| Project/Area Number |
11450167
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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 | HOKKAIDO UNIVERSITY |
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Principal Investigator |
SAEKI Noboru Hokkaido University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (80002004)
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| Co-Investigator(Kenkyū-buntansha) |
SAKURAI Hiroshi Kitami Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80187088)
MIKAMI Takashi Hokkaido University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (00002303)
HORIGUCHI Takashi Hokkaido University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (30094816)
SATO Masashi Hokkaido Development Bureau, Civil Engineering Research Institute, Head of Sturctural Engineering Section, 構造研究室, 室長(研究職)
SHOYA Masami Hatinohe Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80006684)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2000: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1999: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | Diagnosis / Preservation / Strengthening / Thermal Analysis / Non-Destructive Test / Freeze-Thaw / 補修・補強 / ドリル / 掘削試験 |
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| Research Abstract |
The purpose of this study is initiated to diagnose the situation and develop preservation and strengthening systems for concrete structures in cold region.
Actual structures were investigated to consider diagnosis method. Items in place assessment were visual inspection, velocity measurement of ultra sonic, non-destructive strength estimation by Schmidt hammer, depth of carbonation and thickness of cover concrete. The result of this investigation shows the deterioration of concrete structures is evaluated by these non-destructive tests.
Excavation test by the drill was carried out for the purpose of estimating the deterioration of depth direction. As the result, the power expressed by the product of drilling speed and the force showed high correlation with the concrete strength.
As predicted number of freeze-thaw cycles by thermal analysis corresponds to the strength of non-destructive tests, these tests will be able to apply for the prediction of service life, repairing and strengthening design.
Tests for permeability, chloride content, pH and strength are major test methods for the durability assessment. These tests form a system of the diagnosis for concrete structures.
The strengthening methods such as painting(surface coating), FRP sheet bonding and external cable are investigated and the effect of strengthening are evaluated, respectively.
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