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Test Research on Chloride Ions Attack of Coastal Concrete Structure Reinforced by CFRP(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2008年03期
Page:
1-5
Research Field:
Publishing date:
2008-09-20

Info

Title:
Test Research on Chloride Ions Attack of Coastal Concrete Structure Reinforced by CFRP
Author(s):
ZHAO Guo-fan1;  CHEN Feng-shan2;  GAO Chao2
1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China; 2. School of Civil Engineering, Dalian Fisheries University, Dalian 116023,Liaoning, China
Keywords:
carbon fiber reinforced polymer;  chloride ion;  obstructing function;  system of corrosion prevention;  residual durability life
PACS:
TU528.33
DOI:
-
Abstract:
The function that carbon fiber reinforced polymer(CFRP)bonded externally prevents effectively chloride ions from entering concrete was confirmed by two groups of laboratory accelerated penetration tests. The effectiveness of CFRP material to prevent chloride ions was confirmed by tests of type 1; and similar conclusion was also drawn in the test of type 2 when CFRP externally bonded on concrete specimens. Test results show that, for coastal concrete structures, there is not only function of strengthening of CFRP, but also that of preventing chloride ions from penetrating into concrete, and consequently to prolong the initiation period of rebars corrosion. It is also confirmed by test that there is similar function of CFRP and coating on the surface of concrete to shield concrete against chloride ions. Therefore, it is suggested that CFRP bonded externally and coating or other surface prevention measures are applied jointly to form an integrated surface prevention system when CFRP is applied in strengthening coastal concrete structures. Considering the limitation involving with time of the effective shielding function of CFRP, an equation used for residual lifetime prediction of concrete structures bonded externally with CFRP is derived from Fick's dispersion law. Overall, the conclusion may be used for reference when CFRP is applied to strengthen coastal concrete structures.

References:

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Memo

Memo:
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Last Update: 2008-09-20