Repair Performance of Re-injecting of LiNO₂-containing Solution and Grout into Incomplete Grouting Area and Its Example of Application to an Actual PC Bridge
亜硝酸リチウムを用いたPCグラウト充てん不足部の新しい補修方法の腐食抑制効果と実橋への適用事例
In some PC Bridges, incomplete groutings, like poor procedures, poor mixtures and so on, formed the voids in the post-tensioning duct. The PC tendons suffered corrosion damages due to chloride ions invaded into the voids in the area spraying antifreezing agent in winter season. The authors proposed re-injecting of LiNO₂-containing solution and grout recently as a new countermeasure against the voids and corrosion of PC tendons. In this paper, The experiment with concrete specimens in order to verify repair performance of this method and its example of application to an actual PC bridge are introduced.近年，ポストテンション方式の既設PC橋におけるグラウト充てん不足部に，凍結防止剤に起因するCl<sup>-</sup>が侵入し，構造安全性を確保する上で重要なPC鋼材において腐食や破断が報告されている。そこで，筆者らはこれらの腐食したPC鋼材に対して，亜硝酸リチウム水溶液の注入と亜硝酸リチウム添加補修材の充てんによる新しい補修方法を提案した。本稿では，本補修方法の腐食抑制効果実験の概要と実橋への適用事例について紹介する。
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- Summary URL:
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/03871061
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Authors:
- Kamotani, T
- Ebina, T
- Aoyama, T
- Morikawa, H
- Publication Date: 2012
Language
- English
- Japanese
Media Info
- Media Type: Web
- Pagination: pp 1084-1091
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Serial:
- Concrete Journal
- Volume: 50
- Issue Number: 12
- Publisher: Japan Concrete Institute
- ISSN: 0387-1061
- EISSN: 2186-2753
- Serial URL: https://www.jstage.jst.go.jp/browse/coj
Subject/Index Terms
- TRT Terms: Corrosion; Grout; Lithium compounds; Posttensioning; Prestressed concrete bridges; Repairing; Tendons (Materials); Winter maintenance
- Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; I60: Maintenance;
Filing Info
- Accession Number: 01504175
- Record Type: Publication
- Source Agency: Japan Science and Technology Agency (JST)
- Files: TRIS, JSTAGE
- Created Date: Jan 24 2014 2:27PM