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Effect of Mixing Method on the Freeze Thaw Dulability of Silica Fume Concrete

Research Project

Project/Area Number 06650504
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 InstitutionFukuoka University

Principal Investigator

SOEDA Masashi  Faculty of Engineering, Fukuoka University, Research Associate, 工学部・土木工学科, 助手 (50148871)

Co-Investigator(Kenkyū-buntansha) HONDA Satoru  Faculty of Engineering, Fukuoka University, Research Associate, 工学部・建築学科, 助手 (70181550)
EMOTO Yukio  Faculty of Engineering, Fukuoka University, Associate Professor, 工学部・土木工学科, 助教授 (50090882)
SHIIBA Hiroyuki  Faculty of Engineering, Fukuoka University, Professor, 工学部・建築学科, 教授 (30103782)
YAMATO Takeshi  Faculty of Engineering, Fukuoka University, Professor, 工学部・土木工学部, 教授 (90078650)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
KeywordsSilica Fume / Mixing Time / Air Content / Surerplasticizer / Pore Structure / Air Void System / Compressive Strength / Water-to-cement ratio / 養生方法 / 積算温度 / 品質 / 比重・湿分 / 活性度指数 / モルタル / コンクリート
Research Abstract

Using various types of silica fume colleted so far, the authors investigated the effects of the form and chemical components of silica fume on the fluidity of concrete with relation to material charging methods and mixing time. Freezing and thawing tests and air-void distribution measurements were also made on hardened concrete, for the purpose of total evaluation of the resistance to freezing from the aspects of the mixing method and air-void distribution.
The results obtained in this paper are summarized as follows :
1. The freezing resistance of non-AE concrete with a water-binder ratio of 35% or higher significantly decreases as the silica fume replacement ratio increases. The limit water-binder ratio to produce non-AE concrete judged as having high resistance to freezing is around 25%. Concrete with a higher water-binder ratio will require appropriate air entraining.
2. The air content required to obtain sufficient resistance to freezing for silica fume concrete with a water-binder r … More atio of 55% is around 6% and 8% at a replacement ratio of 10% and 20%, respectively. The air content should therefore be increased by 2 to 4 percentage points when using silica fume.
3. The void spacing factor increases as the water-binder ratio decreases. With the water-binder ratio at 35% or higher, the void spacing factor of concrete containing silica fume tends to be slightly higher than the case without silica fume.
4. Silica fume concrete with an entrained air content of around 4% and a low water-binder ratio has high resistance to freezing independently of the mixing time. When the water-binder ratio is 55%, a difference in the mixing time leads to a wide difference in the durability factor, with the maximum being two times the minimum.
5. The microstructure of hardened concrete is densified by the use of silica fume or a reduction in the water-binder ratio, but is scarcely affected by the mixing time.
6. The use of silica fume reduces air-voids smaller than 200 ()m in diameter and increases air-voids larger than 500 ()m in diameter.
7. The pore size distribution varies depending on the mixing time. The total number of air-voids in silica fume concrete is largest when it is mixed for 180 seconds. Also, the number of small-diameter voids increases and the void spacing factor decreases at this mixing time. Less

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] 添田政司: "練混ぜ時間がシリカフュームコンクリートの耐凍害性に及ぼす影響" コンクリート工学年次論文報告集. Vol.16. 401-406 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 添田政司: "シリカフュームコンクリートの養生方法が強度および耐久性に及ぼす影響" コンクリート工学年次論文報告集. Vol.17. 369-374 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 添田政司: "各種粉体を用いた早強型高流動コンクリートの強度特性について" セメント・コンクリート研究討論会論文報告集. Vol.23. 110-115 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masashi Soeda: "Freezing and Thawing and Durability of High Flowing Concrete Using Cementitious Materials" Fourth CANMET/ACI Inte. Conference on Durability of Concrete. Vol.1. (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 添田政司: "シリカフュームを混和したコンクリートの耐久性に関する基礎的研究(第2章コンクリートのフレッシュ性状に及ぼすシリカフュームの影響に関する研究)" 福岡大学学位請求論文. 19-38 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 添田政司: "シリカフュームを混和したコンクリートの耐久性に関する基礎的研究(第4章シリカフュームコンクリートの耐凍害性に関する研究)" 福岡大学学位請求論文. 99-129 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 椎葉大和: "高性能AE減水剤のシリカフュームへの吸着性状に関する研究(その1.吸着速度および飽和吸着量)" 日本建築学会大会学術講演梗概集(東海). 73-74 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 椎葉大和: "高性能AE減水剤のシリカフュームへの吸着性状に関する研究(その2.吸着量の相違がモルタルの流動性に及ぼす影響)" 日本建築学会大会学術講演梗概集(東海). 75-76 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 橋本親典: "シリカフュームの品質規格(案)作成のための共通試験結果について" 「シリカフュームを用いたコンクリート」に関するシンポジウム講演論文報告集,土木学会. 37-44 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masashi Soeda: "Influence of Mixing Time on the Freeze-Thaw Durability of the Condensed Silica Fume" Proceedings of the Japan Concrete Institute. Vol. 16, No. 1. 401-406 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masashi Soeda: "Effect of Curing Methods on the Strength and Durability of the Condensed Silica Fume" Proceedings of the Japan Concrete Institute. Vol. 17, No. 1. 369-374 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masashi Soeda: "Strength Development of Early Strength and High Flowability Concrete Using Different Cementitious Materials" Proceedings of the 23rd JUCC Congress on Cement and Concrete. 110-115 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masashi Soeda: "Freezing and Thawing Durability of High Flowing Concrete Using Different Cementitious Materials (in the press)" Fourth CANMET/ACI International Conference on Durability of Concrete Sydney, Australia. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masashi Soeda: "Fundamental Study on Durability of Concrete Using of the Condensed Silica Fume (Chapter 2, Study on Fresh Concrete Using of the Condensed Silica Fume)" Fukuoka University of application for Doctor Paper. 19-38 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Masashi Soeda: "Fundamental Study on Durability of Concrete Using of the Condensed Silica Fume (Chapter 4, Study on Freeze-Thaw Durability Using of the Condensed Silica Fume)" Fukuoka University of application for Doctor Paper. 99-129 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hiroyuki Shiiba: "Study on Adsorption of Superplasticizer on Silica Fume (Part 1. Adsorption speed and Saturated Adsorption Volume)" Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan. 73-74 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hiroyuki Shiiba: "Study on Adsorption of Superplasticizer on Silica Fume (Part 2. Effect on Flow of Mortar for Different Adsorption value)" Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan. 75-76 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Chikanori Hashimoto: "Experimental Studies on Test Methods for Standard Quality of Silica Fume for Concrete" Symposium on used of Silica Fume Concrete. 37-44 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 添田政司: "各種粉体を用いた早強型高流動コンクリートの強度特性について" セメント・コンクリート研究討論会論文報告書. Vol.23. 110-115 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Masashi Soeda: "Freezing and Thawing and Durability of High Flowing Concrete Using Cementitious Materials" Fourth CANMET/ACI Int.Conference on Durability of Concrete. Vol.1. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 添田政司: "シリカフュームコンクリートの養生方法が強度および耐久性及ぼす影響" コンクリート工学年次論文報告集. Vol. 17. 369-374 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 添田政司: "練り混ぜ時間がシリカフュームコンクリートの耐凍害性に及ぼす影響" コンクリート工学年次論文報告集. Vol.16. 401-406 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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