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Development and Evaluation of High-durable Concrete in Ice Sea Region

Research Project

Project/Area Number 08555106
Research Category

Grant-in-Aid for Scientific Research (A)

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

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) SAKAI Koji  Hokkaido Development Bureau, Civil Engineering Research Institute, 開発土木研究所, 部長
SAKURAI Hiroshi  Faculty of Engineering, Associate Professor, 工学部, 助教授 (80187088)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥8,900,000 (Direct Cost: ¥8,900,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsConcrete / Frost Resistance / Ice Sea Region / Evaluation of Durability / Mechanism of Frost Damage / Exposure Test / Antiwashout Underwater Concrete / Plastic Micro-spheres / 促進試験 / 劣化予測 / 信頼性モデル / 凍結機構
Research Abstract

1. Mechanism of Frost Damage of Concrete Effected by Seawater
According to differential scanning calorimetry, the endothermic curve of specimens immersed in seawater is broader than that of specimens in fresh water. The thaw temperature distribution of specimens in seawater widens with time.
A specimen immersed in sea water has greater number of pores of size several ten to thousand nm as aging proceeds. The total pore volume is also much higher, so the amount of frozen water increases in the case of sea water.
These indicates that concrete immersed in seawater is easily subject to frost damage.
2. Deterioration Prediction of Concrete by Reliability Theory
To examine deterioration prediction of concrete structure by reliability theory, we analyze the data of concrete specimens during rapid freeze-thaw tests and exposure tests, and mortar specimens during tensile strength tests.
From these examinations, we conclude that when the water cement ratio is low, the reliability is high. The service … More life and repair plan of concrete structures can be estimated as time on index of reliability 75%, 95%, etc.
3. Frost Resistance of Antiwashout Underwater Concrete
It is difficult to form a suitable air-void system in concrete in which air-entraining agents and sonic special admixture, such as antiwashout admixtures containing cellulose, are used together.
We have introduced plastic micro-spheres (EPM) instead of air-entraining agents to improve the frost resistance of antiwashout underwater concrete with cellulose ether as an antiwashout admixture. As a result, frost resistance of concrete is improved with the addition of 1.0% EPM and 60% blast-furnace slag with fineness of 8000 g/cmTAU12@E1
4. Deterioration of Large Concrete Specimens Exposed to Seawater in Cold Climate
About fifty large specimens, each have about two or three tf in weight, have been exposed at the seashore in Hokkaido Island, Japan for ten years to clarify the effect of materials, mix proportions and others on the frost damage.
The degree of the scaling is different by the parts or the mix proportions of specimens. The scaling occurred severely at the position of the specimens which were exposed to more freezing and thawing cycles or were at high degree of saturation. Less

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] 鮎田 耕一: "中空微小球添加水中不分離性AEコンクリートの耐凍害性" セメント・コンクリート論文集. 50. 440-445 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 桜井 宏: "Analysis and Consideration on results of Long-term mortar strength test" 北見工業大学研究報告. 28・2. 85-98 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 桐生 宏: "積雪寒冷地における海洋コンクリート構造物の耐凍害性向上について" 寒地技術論文・報告集. 13. 231-236 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 王 欣: "Mechanism of Frost Damage on Concrete Affected by sea water" The Proc. of the 4th Beijing Int. Symp. on Cement and Concrete. 4. 411-416 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 七海 隆之: "中空微小球と高炉スラグ微粉末の使用による水中不分離性コンクリートの耐凍害性及び強度性状改善" セメント・コンクリート論文集. 52. 362-367 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 王 欣: "海水の作用を受けるコンクリートの凍結水量と細孔構造" セメント・コンクリート論文集. 52. 684-691 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] AYUTA,K.et al.: "Frost Resistance of Antiwashout Underwater Concrete Containing Expanded Plastic Microspheres" JCA Proc.of Cement and Concrete. No.50. 440-445 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] SAKURAI,H.et al.: "Analysis and Consideration on Results of Long Term Mortar Strength Test" Memoirs of the Kitami Institute of Technology. Vol.28, No.2. 85-98 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kiryu, H.et al.: "Frost Resistance of Marine Concrete in Cold Regions" Proc.of the Conf.of Cold Region Technology. Vol.13. 231-236 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wang, X.et al.: "Mechanism of Frost Damage Concrete Affected by Seawater" Proc.of the Beijing Int.National Symp.on Cement and Concrete. Vol.4. 411-416 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Nanaumi, T.et al.: "Improvement of Frost Resistance and Strength of Antiwashout Underwater Concrete using Plastic Micro-spheres and Blast-Furnace Slag" JCA Proc.of Cement and Concrete. No.52. 362-367 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Wang, X.et al.: "Amount of Frozen Water and Pore Structure of Concrete Affected by Seawater" JCA Proc.of Cement and Concrete. No.52. 684-691 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 七海隆之: "Frost Resistance of Antiwashout Underwater Concrete Containing Blast-Furnace Slag with Different Finenes" The Proc.of 1st Joint Symp Between Korea and Japan. 1. 142-147 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 桜井 宏: "Study on Predicting the Deterioration of Concrete Durability in Various Environments" The Proc.of the 23rd Conf.on Our World in Concrete Structures. 23. 143-150 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 王 欣: "Mechanism of Frost Damage on Concrete Affected by Sea water" The Proc.of the 4th Beijing Int.Symp.on Cement and Concrete. 4. 411-416 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 王 欣: "材令1年まで海水に浸漬したモルタルの細孔構造と凍結水量" 寒地技術論文・報告集. 14. 225-228 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 七海 隆之: "中空微小球と高炉スラグ微粉末の使用による水中不分離性コンクリートの耐凍害性及び強度性状改善" セメント・コンクリート論文集. 52. 362-367 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 王 欣: "海水の作用を受けるコンクリートの凍結水量と細孔構造" セメント・コンクリート論文集. 52. 684-691 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 鮎田耕一: "Improvement of Frost Resistance of Antiwashout Underwater Concrete" Proc.of the 5th.Int.Symp.on Cold Region Development. 5. 93-94 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 七海隆之: "高炉スラグ微粉末・中空微小球を使用した水中不分離性コンクリートの耐凍害性について" 寒地技術論文・報告集. 13. 219-224 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 桐生 宏: "積雪寒冷地における海洋コンクリート構造物の耐凍害性向上について" 寒地技術論文・報告集. 13. 231-236 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 王 欣: "海水の作用を受けるコンクリートの凍結挙動に関する研究" 寒地技術論文・報告集. 13. 237-242 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 桜井 宏: "指数関数モデルを用いたコンクリートの劣化予測" 寒地技術論文・報告集. 13. 243-246 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 七海隆之: "高炉スラグ微粉末を混合した中空微小球添加水中不分離性コンクリートの耐凍害性" セメント・コンクリート論文集. 51. 90-95 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 鮎田耕一: "中空微小球添加水中不分離性AEコンクリートの耐凍害性" セメント・コンクリート論文集. 50. 440-445 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 桜井宏: "寒冷地各種環境下の非線形解析によるコンクリートの劣化予測" 土木学会年次学術講演会講演概要集. 51・5. 392-393 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 斉藤爾: "海水の作用を受けるコンクリート表層部の性氷変化" 土木学会北海道支部論文報告集. 53(A). 472-477 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 七海隆之: "中空微小球と高炉スラグ微粉末を併用したコンクリートの耐凍害性について" 土木学会北海道支部論文報告集. 53(A). 506-511 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 桜井宏: "Analysis and Consideration on resutts of long-term mortar strength test" 北見工業大学研究報告. 28・2. 85-98 (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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