盐侵冻融循环下聚乙烯醇纤维混凝土孔结构分形特征

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (5): 1859-1866.

所属专题：水泥混凝土

盐侵冻融循环下聚乙烯醇纤维混凝土孔结构分形特征

吴浩¹, 薛维培^1,2, 王中建¹

1.安徽理工大学土木建筑学院,淮南 232001;
2.安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室,淮南 232001

收稿日期:2023-11-15 修订日期:2024-02-12 出版日期:2024-05-15 发布日期:2024-06-06
通信作者: 薛维培,博士,副教授。E-mail:xueweipei@163.com
作者简介:吴浩(2000—),男,硕士研究生。主要从事混凝土材料等方面的研究。E-mail:austwuhao@163.com
基金资助:
国家自然科学基金青年科学基金(52308228);安徽省自然科学基金面上项目(2208085ME146);教育部“春晖计划”合作科研项目(HZKY20220204);深部煤矿采动响应与灾害防控国家重点实验室自主课题(SKLMRDPC20ZZ05)

Pore Structure Fractal Characteristics of PVA Fiber Concrete under Salt Erosion and Freeze-Thaw Cycle

WU Hao¹, XUE Weipei^1,2, WANG Zhongjian¹

1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
2. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China

Received:2023-11-15 Revised:2024-02-12 Online:2024-05-15 Published:2024-06-06

摘要/Abstract

摘要： 为研究聚乙烯醇(PVA)纤维对混凝土孔结构的影响及其与抗冻性能的联系,本文通过核磁共振技术对冻融循环作用下PVA纤维混凝土的微观孔结构进行了测试,分析了核磁共振T₂谱和孔隙分布变化规律,并基于分形理论探究了其孔隙分形特征,揭示了冻融循环作用下PVA纤维混凝土孔结构与分形维数之间的关系。结果表明,PVA纤维混凝土在冻融循环前期表现出较好的抗冻性能;中孔(100 nm＜r≤1 000 nm)和大孔(r＞1 000 nm)的数量及占比增加,削弱了PVA纤维混凝土的抗冻性能;PVA纤维混凝土具有一定的分形特征,分形维数D_max在5次冻融循环前增大,而后随着冻融循环次数增加不断减小。

关键词: 冻融循环, 聚乙烯醇纤维混凝土, 孔结构, 核磁共振, 分形维数, 抗冻性能

Abstract: To study the effect of polyvinyl alcohol (PVA) fibers on pore structure of concrete and its connection with frost resistance performance, the microscopic pore structure of PVA fiber concrete under the action of freeze-thaw cycle was tested by nuclear magnetic resonance (NMR) technology, the NMR T₂ spectrum and the change rule of pore distribution were analysized, and the pore fractal characteristics were explored based on fractal theory to reveal the relationship between the pore structure of PVA fiber concrete under the action of freeze-thaw cycle and fractal dimension. The relationship between pore structure and fractal dimension of PVA fiber concrete under the freeze-thaw cycle was revealed. The results show that PVA fiber concrete shows better frost resistance in the pre-freeze-thaw cycle period. The number and percentage of medium pores (100＜r≤1 000 nm) and large pores (r＞1 000 nm) increase, which weaken the frost resistance of PVA fiber concrete. The PVA fiber concrete has a certain fractal characteristic, and the fractal dimension D_max increases before five times freeze-thaw cycles and decreases with the increase of freeze-thaw cycles times.

Key words: freeze-thaw cycle, PVA fiber concrete, pore structure, nuclear magnetic resonance, fractal dimension, frost resistance

中图分类号:

TB332

吴浩, 薛维培, 王中建. 盐侵冻融循环下聚乙烯醇纤维混凝土孔结构分形特征[J]. 硅酸盐通报, 2024, 43(5): 1859-1866.

WU Hao, XUE Weipei, WANG Zhongjian. Pore Structure Fractal Characteristics of PVA Fiber Concrete under Salt Erosion and Freeze-Thaw Cycle[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(5): 1859-1866.

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盐侵冻融循环下聚乙烯醇纤维混凝土孔结构分形特征

Pore Structure Fractal Characteristics of PVA Fiber Concrete under Salt Erosion and Freeze-Thaw Cycle

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