冻融循环作用下嵌入式BFRP筋与混凝土粘结性能研究  

EXPERIMENTAL STUDY OF BOND BETWEEN NEAR-SURFACE MOUNTED BFRP BARS AND CONCRETE UNDER FREEZE-THAWING CYCLES

作　　者：金亮亮 杨树桐[1] JIN Liang-liang;YANG Shu-tong(College of Engineering Ocean University of China,Qingdao 26600,China)

机构地区：[1]中国海洋大学工程学院,青岛266100

出　　处：《复合材料科学与工程》2020年第8期70-75,共6页Composites Science and Engineering

基　　金：国家自然科学基金项目(51378481)。

摘　　要：为探究高寒地区冻融循环作用对嵌入式FRP加固混凝土界面粘结耐久性能的影响,针对玄武岩纤维增强复合材料(BFRP)筋嵌入式加固混凝土结构,通过采用环氧树脂胶(EP)和高韧性纤维增强水泥基复合材料(ECC)作为粘结材料的嵌入式FRP筋-从混凝土中拉拔试验,分析冻融循环作用下嵌入式FRP-混凝土相邻层之间的破坏模式和粘结退化机理,研究冻融循环次数、粘结材料、混凝土基体性能对粘结性能的影响。结果表明:不同侵蚀条件下试件破坏模式基本表现为胶基体与混凝土剪切破坏、胶基体劈裂破坏、毗邻混凝土-胶界面混凝土薄层剪切破坏、ECC基体与混凝土剪切破坏、FRP与ECC界面粘结破坏五种破坏模式,试件的极限粘结承载力随着循环次数的增加而呈不同程度的下降,50次循环内对试件粘结性能的影响较小,ECC试件相比环氧树脂胶试件,粘结承载力低,但表现出良好的延性。Alpine areas to explore the effect of freeze-thaw cycles on the embedded FRP reinforcement concrete interface bonding durability,in view of the basalt fiber reinforced composite material(BFRP)tendons embedded reinforcement concrete structure,using epoxy resin(EP)and high toughness of fiber reinforced cement matrix composites(ECC)as the bonding material embedded FRP reinforcement-pull-out tests,from the concrete analysis under the action of freeze-thaw cycle embedded FRP and concrete interface failure mode and the bonding mechanism of degradation,the freezing and thawing cycles,bonding materials,concrete substrate effect on the properties of adhesive performance,the results showed that:Basic performance under the condition of different erosion specimen failure mode for the rubber matrix and shear failure of concrete,rubber matrix fracturing,adjacent to the concrete-concrete thin layer of adhesive interface shear failure,ECC matrix and shear failure of concrete,FRP and ECC interface bond destruction of five kinds of failure modes,the ultimate bond bearing capacity of the specimen increased with the increase of cycling times show varying degrees of decline,within fifty loops on the cohesive force of specimen is small,the influence of ECC specimen compared to epoxy resin adhesive specimen,caking capacity below the epoxy resin specimens,but showed good ductility.

关 键 词：冻融循环 嵌入式加固 BFRP筋 粘结性能 高韧性纤维增强水泥基复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]