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Prevention against Alkali Aggregate Reaction by Using Pozzolan

Research Project

Project/Area Number 60460153
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field コンクリート工学・土木材料・施工
Research InstitutionKyoto University

Principal Investigator

KOBAYASHI Kazuo (1986)  Associate Professor, Faculty of Engineering, Kyoto University, 工学部, 助教授 (10021586)

岡田 清 (1985)  京都大学, 工学部, 教授

Co-Investigator(Kenkyū-buntansha) INOUE Susumu  Instructor, Faculty of Engineering, Kyoto University, 工学部, 助手 (30168447)
MIYAGAWA Toyoaki  Instructor, Faculty of Engineering, Kyoto University, 工学部, 助手 (80093318)
KOJIMA Takayuki  Professor, Faculty of Science and Engineering, Ritsumeikan University, 工学部, 教授 (10066706)
OKADA Kiyoshi  Professor, Faculty of Engineering, Fukuyama University, 工学部, 教授 (00025777)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1986: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1985: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsAlkali Aggregate Reaction / Pozzolan / 高炉スラグ / フライアッシュ / シリカフューム
Research Abstract

Repairing and reinforcing the existing concrete structures damaged by alkali aggregate reaction, in particular, alkali silica reaction (ASR) is usually very difficult, and therefore it is now required to establish the effective methods for preventing the ASR by means of utilization of appropriate materials. Some results of previous tests showed that the addition of pozzolans, such as blast-furnace slag, fly ash and silica fume, reduced or prevented the ASR expansion of concrete, and then prevention method of ASR like this had been recommended in some foreign countries. However, the prevention mechanism of ASR due to addition of pozzolans is not yet made clear, and their use has an adverse effects on ASR expantion in some cases, depending upon an amount of added pozzolan.
In this study, utilization of three kinds of pozzolans for preventing the ASR expansion was tested by using the mortar and concrete prism specimens. The results of tests showed that <i> ) the ASR expansion of mortar could not fully be prevented even when 60% of ordinary portland cement was replaced by blast-furnace slag (called as, for example, "60% addition of slag" here-after), although reduced with increasing slag content, <ii> ) the ASR expansion of mortar could be prevented by 25-30% addition of fly ash, but it should be noted that a little amount, for instance, 5% addition of fly ash rather increased the expansion, <iii> ) the silica fume retarted the age at which ASR expansion commenced to occur, and 25-30% addition of silica fume was very effective for preventing the expansion although considerably expanded on the contrary when its added amount is small, and <iv> ) both of the blast-furnace slag cement of B type (slag content: 45%) and the fly-ash cement of B type (fly ash content: 18%) could effectively reduce the ASR expansion of concrete.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 岡田清 他: コンクリート工学年次講演会論文集. 7. 157-160 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 岡田清 他: コンクリート工学年次講演会論文集. 7. 161-164 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 岡田清: 土木学会誌. 70-11. 2-6 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 小林和夫: コンクリート工学. 24-11. 70-78 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M.Fujii et al.: Rroc.of 7th International Conference on Alkali-Aggregate Reaction,Ottawa.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H.Imai et al.: Proc. of 7th International Conference on Alkali-Aggregate Reaction,Ottawa.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 岡田清 他: "アルカリ骨材反応に関するシンポジウム" 日本材料学会, 172 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 岡田清 他: "最新コンクリート工学" 国民科学社, 307 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kiyoshi Okada et al.: "Experimental Study on Corelation between ASTM Chemical Method and the Mortar Bar Method in Alkali Aggregate Reaction" Proc. of JCI. 7. 157-160 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kiyoshi Okada et al.: "Properties of Expansion of Concrete Specimen with Reactive Aggregate and the Corresponding Mortar Bar" Proc. of JCI. 7. 161-164 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kiyoshi Okada: "Topics about Construction Materials - Stressing Durability of Concrete" Jour. of JSCE. 70-11. 2-6 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kazuo Kobayashi: "Load Carrying Behaviors of Concrete Structures and Members Affected by Alkali-Aggregate Reactions - Reinforced Concrete Beams" Concrete Journal. 24-11. 70-78 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] M. Fujii et al.: "The Static and Dynamic Behaviors of Reinforced Concrete Beams with Cracking due to Alkali-Silica Reaction" Proc. of 7th International Conference on Alkali Aggregate Reaction, Ottawa.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Kiyoshi Okada et al.: JSMS. Sympoium on Alkali Aggregate Reaction, 172 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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