NON-DESTRUCTIVE EVALUATION OF PERMEABILITY OF COVER CONCRETE BY PROPERTIES OF SURFACE COLOR CHANGE AND WATER FLOW OCCURRED BY WATER SPRAYING

コンクリート表面における散水時の明度変化特性および水の流下特性による表層品質の非破壊評価

The permeability of cover concrete has considerable effect on the durability of reinforced concrete structures, and the importance of the non-destructive evaluation on the mass transfer resistance of cover concrete has become increasingly important in recent years. In this study, the authors proposed an evaluation method which is simple and easily applicable to the inspection of concrete structures, by focusing on the change of surface color of concrete in wet condition and the water flow phenomenon on vertical plane. As a result, it was clarified that the change over time of the brightness and the flow length of water that caused by the water spraying have different characteristics according to the concrete qualities. Based on these results, several indicators obtained by the proposed method have a potential to be available for simple evaluation of the surface mass transfer resistance.鉄筋コンクリート構造物の耐久性に大きく影響するコンクリート表層部の物質移動抵抗性に関する非破壊評価の重要性が高まっている。本研究では、実構造物の検査への適用が容易な簡便性に優れた手法として、コンクリート表面へ意図的に少量の水を散水した際の表面色の変化および鉛直面における水の流下現象に着目した方法を考案した。散水後の吸水・乾燥過程で生じるコンクリート表面における明度の経時変化特性、ならびに、鉛直面への散水時に観測される水の流下距離は、各種品質のコンクリート試験体で大きく異なることを明らかにした。本手法で得られる複数の指標により、表層部の物質移動抵抗性を非破壊で簡易に評価できる可能性がある。

• Record URL:
  https://doi.org/10.14250/cement.66.303
• Record URL:
  https://www.jstage.jst.go.jp/article/cement/66/1/66_303/_pdf
• 
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=NON-DESTRUCTIVE+EVALUATION+OF+PERMEABILITY+OF+COVER+CONCRETE+BY+PROPERTIES+OF+SURFACE+COLOR+CHANGE+AND+WATER+FLOW+OCCURRED+BY+WATER+SPRAYING&author=S.+NISHIO&author=H.+UEDA&author=T.+KISHI&publication_year=2012
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • NISHIO, Sohei
  • UEDA, Hiroshi
  • KISHI, Toshiharu
• Publication Date: 2012

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 303-310
• 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: Brightness; Concrete structures; Durability; Flow measurement; Nondestructive tests; Permeability; Reinforced concrete; Sprays (Materials)
• Subject Areas: Bridges and other structures; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01522830
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Apr 24 2014 11:44AM