2022 Fiscal Year Final Research Report
Development on technology to restrain re-deterioration by removing moisture of ASR deterioration concrete structure
| Project/Area Number |
20K04645
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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 | Toyama Prefectural University |
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Principal Investigator |
Ito Hajime 富山県立大学, 工学部, 教授 (10553133)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | コンクリート / アルカリシリカ反応 / 劣化抑制対策 / 除湿 / 湿気移動 / 強度回復 / 収縮 |
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| Outline of Final Research Achievements |
This research is intended for the alkali silica reaction (ASR) which is the problem in the maintenance of the concrete structures of the Hokuriku districts. This research proposed the deterioration preventive method [the dehumidification method] that remove water from expansive gel with humidity decrease. In this research, three problems were examined.
(1) In evaluation of the ASR expansion restraint, it was confirmed that the shrinkage strain was controlled by the low humidity, and that the compressive strength increased. (2) In establishment of the dehumidification method, it was confirmed that the dehumidification effect of the method by the ventilation was higher than the materials to dehumidify, and the moisture movement properties were suggested to use for analysis. (3) In establishment of the humidity management, the validity of moisture movement properties was examined, and it was shown that humidity of bridge pier model was decreased to the target humidity in 2.1 years.
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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 |
劣化防止策の開発にあたり、3つの課題を検討した。①ASR膨張抑制の評価では、コンクリート内部の湿度低下による収縮量や力学性能について各種要因が与える影響を明らかにするとともに、それらの変化を定量的に評価した。②除湿法の確立では、除湿法ごとの湿気移動特性を確立するとともに、内部乾燥によるコンクリートひずみの変化も評価した。③湿度管理法の確立では、湿気移動特性の妥当性を示し、解析を用いた実構造物モデルの設計法を提示した。
本研究の成果から、実構造物に【除湿法】を実施する場合に、その設計法が適用可能になるとともに、その効果を内部湿度、収縮量、力学性能の変化として把握することが可能になる。
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