Development of Durability Enhancement Technique for Concrete by Continuous Drain-Moist Curing

排水・湿潤連続養生によるコンクリートの耐久性向上技術

With the aim of developing a technique that improves the durability of concrete through curing, a curing method that allows, through the use of a newly developed special form, the discharge of excess water and air bubbles from concrete immediately after it has been placed, and moist curing through rapid water supply after it sets, as a continuous operation without demolding. Along with establishing standard construction methods through trials using large members simulating wall rails, durability tests were performed, confirming various curing effects such as reduction of surface air permeability, inhibition of carbonation, and inhibition of chloride ingress. Further, the effects of this technique in actual structures were demonstrated through application to reinforced concrete (RC) bridge wall rails. This paper reports also on the study of new methods for supplying water to further expand the range of applications of the proposed curing technique.養生によるコンクリートの高耐久化技術の開発を目的として，新規に開発した特殊な型枠を用いることで，打込み直後のコンクリートの余剰水や気泡の排出と凝結後の速やかな給水による湿潤養生を，脱型せずに連続で行うことができる養生方法を開発した。壁高欄を模擬した大型部材の試験施工により標準的な施工方法を確立するとともに，耐久性試験を実施して表層の透気係数の低減，中性化の抑制，塩分浸透の抑制などの養生効果を確認した。加えて，橋梁の高欄壁に適用し，実構造物においてその効果を実証した。併せて，今後の養生方法の適用拡大へ向けた新たな給水方法の検討結果について報告する。

• Record URL:
  https://doi.org/10.3151/coj.53.867
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Development%20of%20Durability%20Enhancement%20Technique%20for%20Concrete%20by%20Continuous%20Drain-Moist%20Curing&author=T.%20Usui&author=S.%20Miyahara&author=J.%20Sakamoto&author=T.%20Kishi&publication_year=2015
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03871061
• Authors:
  • Usui, T
  • Miyahara, S
  • Sakamoto, J
  • Kishi, T
• Publication Date: 2015

Language

• English
• Japanese

Media Info

• Media Type: Web
• Pagination: pp 867-873
• Serial:
  • Concrete Journal
  • Volume: 53
  • 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: Bridge railings; Bridges; Bubbles; Concrete curing; Durability; Moisture content; Permeability; Reinforced concrete; Water
• Subject Areas: Construction; Highways; Materials;

Filing Info

• Accession Number: 01614712
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Oct 25 2016 10:00AM