纳米改性环氧树脂增强CFRP-混凝土体系粘结及滑移性能研究
Study on bonding and sliding performance of nano-modified epoxy resin reinforced CFRP-concrete system
冉洪宇 1张若兰 1雷真 1杨昌波 1罗煜民 1赵容晨1
作者信息
- 1. 云南大学建筑与规划学院,云南 昆明 650032
- 折叠
摘要
为研究TiO2/有机蒙脱土(OMMT)/环氧树脂(EP)复合材料对CFRP-混凝土界面粘结及滑移性能的影响,对TiO2/OMMT/环氧复合材料配比进行优化并将其应用于CFRP-混凝土体系的双搭接剪切实验.结果表明:在OMMT/EP复合材料中加入适量的纳米TiO2可显著提高蒙脱土的剥离程度,当填料(TiO2+OMMT)的质量分数为2％时,复合材料的拉伸强度、断裂伸长率以及冲击强度分别为纯环氧树脂的153.06％、159.09％和159.19％.作为胶粘剂用于CFRP-混凝土体系时,TiO2/OMMT/EP复合材料增强了纤维与混凝土基体之间的界面附着力及载荷传递,从而提高了界面的极限承载力.与纯环氧树脂双剪试件相比,CFRP-混凝土界面的粘结强度和界面断裂能分别提升了 129.83％和168.82％.引入纳米改性胶粘剂/CFRP-混凝土界面粘结综合影响系数α,建立了相应的CFRP-混凝土界面粘结-滑移模型,模型的计算曲线与实验曲线吻合较好.
Abstract
In order to study the effect of TiO2/OMMT/epoxy resin composite material on the bonding and sliding performance of CFRP-concrete interface,the ratio of TiO2/OMMT/epoxy composite material was optimized and applied to the double bond shear experiment of CFRP-concrete system.The results showed that when the content of TiO2+OMMT was 2wt％,the tensile strength,elongation at break and impact strength were 153.06％,159.09％and 159.19％of pure epoxy resin,respectively.When used as an adhesive in CFRP-concrete system,TiO2/OMMT/epoxy composite material enhanced the interface adhesion and load transfer between fiber and concrete matrix,thus improving the ultimate bearing capacity of the interface.Compared with the double-shear specimen using pure epoxy resin,the bond strength and interface fracture energy of CFRP-concrete interface were increased by 129.83％and 168.82％,respectively.
关键词
二氧化钛/蒙脱土/纳米改性/环氧树脂/碳纤维增强复合材料/混凝土/粘结强度/界面断裂能Key words
titanium dioxide/montmorillonite/nano-modification/epoxy resin/carbon fiber reinforced composite/concrete/bond strength/interface fracture energy引用本文复制引用
基金项目
国家自然科学基金(52268038)
云南省基础研究面上计划(202201AT070159)
出版年
2024
NETL
NSTL
万方数据