| Project/Area Number |
07650667
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
OSHIRO Takeshi University of the Ryukyus Dept. of Civil Engineering and Architecture, Professor., 工学部, 教授 (30045033)
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| Co-Investigator(Kenkyū-buntansha) |
YAMADA Yoshitomo University of the Ryukyus Dept. of Civil Engineering and Architecture, Instructo, 工学部, 助手 (80220416)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Evaluation on chloride attach environment / Chloride-ion penetration / Accumulated Chloride-ion / Analytical method for diffusion equation / 塩分浸透 / 非破壊評価 |
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| Research Abstract |
Evaluation on chloride attach environment.
In order to quantify air-laden chloride which are the main cause of chloride attach to concrete structures, chloride ions and their vertical distributions are measured at various sea-shores. Also, the weather data from the Okinawa Weather Bureau are used to investigate relation between chloride ions and wind velocity. The quantify and the distributions of air-laden chlorides are considered as boundary conditions, and the transportation equation of chlorides are analyzed by F.E.M.. Evaluating the results, new technique for estimating air-laden chlorides at different locations from seashore is proposed.
Distribution of chloride ions indicating evaluation index of deterioration.
The process of chloride penetration and distribution of chlorides in concrete are investigated. These are considered to give the great influence on steel corrosion and its development. Two test structures exposed for 7 and 12 years are used for investigating the characteristics of deterioration. Evaluation the test results, new analytical method for the diffusion equation is proposed, where the influences from air-laden chlorides, carbonation of concrete, water cement ratio (w/c) and time are considered. By using the proposed method, the distributions of chloride content at various locations under chloride environment are estimated. The analytical results are compared with the filed data and it is concluded that the proposed method gives the excellent results and represents characteristics of real phenomenon.
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