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Study on mechanism of frost damage of offshore concrete based thermo analytical hehavior

Research Project

Project/Area Number 14550459
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionKitami Institute of Technology

Principal Investigator

AYUTA Koichi  Kitami Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (90003186)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsMechanism of frost damage / Scaling / Freezing-thawing action / Cooling rate / Minimum temperature / Water cement ratio / Offshore concrete / 最低温度保持時間 / 海水 / 凍結速度
Research Abstract

The results of this study indicates the following :
It is well known that concrete undergoes significant deterioration when exposed to sea water and frost in cold regions. In order to clarify the effects of freezing-thawing action on the scaling of concrete exposed to sea water, we performed freezing and thawing tests on specimens immersed in either sea water or fresh water. The tests were performed at various cooling rates and the minimum temperatures. We also used specimens of different water to cement ratios.
Scaling occurred when we used specimens soaked in sea water. Scaling occurred more on specimens that had high water to cement ratio, slowly cooling rate and more at low minimum temperature. The experiment of the results showed that sea water entered into cement paste matrix that had high water to cement ratio. At low minimum temperatures. sea water entered into cement paste matrix. Cement paste matrix was filled with sea water, which caused scaling. The specimens showed more scaling when the water was slowly cooled to the freezing point. Experiment results of these specimens showed that the sea water had entered the cement paste matrix. Therefore, scaling occurs when the water cools slowly and then remains for a long time.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 加藤利菜, 鮎田耕一, 猪狩平三郎: "海水の作用を受けるコンクリートの凍結速度がスケーリングに及ぼす影響について"土木学会北海道支部論文報告集. No.59. 812-813 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 加藤利菜, 鮎田耕一, 猪狩平三郎: "セメントペーストマトリックスへの海水の浸入がスケーリングに及ぼす影響"セメントコンクリート論文集. No.57. 279-284 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 加藤利菜, 鮎田耕一, 猪狩平三郎: "海水の作用を受けるセメントペーストマトリックスの凍結挙動がスケーリングに及ぼす影響について"土木学会北海道支部論文報告集. No.60. 736-737 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Rina Katoh, Koichi Ayuta, Heizaburoh Igari: "Effect of Freeze Rate of Concrete Subjected to Sea Water on scaling"Proceedings of Hokkaido Chapter of the JAPAN Society of Civil Engineers. No.59. 812-813 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Rina Katoh, Koichi Ayuta, Heizaburoh Igari: "Effects of Sea Water in Cement Paster Matrix on Scaling"Cement Science and Concrete Technology. No.57. 279-284 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Rina Katoh, Koichi Ayuta, Heizaburoh Igari: "Effect of Freeze Behavior of Cement Paste Matrix Subjected to Sea Water on Scaling"Proceedings of Hokkaido Chapter of the JAPAN Society of Civil Engineers. No.60. 736-737 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 加藤利菜, 鮎田耕一, 猪狩平三郎: "海水の作用を受けるコンクリートの凍結速度がスケーリングに及ぼす影響について"土木学会北海道支部論文報告集. No.59. 812-813 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 加藤利菜, 鮎田耕一, 猪狩平三郎: "セメントペーストマトリックスへの海水の浸入がスケーリングに及ぼす影響"セメント・コンクリート論文集. No.57. 279-284 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 加藤利菜, 鮎田耕一, 猪狩平三郎: "海水の作用を受けるセメントペーストマトリックスの凍結挙動がスケーリングに及ぼす影響について"土木学会北海道支部論文報告集. No.61. 736-737 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 加藤 利菜: "細孔中の海水の凍結がモルタルのスケーリングに及ぼす影響について"寒地技術論文・報告集. 18. 245-249 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 加藤 利菜: "海水の作用を受けるコンクリートの凍結速度がスケーリングに及ぼす影響について"土木学会北海道支部論文報告集. 59. 812-813 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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