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相关概念视频

Microcracking in Concrete01:20

Microcracking in Concrete

116
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...
116
Design Example: Joints in Concrete Pavements01:28

Design Example: Joints in Concrete Pavements

181
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...
181
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

146
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.
146
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

116
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...
116
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

125
Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
One such test is the revolving disc test, where three plates...
125

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相关实验视频

Updated: Jun 25, 2025

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
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改进了U-net网络青路面裂检测方法.

Qiong Zhang1,2, Shanshan Chen1, Yue Wu1

  • 1Changchun University of Science and Technology, Changchun, Jilin, China.

PloS one
|May 31, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种改进的U-Net网络,用于增强路面裂检测. 新方法显著提高了识别道路裂的准确性,特别是狭窄的裂,提高了道路安全.

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科学领域:

  • 计算机视觉 计算机视觉
  • 人工智能的人工智能
  • 道路工程 道路工程是道路工程.

背景情况:

  • 道路裂检测对于道路安全至关重要.
  • 基本的U-Net模型难以准确地对路面裂进行细分,特别是对于狭窄的裂和复杂的背景.

研究的目的:

  • 建议改进U-Net网络,以便更准确地对路面裂进行细分.
  • 为了提高狭窄裂的识别,提高整体细分精度.

主要方法:

  • 集成的VGG16和上采样卷积 (Up_Conv) 模块.
  • 使用了区块深度可分离的卷积和通道注意力 (Ca) 机制.
  • 在解码路径中集成的深度GSConv Convolution (DG_Conv) 和UnetUp模块.

主要成果:

  • 与传统的U-Net相比,F1得分增加了13.6%,Union (mIoU) 的平均交叉点增加了9.9%.
  • 在U-Net,Segnet和Linknet上表现出卓越的准确性和概括能力.
  • 在CFD和Deepcrack数据集上成功检测了复杂背景中的裂.

结论:

  • 改进的U-Net模型为青路面裂检测提供了一种新且有效的方法.
  • 该模型显示出在道路维护和地面部署方面具有很高的实际应用潜力.