Evaluation Method for Bond-Splitting Behavior of Reinforced Concrete with Corrosion based on Restraint Stress of Concrete against Corrosion Expansion

主鉄筋の腐食膨張挙動に対するコンクリートの拘束圧に基づく付着割裂性状評価

In this study, bond stress behavior of corroded reinforced concrete was investigated by carrying out pull-out tests for RC (reinforced concrete) specimens with different corrosion crack widths. Moreover, restraint stress of concrete was evaluated by expansion simulation using non-explosive demolition agent, and a restraint stress model equation for reinforced concrete with corrosion cracking was proposed. Bond strength was observed to decrease linearly as the restraint stress in the concrete decreases, and the degree of decreases was found to be almost the same regardless of the longitudinal corrosion crack widths at the concrete surface, the cover thickness and the diameter of the reinforcement. Furthermore, using the relationship between the bond strength and restraint stress in concrete, a bond strength model equation and bond-slip relationship model equation were proposed. The predicted values showed generally good agreement with the experimental results of other researchers.本研究では，腐食した鉄筋コンクリート(RC)の付着割裂破壊時の付着応力性状評価を目的として，かぶりコンクリートの腐食ひび割れ幅が異なるRC試験体に対し，片側引抜試験を実施した。また，かぶりコンクリートに腐食ひび割れ幅を有するRCの抵抗性評価を目的として，静的破砕剤を用いた模擬腐食膨張試験を実施し，腐食ひび割れを有するコンクリートの拘束圧算定式を提案した。コンクリートの拘束圧と付着強度の間には，腐食ひび割れ幅，鉄筋径，かぶりによらず一義的な線形関係が認められたことから，拘束圧に基づく付着強度算定式ならびに付着応力-すべり量関係式を提案した。提案した付着評価式は，既往の研究結果と比較的良好な一致を示した。

• Record URL:
  • https://doi.org/10.3151/crt.24.29
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=Evaluation+Method+for+Bond-Splitting+Behavior+of+Reinforced+Concrete+with+Corrosion+based+on+Restraint+Stress+of+Concrete+against+Corrosion+Expansion&author=K.+Nagaoka&author=T.+Abe&author=S.+Banba&author=Y.+Murakami&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13404733
• Authors:
  • Nagaoka, Kazuma
  • Abe, Tetsuo
  • Banba, Shunsuke
  • Murakami, Yuki
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 29-42
• Serial:
  • Concrete Research and Technology
  • Volume: 24
  • Issue Number: 2
  • Publisher: Japan Concrete Institute
  • ISSN: 1340-4733
  • EISSN: 2186-2745
  • Serial URL: https://www.jstage.jst.go.jp/browse/crt/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Bond strength (Materials); Corrosion; Cracking; Evaluation and assessment; Reinforced concrete; Stresses
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01515513
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Feb 24 2014 8:43AM