定性对于基础设施的寿命至关重要.
  • 准确检测路面密封裂对于及时维护至关重要.
  • 现有的方法可能缺乏复杂裂模式所需的精度.

研究的目的:

  • 引入一种新的基于注意力的混合方法,用于路面密封裂纹检测.
  • 为了提高识别路面裂的准确性和效率.
  • 确保道路基础设施的长期稳定性和性能.

主要方法:

  • 在特征提取和检测网络中集成混合注意模块.
  • 使用具有多尺度特征融合的双向检测头.
  • 在动态梯度调整中使用一个智能交叉点对欧盟损失函数.

主要成果:

  • 获得了98.02%的平均平均精度 (mAP@0.5).
  • 记录了0.9768的回忆和0.9680.1的F1得分.
  • 与现有的一阶段最先进的方法相比,证明了卓越的性能.

结论:

关键词:
应急检测 探测 探测神经网络的神经网络的神经网络路面封闭的裂被路面封闭了.混杂注意力注意力注意力.聪明的十字路口超过工会.

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  • 提出的基于注意力的混合方法显著提高了路面密封裂纹检测的准确性.
  • 在欧盟损失函数上的智能交叉改善了界限框的装配和覆盖范围.
  • 这种方法为保持路面完整性和性能提供了一个有希望的解决方案.