用偶联剂KH550与纳米SiO₂协同改性玄武岩纤维（BF），研究了BF表面改性对玄武岩纤维混凝土（BFRC）力学性能的影响.结果表明：经KH550与纳米SiO₂改性后，BF表面出现了C—H键，且Si—O—Si键对应的振动峰变强；当纳米SiO₂用量为BF质量的3%时，BF形貌变化最为明显，此时改性BFRC的力学强度及抗裂性能均高于普通BFRC；在KH550的桥联作用下，纳米SiO₂可有效增强纤维与混凝土基体的黏结强度，进而提高BFRC的力学强度和抗裂性能.

Basalt fiber（BF） was modified by coupling agent（KH550） and nano-SiO₂， and the effect of BF surface modification on the mechanical properties of basalt fiber reinforced concrete（BFRC） was studied. The results show that after modification with KH550 and nano-SiO₂， the surface of BF forms C—H bonds， and the vibration peak corresponding to Si—O—Si bonds becomes stronger. When the amount of nano-SiO₂ is 3% of the mass of BF， the morphology of BF changes most significantly， and the mechanical strength and crack resistance of modified BFRC are significantly higher than those of ordinary BFRC. Under the bridging effect of KH550， nano-SiO₂ can effectively enhance the bonding strength between fibers and the concrete matrix， thereby improving the mechanical strength and crack resistance of BFRC

TU526;

辽宁省教育厅青年基金资助项目（LJKQZ2021153）；辽宁工程技术大学首批“双一流”学科建设创新团队项目（LNTU20TD-12）