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相关概念视频

Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

78
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
78
Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

117
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...
117
Microcracking in Concrete01:20

Microcracking in Concrete

117
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...
117
Corrosion of Reinforcement01:27

Corrosion of Reinforcement

182
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
182
Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

132
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...
132
Reinforcements in Concrete01:25

Reinforcements in Concrete

87
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
87

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Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors
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在FRP增强混凝土元素中检测损坏.

Pranit Malla1, Seyed Saman Khedmatgozar Dolati1, Jesus D Ortiz2

  • 1Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USA.

Materials (Basel, Switzerland)
|March 13, 2024
PubMed
概括

地面透雷达 (GPR) 和分相阵列超声波 (PAU) 方法在纤维增强聚合物 (FRP) 增强混凝土 (FRP-RC) 中检测损坏方面表现有希望. GPR有效地识别了玻璃FRP和碳FRP的损伤,而PAU仅限于碳FRP损伤检测.

关键词:
使用FRP增强混凝土 (FRP-RC) 的混凝土.用纤维增强的聚合物 (FRP)通过地面穿透雷达 (GPR) 进行测试.非破坏性测试 (NDT) 是指非破坏性测试.阶段阵列超声波 (PAU) 超声波超声波测试 (UT) 是指超声波测试.

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Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
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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
  • 结构健康监测 结构健康监测

背景情况:

  • 与混凝土结构中的钢相比,纤维增强聚合物 (FRP) 复合材料具有优越的性能,如耐腐蚀性和耐久性.
  • 对FRP增强混凝土 (FRP-RC) 的非破坏性测试 (NDT) 方法的研究有限,由于评估挑战,阻碍了广泛采用.

研究的目的:

  • 评估地面透雷达 (GPR) 和分相阵列超声波 (PAU) 在FRP-RC元件中检测损坏的适用性.
  • 确定GPR和PAU的检测能力和局限性,用于各种FRP类型和缺陷场景.

主要方法:

  • 研究了三块玻璃FRP (GFRP),碳FRP (CFRP) 和玄武岩FRP (BFRP) 增强的板样.
  • 多样化的条形直径,深度和引入的缺陷类型来评估NDT方法的性能.
  • 通过GPR和PAU技术比较损坏检测结果.

主要成果:

  • GPR成功检测到GFRP条和CFRP线程中的损伤.
  • PAU表现出局限性,只能有效地检测到CFRP线条的损伤.
  • 这两种方法都显示出潜力,但也突出了FRP-RC评估的具体局限性.

结论:

  • 像GPR和PAU这样的传统的NDT方法可以应用于FRP-RC结构以检测损坏.
  • 需要进一步的研究来完善NDT技术,以便在FRP-RC中获得更广泛的适用性和可靠性.
  • 该研究提供了对FRP-RC的NDT当前能力和未来研究方向的见解.