[1] Li Shan, Ren Huitao, Huang Chengkui, Cui Yunfei, et al. Durability of concrete beams reinforced with CFRP sheetunder wet-dry cycles and loading [J]. Journal of Southeast University (English Edition), 2009, 25 (3): 376-380. [doi:10.3969/j.issn.1003-7985.2009.03.019]
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Durability of concrete beams reinforced with CFRP sheetunder wet-dry cycles and loading(
)
干湿交替与荷载作用下CFRP加固混凝土梁的耐久性
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 25
- Issue:
- 2009 3
- Page:
- 376-380
- Research Field:
- Materials Sciences and Engineering
- Publishing date:
- 2009-09-30
Info
- Title:
- Durability of concrete beams reinforced with CFRP sheetunder wet-dry cycles and loading
- 干湿交替与荷载作用下CFRP加固混凝土梁的耐久性
- Author(s):
- Li Shan; Ren Huitao; Huang Chengkui; Cui Yunfei
- State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
- Keywords:
- reinforced concrete beams; reinforced; carbon fiber reinforced polymers; durability; wet-dry cycles; sustained load
- PACS:
- TU528.57
- DOI:
- 10.3969/j.issn.1003-7985.2009.03.019
- Abstract:
- The test results of eight concrete beams reinforced with carbon fiber reinforced polymer(CFRP)sheets subjected to an aggressive environment under a sustained load are presented.The beams are 1 700 mm long with a rectangular cross-section of 120-mm width and 200-mm depth.The beams are precracked with a four-point flexural load, bonded CFRP sheets, and placed into wet-dry saline water(NaCl)either in an unstressed state or loaded to about 30% or 60% of the initial ultimate load.The individual and coupled effects of wet-dry saline water and sustained bending stresses on the long term behaviour of concrete beams reinforced with the CFRP are investigated.The test results show that the coupled action of wet-dry saline water and sustained bending stresses appears to significantly affect the load capacity and the failure mode of beam strengthened with CFRP, mainly due to the degradation of the bond between CFRP and concrete.However, the stiffness is not affected by the coupled action of wet-dry cycles and a sustained load.
- 对8根持载与恶劣环境作用后的碳纤维增强聚合物(CFRP)加固混凝土梁进行了试验研究.梁的尺寸为1 700 mm×120 mm×200 mm.首先采用4点分加载方式对梁进行预裂, 卸载后粘贴CFRP片材, 然后放入腐蚀环境.影响因素考虑了干湿交替与持载水平(持载水平分别为30%和60%混凝土梁极限荷载).分析了干湿交替单一因素和荷载与干湿交替双重因素对CFRP加固梁的长期性能.试验结果表明:荷载与干湿交替双重因素对CFRP加固梁的承载力和破坏形态影响较大, 这主要是由于CFRP与混凝土界面的劣化引起;对CFRP加固梁的刚度几乎没有影响.
References:
[1] Teng J G, Chen J F, Smith S T, et al. FRP strengthened RC structures [M].Chichester:John Wiley & Sons, 2002:31-89.
[2] China Engineering Construction Standardization Association.CECS146 Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate [S].Beijing:China Planning Press, 2003.(in Chinese)
[3] Chajes M J, Thomson T A, Farschman C A.Durability of concrete beams externally reinforced with composite fabrics [J].Constr Build Mater, 1995, 9(3):141-148.
[4] Toutanji H A, Gomez W.Durability characteristics of concrete beams externally bonded with FRP composite sheets [J].Cem Concr Compos, 1997, 19(4):351-358.
[5] Bi Yongqing.Experimental study on resistance to corrosion of RC beams and columns strengthened by CFRP [D].Tianjin:School of Civil Engineering of Tianjin University, 2002.(in Chinese)
[6] Almusallam T H.Load-deflection behavior of RC beams strengthened with GFRP sheets subjected to different environmental conditions [J].Cem Concr Compos, 2006, 28(10):879-889.
[7] Soudki K, Salakawy E E, Craig B.Behavior of CFRP strengthened reinforced concrete beams in corrosive environment [J].J Compos Constr, 2007, 11(3):291-298.
[8] Mukhopadhyaya P, Swamy R N, Lynsdale C J.Durability of adhesive bonded concrete-GFRP joint[C]//Durability of Fiber Reinforced Polymer(FRP)Composites for Construction.Sherbrooke, Canada:1998:373-389.
[9] Sen R, Shahawy M, Mullins G, et al.Durability of carbon fiber reinforced polymer/epoxy/concrete bond in marine environment [J].ACI Struct, 1999, 96(6):906-914.
[10] Hu Anni.Experimental study on durability of FRP strengthening civil engineering structures under load and aggressive environments [D].Dalian:School of Civil and Hydraulic Engineering of Dalian University of Technology, 2007.(in Chinese)
[11] Lu Xiaojun, Zhang Qi, Ma Zhaoqing, et al.Study of hydrothermal aging effect on mechanical properties of carbon fiber/epoxy resin[J].Composites Journal of Materials Engineering, 2005(11):50-57.(in Chinese)
[12] Liu Qizhuo.Flexural performance of different damage reinforced concrete beams strengthened with CFRP sheets [D].Wuhan:School of Civil Engineering and Architecture of Wuhan University of Technology, 2004.(in Chinese)
[13] Bradley W L, Grant T S.The effect of the moisture absorption on the interfacial strength of polymeric matrix composites [J].J Mater Sci, 1995, 30(21):5537-5542.
Memo
- Memo:
-
Biographies: Li Shan(1979—), male, graduate;Huang Chengkui(corresponding author), male, professor, huangck@dlut.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.50608013), Special Prophase Project on Basic Research of the National Department of Science and Technology(No.2004CCA04100).
Citation: Li Shan, Ren Huitao, Huang Chengkui, et al.Durability of concrete beams reinforced with CFRP sheet under wet-dry cycles and loading[J].Journal of Southeast University(English Edition), 2009, 25(3):376-380.