Development of a practical prediction method for concrete deterioration caused by sulfuric acid attack
| Project/Area Number |
18H01511
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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 | Hiroshima University |
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Principal Investigator |
Kawai Kenji 広島大学, 先進理工系科学研究科(工), 教授 (90224716)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2019: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
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| Keywords | コンクリート / 硫酸劣化 / 劣化進行予測 |
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| Outline of Final Research Achievements |
When concrete comes into contact with sulfuric acid and deteriorates, it is found that the degree of deterioration differs due to the difference in the composition of calcium silicate hydrate (specifically, due to the difference in CaO/SiO2 ratio of calcium silicate hydrate), which is a component of cement hydrates in concrete. It is also confirmed that the phenomenon of repeated expansion and spalling of concrete during its sulfuric acid deterioration can be reproduced by modeling the contribution of gypsum produced by the reaction between cement hydrates and sulfuric acid to filling-in of pores in concrete and expansion of concrete.
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| Academic Significance and Societal Importance of the Research Achievements |
コンクリートの硫酸劣化は，下水道関連施設等において顕在化している．これらの施設を維持管理していくにあたり，コンクリートの劣化進行を正確に予測することは，適切な補修時期を設定する根拠となるものであり，施設の維持管理コストを最小限に抑えることに大きく貢献する．本研究の成果は，コンクリートの硫酸劣化の進行予測を行う上で有用な情報を提供するもので学術的意義があり，劣化進行の適切な予測は構造物の長期使用，延命化に資するものであり，社会的意義も大きい．
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Report
(4 results)
Research Products
(6 results)
