玄武岩-聚丙烯纤维混凝土孔隙结构分形维数及力学性能研究

doi:10.19936/j.cnki.2096-8000.20230828.012

摘要/Abstract

摘要： 本文基于试验探讨了玄武岩-聚丙烯纤维对混凝土抗压强度和劈裂抗拉强度的影响,并利用光学方法的分形模型计算混凝土孔隙结构的分形维数。试验结果表明:混杂纤维能够提高混凝土的抗压强度和劈裂抗拉强度,当玄武岩纤维(BF)和聚丙烯纤维(PF)含量各为0.05%时,混杂纤维的协同效应最强,抗压强度和劈裂抗拉强度的最大增量分别为5.97%和8.46%,然而当纤维含量过高时,混杂纤维会对试件力学性能产生不利影响。玄武岩-聚丙烯纤维增强混凝土(BPFRC)的孔隙结构表现出明显的分形特征,其分形维数在2.297~2.482范围之间。分形维数与孔隙率和间距系数具有很强的相关性,随着孔隙率的增加而显著降低,随着间距系数的增加而增加。分形维数还与抗压强度和劈裂抗拉强度具有正相关关系。因此,孔隙结构的分形维数可用于评价混凝土的微观孔隙结构,也可以反映孔隙结构的复杂性对混凝土宏观力学性能的影响。

关键词: 玄武岩纤维, 聚丙烯纤维, 混杂纤维增强混凝土, 力学性能, 孔隙结构, 分形维数, 复合材料

Abstract: Based on the experiments, the influence of basalt-polypropylene fiber on the compressive strength and splitting tensile strength of concrete is discussed. The fractal dimension of concrete pore structure is calculated by using the fractal model of optical method. The experimental results show that hybrid fibers can improve the compressive strength and splitting tensile strength of concrete. When the content of basalt fiber (BF) and polypropylene fiber (PF) was 0.05%, the synergistic effect of hybrid fiber was the strongest. The maximum increment of compressive strength and splitting tensile strength is 5.97% and 8.46% respectively. However, when the fiber content is too high, the hybrid fiber will adversely affect the mechanical properties of specimens. The pore structure of basalt-polypropylene fiber reinforced concrete (BPFRC) shows obvious fractal characteristics, and its fractal dimension ranges between 2.297 and 2.482. Fractal dimension has a strong correlation with porosity and spacing coefficient. The fractal dimension decreases significantly with the increase of porosity and increases with the increase of spacing coefficient. Fractal dimension is positively correlated with compressive strength and splitting tensile strength. Therefore, the fractal dimension of pore structure can be used to evaluate the micro pore structure of concrete and reflect the influence of the complexity of pore structure on the macroscopic mechanical properties of concrete.

Key words: basalt fiber, polypropylene fiber, hybrid fiber reinforced concrete, mechanical properties, pore structure, fractal dimension, composites

中图分类号:

TB332

赵静, 李晓峰, 郭力. 玄武岩-聚丙烯纤维混凝土孔隙结构分形维数及力学性能研究[J]. 复合材料科学与工程, 2023, 0(8): 78-84.

ZHAO Jing, LI Xiaofeng, GUO Li. Study on fractal dimension and mechanical properties of basalt polypropylene fiber concrete pore structure[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(8): 78-84.

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