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相关概念视频

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
Microcracking in Concrete01:20

Microcracking in Concrete

122
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...
122
Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

168
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
168
Types of Cement I01:21

Types of Cement I

125
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
125

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Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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固化现场管道缺陷的非破坏性表征

Richard Dvořák1, Luboš Jakubka1, Libor Topolář1

  • 1Institute of Physics, Faculty of Civil Engineering, Brno University of Technology, 60190 Brno-střed, Czech Republic.

Materials (Basel, Switzerland)
|December 23, 2023
PubMed
概括

这项研究引入了三种先进的非破坏性方法 - 冲击回声,地面透雷达和阻抗光谱学 - 以准确评估城市管道网络的状况,改进了传统的摄像头和激光扫描.

关键词:
固化在位管道的管道.机器学习是机器学习.非破坏性测试是指非破坏性测试.管道缺陷 管道缺陷聚合物是一种聚合物.改装后装备是为了改进.

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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
  • 地质物理学 地质物理学

背景情况:

  • 城市污水和水道网络是关键基础设施,需要定期维护.
  • 没有沟的康复,特别是固化在现场管道 (CIPP) 技术,对城市地区至关重要.
  • 目前的诊断方法,如摄像头扫描和激光扫描,缺乏材料表征能力.

研究的目的:

  • 引入和评估三种创新的非破坏性测试 (NDT) 方法,以表征管道状况.
  • 评估冲击回声,地面透雷达 (GPR) 和阻抗光谱在检测聚合物层管道缺陷方面的有效性.
  • 用影响回声数据比较传统和深度学习机器学习算法用于缺陷表征.

主要方法:

  • 冲击回声方法与深度学习相结合,在连续波量变换图像上进行缺陷表征.
  • 具有启发式算法的地面透雷达 (GPR),用于检测管道后面的洞穴.
  • 阻抗光谱用于表征由于不均固化而导致的聚合物层分层.

主要成果:

  • 该研究成功地描述了分层,确定了CIPP背后的洞穴,并使用新型NDT方法评估了整体管道健康状况.
  • 一个深度学习算法证明了从冲击回声信号中缺陷特征的有效性.
  • GPR和阻抗光谱分别提供了地下缺陷和层分层的准确估计.

结论:

  • 与传统技术相比,所介绍的NDT方法为评估城市管道网络提供了更高的准确性和材料表征能力.
  • 这些创新方法对于有效的水和污水基础设施的维护和恢复规划至关重要.
  • 机器学习与NDT数据的整合为自动缺陷分析和条件评估提供了强大的工具.