SiO2/KH560改性玄武岩纤维混凝土力学性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 102-112.

SiO₂/KH560改性玄武岩纤维混凝土力学性能研究

杨鑫¹, 于奎¹, 吉冯春², 聂堂哲¹, 李科³, 白天³

1.黑龙江大学水利电力学院,哈尔滨 150800;
2.国防科技大学空天科学学院,新型陶瓷纤维及其复合材料重点实验室,长沙 410073;
3.南阳师范学院土木工程学院,冲击与结构安全重点实验室,南阳 473061

收稿日期:2023-09-25 修订日期:2023-11-25 出版日期:2024-01-15 发布日期:2024-01-16
通信作者: 于奎,副教授。E-mail:1995075@hlju.edu.cn
作者简介:杨鑫(1997—),男,硕士研究生。主要从事水利水电工程和高性能混凝土的研究。E-mail:yxyangxin16@foxmail.com
基金资助:
河南省高校人文社会科学研究一般项目(2021-ZDJH-0257);大学生实践教学创新项目(SPCP2023355,SPCP2023323)

Mechanical Properties of SiO₂/KH560 Modified Basalt Fiber Reinforced Concrete

YANG Xin¹, YU Kui¹, JI Fengchun², NIE Tangzhe¹, LI Ke³, BAI Tian³

1. College of Water Resources and Electric Power, Heilongjiang University, Harbin 150800, China;
2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;
3. Key Laboratory of Impact and Structural Safety, College of Civil Engineering, Nanyang Normal University, Nanyang 473061, China

Received:2023-09-25 Revised:2023-11-25 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

摘要： 为了研究硅烷偶联剂(KH560)和纳米SiO₂协同KH560改性玄武岩纤维(BF)对混凝土力学性能的影响,本文采用KH560对BF进行表面改性,制得KH560-BF,并采用纳米SiO₂和KH560改性BF制得SiO₂-KH560-BF。通过正交试验筛选出高强度改性纤维,研究了纳米SiO₂分散液、润滑剂和KH560三者的质量分数对SiO₂-KH560-BF的丝束强度影响。采用SEM和EDS对改性混凝土的7和28 d的力学性能进行评估,并对混凝土的微观结构进行表征。结果表明,SiO₂-KH560-BF的最佳上浆剂成分为纳米SiO₂分散液1.6%、润滑剂0.4%和KH560 0.5%,且三个因素的影响程度从大到小依次为纳米二氧化硅分散液、KH560、润滑剂。与KH560-BF相比,SiO₂-KH560-BF纤维丝束强度提高了8.62%,拉伸强度提高了4.41%,Si含量提升了24.9%,并且从SEM照片中可以看出SiO₂-KH560-BF团状堆积比KH560-BF少。掺入适量SiO₂-KH560-BF的混凝土7和28 d抗压、劈裂抗拉和轴心抗压强度提升效果均高于掺入KH560-BF的混凝土。

关键词: 纳米二氧化硅, 玄武岩纤维, 纤维混凝土, 硅烷偶联剂, 正交试验, 力学性能

Abstract: To study the effect of silane coupling agent (KH560) and nano-SiO₂ synergistically KH560 modified basalt fiber (BF) on the mechanical properties of concrete, KH560 was used to surface modify for BF to produce KH560-BF, and nano-SiO₂ and KH560 were used to modify BF to produce SiO₂-KH560-BF. Orthogonal tests were used to screene high-strength modified fibers, and the effects of mass fractions of nano-SiO₂ dispersion, lubricant and KH560 on the filament bundle strength of SiO₂-KH560-BF were investigated. The mechanical properties of modified concrete at 7 and 28 d were evaluated and the microstructure of the concrete was characterized by SEM and EDS. The results show that the optimal upper agent composition for SiO₂-KH560-BF is nano-SiO₂ dispersion 1.6%, lubricant 0.4%, and KH560 0.5%, and the degree of influence of the three factors is nano-SiO₂ dispersion>KH560>lubricant. Compared with KH560-BF, the fiber tow strength of SiO₂-KH560-BF increases by 8.62%, tensile strength increases by 4.41%, Si content increases by 24.9%, and there were fewer agglomerated buildups in the SEM images of SiO₂-KH560-BF than those of KH560-BF. The 7 and 28 d compressive, split tensile, and axial compressive strength enhancement effects of the concrete with a moderate amount of SiO₂-KH560-BF are higher than those of the concrete with KH560-BF.

Key words: nano-silica, basalt fiber, fiber reinforced concrete, silane coupling agent, orthogonal test, mechanical property

中图分类号:

TU528

杨鑫, 于奎, 吉冯春, 聂堂哲, 李科, 白天. SiO₂/KH560改性玄武岩纤维混凝土力学性能研究[J]. 硅酸盐通报, 2024, 43(1): 102-112.

YANG Xin, YU Kui, JI Fengchun, NIE Tangzhe, LI Ke, BAI Tian. Mechanical Properties of SiO₂/KH560 Modified Basalt Fiber Reinforced Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 102-112.

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SiO₂/KH560改性玄武岩纤维混凝土力学性能研究

Mechanical Properties of SiO₂/KH560 Modified Basalt Fiber Reinforced Concrete

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