摘要
为改善钢纤维与混凝土基体间的结合作用,本文以γ-氨丙基三乙氧基硅烷(KH-550)和硅酸四乙酯(TEOS)为基底制备改性溶液,采用溶胶-凝胶法对钢纤维进行改性,通过控制改性溶液中硅烷偶联剂和硅酸四乙酯的相对比例作为对照进行改性纤维制备与试验,并通过纤维拉拔试验,从宏观角度对钢纤维与混凝土界面处黏结性能进行研究。结果表明:1)经过KH-550和TEOS复合溶液的改性作用,钢纤维表面粗糙度得到显著改善;2)当KH-550和TEOS的比例增加时,钢纤维拉拔试验结果会有所提升,之后会出现下降趋势,在相对比例为3:1时,改性钢纤维表面形貌良好、平整度高且附着力强,涂层效果最好。本文研究成果可为解决钢纤维在混凝土材料中强度利用率较低的问题提供一定的借鉴与参考。
In order to improve the conjugation between steel fiber and concrete matrix,the modified solution is prepared withγ-aminopropyltriethoxysilane(KH-550)and tetraethyl silicate(TEOS)as the substrate,the steel fiber is modified by sol-gel method,the preparation and test of modified fibers are carried out by controlling the relative ratio of silane coupling agent and tetraethyl silicate in the modified solution,and the viscosity at the interface between steel fiber and concrete is studied from a macroscopic perspective through a fiber pull out test.The results show that:1)the surface roughness of steel fiber is significantly improved by the modification action of KH-550 and TEOS composite solution.2)When the ratio of KH-550 and TEOS increases,the steel fiber pull out test results will be improved,and then a downward trend will occur,when the relative ratio is 3:1,the modified steel fiber surface morphology is good,the flatness is high,the adhesion is strong,and the coating effect is the best.The results can provide a certain reference for solving the problem of low strength utilization rate of steel fiber in concrete materials.
作者
雷子杰
夏效静
韩雨桐
郑泽平
LEI Zijie;XIA Xiaojing;HAN Yutong;ZHENG Zeping(School of Civil engineering,Central South University of Forestry and Technology,Changsha 410004,Hunan,China)
出处
《工程建设》
2023年第11期6-11,共6页
Engineering Construction
基金
湖南省教育厅科学研究资助项目(20B623)
湖南省科技创新计划资助项目(2020RC4049)
湖南省自然科学基金资助项目(2021JJ41078)
湖南省教育厅青年基金资助项目(19B593)
中南林业科技大学研究生科技创新基金资助项目(2022CX02085)。
关键词
改性钢纤维
表面改性
拉拔试验
黏结强度
modified steel fiber
surface modification
pull out test
bonding strength
