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宏观纤维对层状纤维增强混凝土渗透性和裂缝表面形貌的影响。

Effect of Macro Fibers on the Permeability and Crack Surface Topography of Layered Fiber Reinforced Concrete.

作者信息

Zeng Wei, Wang Weiqi, Wang Qiannan, Li Mengya, Zhang Lining, Tong Yunyun

机构信息

School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China.

Zhejiang International Science and Technology Cooperation Base for Waste Resource Recycling and Low-Carbon Building Materials Technology, Zhejiang University of Science and Technology, Hangzhou 310023, China.

出版信息

Materials (Basel). 2024 Apr 10;17(8):1733. doi: 10.3390/ma17081733.

DOI:10.3390/ma17081733
PMID:38673091
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11050954/
Abstract

This paper describes the effects of macro fibers on permeability and crack surface topography of layered fiber-reinforced concrete (FRC) specimens with different layering ratios under uniaxial tensile load. The crack permeability of layered FRC specimens is investigated by a self-designed permeability setup. The topographical analysis of crack surfaces is investigated by a custom-designed laser scanning setup. The results show that when the fiber volume content and layering ratio of the FRC layer are constant, the tensile toughness of layered FRC specimens depends on the proportion of steel fiber in macro fibers, and with an increase in the proportion of steel fiber, the tensile toughness of layered FRC specimens increases. For the layered FRC specimens, the crack permeability is much lower than that of the normal concrete (NC) specimen. A significant positive synergistic effect on crack impermeability can be achieved by the combination of steel fiber and polypropylene fiber in the SF80PP2.3 specimen. The crack surface roughness parameter () values of the NC layer in layered FRC specimens are all higher than those of the NC specimen, and the crack surface of the FRC layer in layered FRC specimens is higher than that of the unlayered FRC specimens. This can effectively increase the head loss of cracks and reduce the crack permeability of layered FRC specimens.

摘要

本文描述了在单轴拉伸载荷下，宏观纤维对不同分层比的层状纤维增强混凝土（FRC）试件的渗透性和裂缝表面形貌的影响。通过自行设计的渗透性装置研究层状FRC试件的裂缝渗透性。通过定制设计的激光扫描装置研究裂缝表面的形貌分析。结果表明，当FRC层的纤维体积含量和分层比恒定时，层状FRC试件的拉伸韧性取决于宏观纤维中钢纤维的比例，并且随着钢纤维比例的增加，层状FRC试件的拉伸韧性增加。对于层状FRC试件，其裂缝渗透性远低于普通混凝土（NC）试件。在SF80PP2.3试件中，钢纤维和聚丙烯纤维的组合可对裂缝抗渗性产生显著的正协同效应。层状FRC试件中NC层的裂缝表面粗糙度参数（）值均高于NC试件，层状FRC试件中FRC层的裂缝表面高于未分层FRC试件。这可以有效地增加裂缝的水头损失，降低层状FRC试件的裂缝渗透性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9901/11050954/f2bc26053bb0/materials-17-01733-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9901/11050954/14e1a76f026c/materials-17-01733-g013a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9901/11050954/f2bc26053bb0/materials-17-01733-g014.jpg

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本文引用的文献

1
Effect of Carbon Black and Hybrid Steel-Polypropylene Fiber on the Mechanical and Self-Sensing Characteristics of Concrete Considering Different Coarse Aggregates' Sizes.考虑不同粗骨料尺寸时，炭黑与钢-聚丙烯混杂纤维对混凝土力学及自传感特性的影响
Materials (Basel). 2021 Dec 4;14(23):7455. doi: 10.3390/ma14237455.
2
Flexural Behavior of Composite Concrete Slabs Made with Steel and Polypropylene Fibers Reinforced Concrete in the Compression Zone.采用钢纤维和聚丙烯纤维增强混凝土的复合混凝土板在受压区的抗弯性能。
Materials (Basel). 2020 Aug 15;13(16):3616. doi: 10.3390/ma13163616.