2023 Fiscal Year Final Research Report
Modeling and re-corrosion evaluation of patch repaired concrete subjecting to chloride attack
| Project/Area Number |
19K04547
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22010:Civil engineering material, execution and construction management-related
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| Research Institution | Saitama University |
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Principal Investigator |
Luan Yao 埼玉大学, 理工学研究科, 助教 (20725288)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | patch repaired concrete / repair materials / chloride migration / crack / multi-scale model / water repellency / corrosion / fiber reinforced mortar |
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| Outline of Final Research Achievements |
The research focuses on evaluating chloride transport and corrosion in patch repaired concrete subjected to chloride attack. Experimental investigations include studies on chloride migration in cracked repair mortars as well as the influence of incorporating supplementary cementitious materials (SCMs) and hydrophobic agents. These experiments evaluate factors such as crack width, repair material type, and surface treatments, revealing significant increase in chloride diffusion with increasing crack width and mitigation effect with SCMs and hydrophobic treatments. Numerical simulations using multi-scale models further explore water ingress and chloride penetration in cracked repair mortars. The obtained chloride amount in repaired concrete is used for evaluation of steel rebar corrosion initiation. The simulations provide insights into the influence of crack pattern on water absorption and chloride distribution, crucial for understanding long-term durability.
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| Free Research Field |
コンクリート材料
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| Academic Significance and Societal Importance of the Research Achievements |
Chloride penetration of patch repaired concrete is more complicated than normal concrete, because more factors are involved. Those factors were thoroughly studied, offering important insights for practice. In addition, the numerical approach considers those factors from academic viewpoints.
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