SiO_(2)/KH560改性玄武岩纤维混凝土力学性能研究  

Mechanical Properties of SiO_(2)/KH560 Modified Basalt Fiber Reinforced Concrete

作　　者：杨鑫 于奎[1] 吉冯春 聂堂哲 李科 白天 YANG Xin;YU Kui;JI Fengchun;NIE Tangzhe;LI Ke;BAI Tian(College of Water Resources and Electric Power,Heilongjiang University,Harbin 150800,China;Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China;Key Laboratory of Impact and Structural Safety,College of Civil Engineering,Nanyang Normal University,Nanyang 473061,China)

机构地区：[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

出　　处：《硅酸盐通报》2024年第1期102-112,共11页Bulletin of the Chinese Ceramic Society

基　　金：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)。

摘　　要：为了研究硅烷偶联剂(KH560)和纳米SiO_(2)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SiO_(2)和KH560改性BF制得SiO_(2)-KH560-BF。通过正交试验筛选出高强度改性纤维,研究了纳米SiO_(2)分散液、润滑剂和KH560三者的质量分数对SiO_(2)-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,SiO_(2)-KH560-BF的最佳上浆剂成分为纳米SiO_(2)分散液1.6%、润滑剂0.4%和KH5600.5%,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,SiO_(2)-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SiO_(2)-KH560-BF团状堆积比KH560-BF少。掺入适量SiO_(2)-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。To study the effect of silane coupling agent(KH560)and nano-SiO_(2) 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-SiO_(2) and KH560 were used to modify BF to produce SiO_(2)-KH560-BF.Orthogonal tests were used to screene highstrength modified fibers,and the effects of mass fractions of nano-SiO_(2) dispersion,lubricant and KH560 on the filament bundle strength of SiO_(2)-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 SiO_(2)-KH560-BF is nano-SiO_(2) dispersion 1.6%,lubricant 0.4%,and KH5600.5%,and the degree of influence of the three factors is nano-SiO_(2) dispersion>KH560>lubricant.Compared with KH560-BF,the fiber tow strength of SiO_(2)-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 SiO_(2)-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 SiO_(2)-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 

分 类 号：TU528[建筑科学—建筑技术科学]