1999 Fiscal Year Final Research Report Summary
Study on Development of Rehabilitation Systems for Reinforced Concrete Slabs
| Project/Area Number |
10650446
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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 |
土木材料・力学一般
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| Research Institution | AKITA UNIVERSITY |
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Principal Investigator |
KAWAKAMI Makoto Department of Civil and Environmental Engineering, Faculty of Engineering and Resource Science, Akita University, Professor, 工学資源学部, 教授 (90006693)
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| Co-Investigator(Kenkyū-buntansha) |
OMATA Fujio Engineering Department, Hokuriku Branch, SHO-BOND Corporation, Manager of Technology, 北陸支店, 技術課長(研究職)
TOKUSHIGE Hidenobu Department of Civil and Environmental Engineering, Faculty of Engineering and Resource Science, Akita University, Lecturer, 工学資源学部, 講師 (80291269)
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| Project Period (FY) |
1998 – 1999
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| Keywords | Concrete slab / Snowy and cold region / Durability / Exposure test / Polymer mortar / Setting shrinkage / Bonding steel plate / Repairing and reinforcement |
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| Research Abstract |
1) The observation survey of reinforced concrete slabs (RC slabs) in service in the north-east district of Japan corresponding to the typical snow and cold region was performed first. Based on the survey results, the factors of deterioration of RC slabs were classified into the following four group: a) Materials b) Construction c) Structures d) Surrounding Conditions.
2) Countermeasures for the deteriorated RC slabs were investigated. The proposed methods are described as follows ; a) Crack injection b) Bonding steel plate c) Bonding carbon fiber sheets d) Installation of additional stringer e) Increasing the deck thickness.
Some characteristics of polymer mortars as repair and restoration materials were clarified. Particularly the setting shrinkage stress and deformation of the repaired concrete members due to polymer mortars were main subject of this part.
3) Cover depth of RC slabs more than 70 mm and the epoxy polymer coating over the surface of RC slabs were effective to protect the reinforcing bars from severe condition such as salt attack, and freezing and thawing.
4) Service life and functions of RC slabs should be always compare and balanced. Life cycle cost is also an important factor at the construction of new concrete structures from the view point of environmental problem. Rehabilitation systems of RC slabs considering above factors and conditions were proposed.
5) All results of two years from 1998 to 2000 were summarized and the repot was completed.
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