在冷解周期下,混合纤维增强混凝土和BFRP条之间结合性能
1School of Civil Engineering, Shenyang Jianzhu University, Shenyang, China.
PloS one
|May 13, 2024
概括
混合纤维增强基岩纤维增强聚合物 (BFRP) 在结解周期下的混凝土粘合性能. 结合玄武纤维 (BF) 和纤维素纤维 (CF) 显著提高了结合强度,防止分裂失败.
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
- 结构工程 结构工程
背景情况:
- 纤维增强聚合物 (FRP) 条越来越多地用于混凝土结构.
- 了解它们在结解周期等环境压力因素下的债券表现至关重要.
- 混合纤维的整合为混凝土性能提供了潜在的改进.
研究的目的:
- 研究结解周期对混凝土中BFRP条的结合行为的影响.
- 评估混合纤维 (玄武纤维和纤维素纤维) 结合对这种结合性能的影响.
- 评估BP神经网络对键强度的预测准确度.
主要方法:
- 拉出测试是在BFRP条形混凝土样本上进行的,这些样本经历了不同的冷解周期.
- 债券滑动曲线被分析并使用已建立的构成模型来拟合.
- 一个反向传播 (BP) 神经网络被用来预测键的强度.
主要成果:
- 结解周期增加了峰值滑动,但降低了结合的刚性和强度.
- 混合纤维的结合防止了分裂失败,并显著提高了结合强度.
- 马尔瓦尔和连续曲线模型最适合上升和下降的债券滑动曲线,分别.
- 英国石油的神经网络实现了准确的债券强度预测,大多数错误低于10%.
结论:
- 混合纤维增强混凝土在融条件下提高了BFRP条条结合性能.
- 普通混凝土中的BFRP条在50个结解周期后容易发生裂裂故障.
- 开发的BP神经网络模型是预测BFRP-混凝土键强度的可靠工具.
更多相关视频
07:15A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli
Published on: December 11, 2014
13.8K
06:21Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors
Published on: April 10, 2018
7.1K
相关概念视频
01:29Frost Resistant Concrete
76
Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of...
76
01:22Fiber Reinforced Concrete
75
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...
75
01:27Frost Action on Concrete
97
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...
This freeze-thaw cycle primarily causes surface scaling, where...
97
01:25Reinforcements in Concrete
83
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...
83
01:23Abrasion Resistance of Concrete
128
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...
One such test is the revolving disc test, where three plates...
128
01:27Cold Weather Concreting
70
When freshly poured concrete is exposed to freezing temperatures before it has set, the water within the concrete can freeze. This expansion disrupts the setting process, delays chemical reactions necessary for hardening, and increases the volume of pores within the hardened concrete, which weakens its overall structure. If the concrete manages to reach an appreciable strength before it freezes, the damage can be somewhat mitigated.
To counteract the negative impacts of cold weather, ensuring...
To counteract the negative impacts of cold weather, ensuring...
70