2000 Fiscal Year Final Research Report Summary
Maintenance and Repair System by Cathodic Protection for Post-tension PC Structures under Marine Environment
| Project/Area Number |
11450170
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
土木材料・力学一般
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| Research Institution | Kagoshima University |
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Principal Investigator |
YAMAGUCHI Toshinobu Kagoshima University, Faculty of Engineering, Research Associate, 工学部, 助手 (50305158)
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| Project Period (FY) |
1999 – 2000
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| Keywords | Cathodic Protection / Post-tension / PC Tendon / Monitoring / Marine Environment / Effect of Cathodic Protection |
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| Research Abstract |
(1)In the same current density at the anode, the potential shift of PC tendon in post-tensioned method would be less than that of pre-tensioned method, due to the existence of the sheath.
(2)When the cathodic protection is applied to the steel sheath having the defect due to the corrosion itself, some current flows through the defect and concentrates to a part of inside PC tendon. However, this concentration, which occurs in limited area under the defect, can be considered as profitable phenomenon to avoid the corrosion of PC tendons in the vicinity of the defect.
(3)When the cathodic protection is applied to the steel sheath having the air void inside of it, potential shifts under the void are increasing in PC tendon and decreasing in the sheath. By making use of this phenomenon, it may be possible to propose a non-destructive technique in order to investigate the air-void in the sheath.
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