| Project/Area Number |
19K15074
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
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| Research Institution | Kyushu University |
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Principal Investigator |
Yang Muye 九州大学, 工学研究院, 特任助教 (70836519)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | galvanic corrosion / CFRP / adhesion / thermal analysis / durability / mechanics / Composite structure / Galvanic corrosion / Thermal properties / Mechanical properties / Environmental durability / Adhesive strength / Durability / Atmospheric environment / Moisture diffusion / Structural engineering |
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| Outline of Research at the Start |
The research aims to investigate the galvanic corrosion mechanism of CFRP strengthened steel structures under atmospheric environment. Typical atmospheric environments would be assessed, by evaluating the adhesive failure and galvanic corrosion behaviors of CFRP-steel bonding system in field tests. With considering the compound effects of multiple coupling factors, the targeted anti-corrosion technique for CFRP strengthened steel structure could be developed. Finally, durability prediction would be carried out combined with the update of safety criteria for CFRP strengthened steel structures.
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| Outline of Final Research Achievements |
The study focused on the CFRP strengthening technique applied to the corroded steel structures, committed to improving the environmental durability of adhesion interface and composite joint. It was aimed to evaluate the bond behavior and galvanic corrosion mechanism of the CFRP-steel bonding system through comprehensive research methods. Firstly, mechanical and thermal analysis optimized the curing condition and other variables during fabrication. Secondly, the moisture and thermal effects on the deterioration of CFRP-steel adhesive joint were discussed by conducting aging tests. Meanwhile, the conventional rust removal methods were studied by clarifying the physical and chemical characteristics of steel surfaces. Finally, an electrolytic film thickness measuring device was developed to simulate the atmospheric environment. The test results show that the water film and immersion environments can cause different corrosion rates and anodic zone.
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| Academic Significance and Societal Importance of the Research Achievements |
The present experimental results provide new insights regarding the interfacial bond mechanism between corroded steel structures and adhesive or CFRP composites to enhance their capability for use in aging steel structures in various fields.
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