1991 Fiscal Year Final Research Report Summary
海洋環境下における鉄筋コンクリート構造物の耐久性評価および環境条件評価
| Project/Area Number |
01850108
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
コンクリート工学・土木材料・施工
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NAGATAKI Shigeyoshi Tokyo Institute of Technology, Civil engineering, Professor, 工学部, 教授 (00016320)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUTE Tsutomu The Port & Harbor Research Institute, Ministry of Transport, Chief of Materials, 室長
OTSUKI Nobuaki Tokyo Institute of Technology, Civil Engineering, Associate Professor, 工学部, 助教授 (40211106)
DAIMON Masaki Tokyo Institute of Technology, Inorganic Materials, Professor, 工学部, 教授 (10016579)
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| Project Period (FY) |
1989 – 1991
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| Keywords | Exposure tests / Standard specimens / Corrosion of steel bars / Chloride ion / Evaluation of environmental conditions / Marine environments |
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| Research Abstract |
The durability of reinforcec concrete structures in various marine environments were investigated, and the following results are obtained.
1. The process in which C1^- penetrates into concrete and destroys the passivation of embedded steel bars were examined. It was clarified that the influence of external C1^- was greater than that of internal C1^- and the binding of C1^- was clos13EA\ : ely related to the formation of Friedel's salt.
2. It was experimentally shown that the penetration of C1^- and O_2 was fast with the existence of cracks or joints. The influencess of cracks and joints on the formation of macro-cell were also shown.
3. The deterionation of the standard specimens (dia. 5 X 10cm : cylinder specimens) in 19 ports in Japan was examined, and the feasibility of the evaluation of the marine conditions with standard specimes were shown.
4. For the detereoration of the standard specimens the influences of the length of the fetch, existence of breakwaters and water backlash were shown to be very large.
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