碳纤维加固混凝土的粘结性能研究  

RESEARCH ON ADHESIVE PROPERTY OF CONCRETE STREGTHENED WITH CFRP

作　　者：喻林[1] 王凤霞[1] 蒋林华[1] 李中华[1] 

机构地区：[1]河海大学力学与材料学院,南京210098

出　　处：《工业建筑》2010年第10期103-105,110,共4页Industrial Construction

基　　金：江苏省建筑工程管理局项目(JS200438)

摘　　要：将加固后的混凝土放置在自然环境、水环境、酸环境、碱环境、碳化环境中14,56 d。通过测量混凝土与碳纤维布之间的正拉强度及观察破坏形式,研究不同侵蚀环境对碳纤维布加固混凝土粘结性能的影响。研究表明:外界环境作用14 d后,酸环境对混凝土正拉强度的不利影响最大,其次为碳化环境、碱环境、水环境。环境作用56 d后,同样酸环境对混凝土正拉强度的不利影响最大,其次为碱环境、水环境,而碳化环境使得正拉粘结强度有所提高。环境作用14 d后,只有在酸环境下碳纤维布加固混凝土的破坏形式为粘结破坏,其他环境下均为混凝土受拉破坏,说明酸环境对碳纤维布与混凝土之间的粘结性能影响较大。环境作用56 d后,在水环境、酸环境、碱环境作用下的试件为碳纤维布与混凝土之间的粘结破坏;自然环境、碳化环境作用下的试件为混凝土拉断破坏。随着时间的增加,外界侵蚀环境对碳纤维布与混凝土之间粘结强度产生越来越不利的影响。The concrete strengthened was placed in the natural,water,acid,alkaline and carbonation environments for 14 d and 56 d.Effect of erosion medium on adhesive property between the concrete strengthened and CFRP was researched by measuring the normal tensile strength and observing the destructional forms between concrete and CFRP.The results showed that the normal tensile strength was obviously reduced by acid environment and followed by carbonation environment,alkaline environment,water environment after 14 d.The tensile strength was also obviously reduced by acid environment and followed by alkaline environment,water environment after 56 d.Carbonationt environmen increased the novmal tensile strength between the concrete strengthened and CFRP.After 14 d destructional forms of the concrete strengthened with CFRP only in the acid environment was the bond failure between concrete and CFRP;and under natural and carbonation environments concrete was damaged due to tension stress.This illustrated that acid environment greatly affected the adhesive property between concrete and CFRP.After 56 d destructional form of the concrete in water,acid,and alkaline environments was the bond failure between concrete and CFRP and under other environments concrete was damaged as a result of normal tension stress。This showed that erosion environment more and more greatly affected the adhesive property between concrete and CFRP with increase of ersion time.

关 键 词：碳纤维 加固 混凝土 粘结性能 

分 类 号：TU375[建筑科学—结构工程]