| 研究課題/領域番号 |
19K04547
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| 研究種目 |
基盤研究(C)
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| 配分区分 | 基金 |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分22010:土木材料、施工および建設マネジメント関連
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| 研究機関 | 埼玉大学 |
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研究代表者 |
欒 堯 埼玉大学, 理工学研究科, 助教 (20725288)
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| 研究期間 (年度) |
2019-04-01 – 2024-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
4,420千円 (直接経費: 3,400千円、間接経費: 1,020千円)
2021年度: 1,300千円 (直接経費: 1,000千円、間接経費: 300千円)
2020年度: 1,820千円 (直接経費: 1,400千円、間接経費: 420千円)
2019年度: 1,300千円 (直接経費: 1,000千円、間接経費: 300千円)
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| キーワード | patch repaired concrete / chloride / water repellency / crack / corrosion / multi-scale model / chloride migration / blast furnace slag / water repellent agent / water penetration / silica fume / repair mortar / electrophoresis / capillary absorption / SHCC / repair materials / simulation / polymer cement / chloride attack / multi-scale modeling |
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| 研究開始時の研究の概要 |
Patch repair is the mostly used method for repairing concrete subject to chloride attack. However, re-corrosion of the repaired concrete in short time is often reported because of inappropriate treatment. This study will focus on establishing an approach of modeling and evaluation of patch repaired concrete. Key factors, for example, chloride transport and the natural potential difference between the old concrete and the repaired part, will be studied. Their effects will be integrated into chloride transport and corrosion models for reasonably evaluating the risk of re-corrosion.
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| 研究実績の概要 |
In FY2022, water penetration and chloride migration of repair materials that were treated with water repellent agents, as well as their shrinkage and strength properties, were studied experimentally. The results indicated that the combination of hydrophobic treatment with repair materials effectively improved water and chloride penetration resistance under cracked conditions. Shrinkage was also reduced for treated repair materials, but the reduction of strength still remains an issue that needs to be solved in the future. In addition, bond strength of repair material and concrete substrate was also tested with different interfacial treatment and concrete removal technology. For the steel corrosion of patch repaired concrete, the influence of crack width in repair materials has also been tested. It was found that corrosion degree increased with increasing crack width, which accelerated chloride penetration significantly.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The progress of experimental and analytical studies on water and chloride penetration of patch repaired concrete followed the research plan. Regarding the corrosion of steel bars in patch repaired concrete, the experiment work was late in last fiscal year because of the Covid-19. In this year, the corrosion test has been started and the progress generally followed the plan.
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| 今後の研究の推進方策 |
In the FY2023, steel corrosion test of patch repaired concrete will be continued for including more factors such as temperature and relative humidity as well as repair material type. Comparison between the test and numerical analysis will also be performed.
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