The Study of Post-Fire-Curing and CFRP Strengthing Effects on Concrete Specimens

• Main Authors: Chia-feng Liu, 劉嘉峰
• Other Authors: Ching-chang Lin
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/17973759072512173751

碩士 === 逢甲大學 === 土木工程所 === 95 === In this thesis, the carbon fiber reinforced polymer (CFRP) retrofitting behaviors of fire-damaged concrete specimens with post-fire-curing are investigated. A total of 153 cylindrical concrete specimens with 12cm in diameter and 24cm in height is made. These specimens are exposed to different temperature and exposure period of time. They are then re-cured in the air or water for four curing ages. The purposes of tests are to analyze the effects of various parameters on residual strength of fire-damaged specimens and establish analytical models to predict compressive strength of these specimens. The results indicate that the residual strength of fire-damaged specimens rises gradually with the curing age. After 180 days with air curing, the residual strength of fire-damaged specimens in 400℃ approaches the original strength of specimens, and the residual strength of fire-damaged specimens in 600℃ is 62% of the original strength of specimens. The residual strength of fire-damaged specimens in 600℃ rises better than that in 400℃ after 28 days with intermittent water curing. After 180 days with intermittent water curing, the residual strength approaches the original strength, no matter what the temperatures are. Besides, CFRP retrofitting can significantly increase both strength and ductility of fire-damaged concrete specimens. In conclusion, analytical models are established by multiple regression to predict compressive strength of fire-damaged specimens with different curing methods and CFRP strengthening.