2023 Fiscal Year Final Research Report
Elucidation of Sulfate Degradation Mechanisms Suspected to be Involved in C-S-H and Organization of Risk Criteria
| Project/Area Number |
19H02208
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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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| Review Section |
Basic Section 22010:Civil engineering material, execution and construction management-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
皆川 浩 東北大学, 工学研究科, 准教授 (10431537)
斎藤 豪 新潟大学, 自然科学系, 准教授 (90452010)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 硫酸塩劣化 / Thaumasite / Ettringite / 熱力学的相平衡計算 |
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| Outline of Final Research Achievements |
Although thaumasite is not easily precipitated in concrete, once precipitated, it reduces the durability of the structure by weakening the cement structure.However, the mechanism of thaumasite precipitation is still unclear, and no technology has yet been established to control it.
In this study, we aimed to elucidate the mechanism of thaumasite precipitation. The results suggest that the precipitation of thaumasite may be affected by the decrease in pH of the pore solution in concrete due to the penetration of magnesium into the system.
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| Free Research Field |
コンクリート工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究ではthaumasiteの析出メカニズムを検討し，系内へのマグネシウムの浸透が特にthaumasiteの析出に影響を及ぼしていることを，実験および数値計算の両方面から明らかにすることができた．実験と数値計算の両方面からのメカニズムの解明は信頼性が高く，マグネシウムがthaumasiteの析出に影響を及ぼしていることは強く支持して良いと考えられる．
さらには，この結果に基づけば，thaumasiteの析出が起こり易い環境も事前に特定し易くなるため，構造物の維持管理にも役立たせることができると考えている．
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