INFLUENCE OF ACCUMULATION OF INVOLVED OR PENETRATED CHLORIDE ION ON SCALING RESISTANCE IN CONCRETE SUBJECTED TO FREEZE-THAW CYCLES

内在塩あるいは外来塩の蓄積がコンクリートのスケーリング抵抗性に及ぼす影響

It is known that spraying of NaCl, which is de-icing salt, is accelerated a scaling deterioration to concrete surface. On the other hand, concrete structures are assumed to be subjected under freeze-thaw cycles in condition that is accumulated involved or penetrated chloride. However,. clear explanation has not been made about scaling deterioration under this condition. The aim of this study is to investigate the influence of accumulation of involved or penetrated chloride on scaling resistance in concrete subjected to freeze cycles experimentally. Seven types of specimens that varied the chloride ion concentration near the testing surface were prepared. Then, the scaling deterioration of these specimens under freeze-thaw cycles was investigated according to ASTM C672. The experimental results revealed that the scaling deterioration of Non-AE concrete, which was accumulated of involved or penetrated chloride, was increased than plain Non-AE concrete. Further, it was clarified that frost durability of Non-AE concrete was reduced markedly by the highly concentrated chloride ion near the concrete surface.凍結防止剤としてNaClが散布されるとコンクリートのスケーリングを促進することが知られている。一方、実コンクリート構造物は内在塩あるいは外来塩が蓄積された状態で凍結融解作用を受けることが考えられるが、この種の条件下におけるコンクリートのスケーリング抵抗性については未解明な点が多い。そこで本研究では、凍結融解試験に先立ち内在塩あるいは外来塩を蓄積させた供試体を準備し、試験面表層の塩分濃度がスケーリングに及ぼす影響を評価した。その結果、スケーリングは、凍結防止剤を含む水による凍結融解作用によって、Non-AEコンクリートでかつ内在塩が蓄積する場合と、高濃度の外来塩が蓄積する場合に、塩分が蓄積しない場合に比べ顕在化することを明らかにした。

• Record URL:
  • https://doi.org/10.14250/cement.66.422
• Record URL:
  • https://www.jstage.jst.go.jp/article/cement/66/1/66_422/_pdf
• 
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=INFLUENCE+OF+ACCUMULATION+OF+INVOLVED+OR+PENETRATED+CHLORIDE+ION+ON+SCALING+RESISTANCE+IN+CONCRETE+SUBJECTED+TO+FREEZE-THAW+CYCLES&author=Y.+KODA&author=M.+SAKUMA&author=I.+IWAKI&publication_year=2012
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • KODA, Yasuhiro
  • SAKUMA, Masaaki
  • IWAKI, Ichiro
• Publication Date: 2012

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: pp 422-428
• Serial:
  • Cement Science and Concrete Technology
  • Volume: 66
  • Issue Number: 1
  • Publisher: Japan Cement Association
  • ISSN: 0916-3182
  • EISSN: 2187-3313
  • Serial URL: https://www.jstage.jst.go.jp/browse/cement/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Chloride content; Deicing chemicals; Deterioration; Durability; Freeze thaw tests; Frost damage; Scaling (Concrete)
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01522665
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Apr 22 2014 4:07PM