2021 Fiscal Year Final Research Report
Mass transfer prediction model in unsaturated concrete based on electrochemical physical properties
| Project/Area Number |
19K04545
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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 | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
宮本 慎太郎 東北大学, 工学研究科, 助教 (60709723)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | コンクリート / 塩害 / 電気抵抗率 / 含水率 / 塩化物イオン浸透 |
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| Outline of Final Research Achievements |
Prediction of chloride ion concentration at rebars is important for estimating the lifetime of concrete structures. In order to construct a chloride ion penetration prediction method for unsaturated concrete based on multiple electrochemical quantities, a non-destructive evaluation method for the water content distribution inside concrete by electrical resistance tomography, which is an elemental technique for the prediction method, was produced. As a result, it was shown that the water content distribution can be evaluated non-destructively from the surface potential distribution generated when applying current. In addition, we investigated the mutual similarity between the conductivity and the water content dependence of the diffusion coefficient for the chloride ion diffusion coefficient of unsaturated concrete, which was difficult to evaluate by the conventional test method. As a result, it was shown that there are environmental conditions that can confirm the mutual similarity.
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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 |
従来の不飽和コンクリート中のCl-浸透予測は高度な数値解析・物性評価技術を要する．本研究は，不飽和コンクリートのCl-拡散係数は電気化学的試験により直接評価し，水の浸潤速度・移流層深さの評価方法を電気化学的非破壊試験で評価し，これらを統合する点が独創的である．高度な数値解析的手法では，ミクロ的視点の材料パラメータを膨大に取得する必要があり，設計にかかるコストおよび不確実性が大きい．一方，本方法は，マクロな電気化学的諸量の実験的エビデンスに基づきCl-拡散係数およびCl-浸透を定量するものであるため，コスト低減・確実性の向上が図られ，新材料の遮塩性の評価にも展開できる創造性・発展性を有する．
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