Toward Establishing Recommendations for Silicate-based Surface Impregnation Method for Concrete Structures
けい酸塩系表面含浸工法の設計施工指針（案）の概要
In December 2009, the Concrete Committee of the Japan Society of Civil Engineers set up a subcommittee for Study for Silicate-based Surface Impregnation Method for Concrete Structures. With 47 members under chairman Professor Koji Takewaka of Kagoshima University, the subcommittee completed its work in March 2012. Among several surface protection methods, the subcommittee focused its activity on silicate-based penetrants that are able to improve properties of concrete surface layer, to heal cracks and to prevent deteriorations of concrete structures. The main components of silicate-based surface penetrants react with calcium hydroxide which is formed during the process of cement hydration, and form a C-S-H gel in the concrete. The main components used in commercialized penetrants are lithium silicate, sodium silicate, potassium silicate or their mixture. In the actual products, however, it is unusual to find just one of these ingredients; most of the penetrants contain various additives and minor ingredients that aim to stabilize reactivity of main components and to improve their physical properties. However, from an engineering point of view, it is little meaning to categorize silicate-based surface penetrants according to these additives and minor components. The subcommittee, therefore, proposed a classification of surface penetrants into two types that are “Solidifying type” and “Reactive type”, according to improvement mechanisms of the main components on concrete surface.土木学会コンクリート委員会けい酸塩系表面含浸材設計施工研究小委員会では，コンクリート表面保護工法のうち，表面含浸工法に分類されるけい酸塩系表面含浸工法を対象として，この工法によるコンクリート表面の改質，ひび割れ補修あるいは各種劣化に対する抑制のための設計ならびに施工に関する技術指針と，性能評価のための試験方法を制定することを目的とし，活動を行った。けい酸塩系表面含浸材の主成分は，セメントの水和によって生じる水酸化カルシウムと反応し，コンクリート中にC-S-Hゲルを生成させるものである。このようなけい酸塩系表面含浸材の性能をより高く発揮させるには，種類に応じた適切な養生を行うことが重要である。本指針（案）では，けい酸塩系表面含浸材がコンクリートの表層部を改質するメカニズムに応じて，固化型と反応型に分類することを提案し，それぞれの型に応じた施工と養生を行う設計と施工の体系を示した。
- Record URL:
- 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:
- Takewaka, K
- Publication Date: 2012
Language
- English
- Japanese
Media Info
- Media Type: Web
- Pagination: pp 889-895
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Serial:
- Concrete Journal
- Volume: 50
- Issue Number: 10
- 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: Concrete structures; Impregnation (Engineering); Penetrants; Preventive maintenance; Properties of materials; Sodium silicate
- Subject Areas: Bridges and other structures; Maintenance and Preservation; Materials; I32: Concrete; I60: Maintenance;
Filing Info
- Accession Number: 01504187
- Record Type: Publication
- Source Agency: Japan Science and Technology Agency (JST)
- Files: TRIS, JSTAGE
- Created Date: Jan 24 2014 2:27PM