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
杨鑫 1于奎 1吉冯春 2聂堂哲 1李科 3白天3
作者信息
- 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
- 折叠
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.
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.
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Key words
nano-silica/basalt fiber/fiber reinforced concrete/silane coupling agent/orthogonal test/mechanical property引用本文复制引用
基金项目
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)
大学生实践教学创新项目(SPCP2023323)
出版年
2024
国家科技期刊平台
NSTL
万方数据