The Testing Study for Durability of CFRP Sheets on Strengthening Concrete Members

• Main Authors: Yen-Tsung Lin, 林延宗
• Other Authors: Ming-Gin Lee
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/62595481982764199015

碩士 === 朝陽科技大學 === 營建工程系碩士班 === 90 === Abstract Retrofit and repair of RC structures has been an important issue in civil engineering nowadays. The implementation of structural strengthening with CFRP sheets is a new trend in the world. For civil engineers, carbon fiber reinforcement polymers (CFRP) is a kind of new material. Due to their high strength-to-weigh and stiffness-to-weigh ratio; fatigue and electricity resistance; high pull strength in one direction; ease of handling; and ease of fabrication, there is a lot of potential in the application of civil engineering. Extensive research has been carried out on using CFRP composites for repair and strengthening; however, information about their durability is still lacking. The long-term durability of CFRP composites is a crucial factor in successful application as repair materials or as reinforcement for concrete. In this study, CFRP is used to investigate the durability on strengthening concrete members. In order to assure the effect of strengthening material, CFRP wrapped specimens which would subject to different environment including outdoor, seawater, ultraviolet (UV), ultraviolet and seawater accelerating test exposures were tested on compressive strength, flexural strength, bond strength and surface hardness tests. The study on the durability for strengthening of concrete specimens would be used the above environment conditions and tests to evaluate. From the testing results, concrete specimens which wrapped CFRP sheets improve on compressive strength, flexural strength and ductility. After four environment test exposures, there is no big reduction in compressive and flexural strength. All environment tests didn’t break the bond between the CFRP reinforcement system and the concrete.