硅烷偶联剂改性的玄武岩纤维及其对混凝土力学性能的影响  

Basalt fibers modified by silane coupling agents and its influenceon the mechanical properties of concrete

作　　者：石旭东 汪金满 柴旭晖 杨强斌 SHI Xu-dong;WANG Jin-man;CHAI Xu-hui;YANG Qiang-bin(Gansu Province Fifth Construction Group Co.Ltd.,Tianshui 741000,China;School of Chemistry and Environmental EngineeringChongqing University of Arts and Sciences,Chongqing 402160,China)

机构地区：[1]甘肃省第五建设集团有限责任公司,甘肃天水741000 [2]重庆文理学院化学与环境工程学院,重庆402160

出　　处：《兰州理工大学学报》2024年第4期23-28,共6页Journal of Lanzhou University of Technology

基　　金：甘肃省住房与城乡建设厅科研项目(JK2021-35)。

摘　　要：为了能够改善玄武岩纤维混凝土复合材料的力学性能,采用价格较为低廉的硅烷偶联剂正硅酸乙酯,对玄武岩纤维进行表面改性,然后作为增强相引入混凝土中,以提高混凝土材料的力学性能.通过扫描电子显微镜研究纤维和混凝土的微观结构,研究玄武岩纤维对混凝土拌合物流变性的影响,并对混凝土的力学强度采用抗压强度、劈裂抗拉强度和抗折强度3个力学强度指标进行研究.结果表明:玄武岩纤维的添加使得拌合物流变性降低.玄武岩纤维经过改性后引入混凝土中,玄武岩纤维与混凝土胶凝材料形成更紧密的界面结合,在最佳添加量4 kg/m^(3)下,混凝土的抗压强度、劈裂抗拉强度和抗折强度分别提高了6.83%、21.46%、12.7%.In order to improve the mechanical properties of the composite materials of concrete with basalt fiber,the ethyl orthosilicate,which was a relatively cost-effective silane coupling agent,was used to modify the surface of basalt fibers.These modified fibers were then introduced into concrete as the reinforcing phase to improve the mechanical performance of the concrete material.The microstructure of both fibers and concrete was studied by scanning electron microscopy.The influence of basalt fibers on the rheological properties of the fresh concrete was studied.The mechanical strength of concrete was assessed by three mechanical strength indicators:compressive strength,splitting tensile strength,and flexural strength.As a result of this,the addition of basalt fibers reduces the variability of the fresh concrete.After modification,the introduction of basalt fibers into the concrete results in a tighter interface boundary adhesion between basalt fibers and concrete.At the optimal addition amount of 4 kg·m-3,the compressive strength,splitting tensile strength,and flexural strength of concrete composite materials increases by 6.83%,21.46%,and 12.7%,respectively.

关 键 词：玄武岩纤维 混凝土 表面改性 力学强度 

分 类 号：TU528[建筑科学—建筑技术科学]