Investigation for Relationship between Frost Damage Resistance and Air-Void System in Concrete

コンクリートの気泡組織と耐凍害性の関係に関する考察

This study focused on relationship between frost damage resistance and air-void system in concrete. Analysis using 200 concrete experimental data shows that entrained air content in fresh status tend to decrease during hardening process, which appears significant in concrete using fly-ash with moderate heat portland cement. As a result, correlation between durability factor representing frost damage resistance and entrained air content measured after hardening is higher than that measured in fresh status. This tendency is more remarkable in concrete using fly-ash with moderate heat portland cement than using normal portland cement. Spacing factor in concrete does not mean identical air-void size distribution as being affected by entrained air content and specific surface. Hence even with the same spacing factor values, concrete containing air void less than 0.15mm diameter tends to show better frost damage resistance.コンクリートの気泡組織と耐久性指数の相関について約200データを基に分析した。その結果，フレッシュから硬化にかけてコンクリートの空気量は減少し，この傾向は中庸熱フライアッシュセメントの場合に，より顕著であることが確認された。また，コンクリートの気泡間隔係数は，空気量と気泡比表面積のいずれの影響も受けるため，気泡間隔係数の値が同程度であっても気泡分布が大きく異なることがあり，径0.15mm未満の気泡量が多いコンクリートほど耐凍害性が高い傾向にあることが明らかとなった。さらに，本研究のケーススタディの範囲では，径0.03～0.125mmの気泡の増加に伴って気泡間隔係数は小さくなり，径1.125mmの気泡の増加に伴って気泡間隔係数が大きくなったことを示した。

• Record URL:
  https://doi.org/10.3151/crt.23.35
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Investigation+for+Relationship+between+Frost+Damage+Resistance+and+Air-Void+System+in+Concrete&author=N.+Sakata&author=T.+SUGAMATA&author=D.+Hayashi&author=M.+Hashimoto&publication_year=2012
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13404733
• Authors:
  • Sakata, Noboru
  • SUGAMATA, TAKUMI
  • Hayashi, Daisuke
  • Hashimoto, Manabu
• Publication Date: 2012

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 35-47
• Serial:
  • Concrete Research and Technology
  • Volume: 23
  • Issue Number: 1
  • 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: Air voids; Concrete hardening; Concrete tests; Durability; Entrained air; Fly ash; Frost damage; Portland cement
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01515579
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Feb 24 2014 8:43AM