フライアッシュによるアルカリ骨材反応の膨張抑制効果とそのメカニズム

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  • 長瀧 重義
    社団法人 土木学会 東京工業大学 工学部土木工学科
  • 大賀 宏行
    社団法人 土木学会 東京工業大学 工学部土木工学科
  • 井上 毅
    社団法人 土木学会 東京工業大学 工学部土木工学科

書誌事項

タイトル別名
  • EFFECT OF FLY ASH IN CONTROLLING EXPANSION DUE TO ALKALI-AGGREGATE REACTION AND ITS MECHANISM
  • フライ アッシュ ニ ヨル アルカリ コツザイ ハンノウ ノ ボウチョウ ヨク

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抄録

It is confirmed that excessive expansion of concrete due to alkali-aggregate reaction can be controlled by the use of fly ash as an admixture, but the mechanism of the control is not clarified yet.<br>In this paper, using eight fly ashes with different alkali content, the deformation of Pyrex mortars containing these fly ashes is studied under the accelerated condition and the influences of chemical and physical properties of fly ash on expansion of the mortar are evaluated. Furthermore, the reactivity of Pyrex as an aggregate in mortar bar is also investigated by measuring the dissolved content of boron in mortar and the influence of the reactivity on the expansion is studied.<br>The expansion of mortar depends largely on the type and the replacement ratio of fly ash. Alkali content of fly ash has little correlation with the expansion. The expansion may depend on not only the reactivity of Pyrex but also the stiffness of the mortar. The expansion correlates the reactivity of fly ash in alkali solution. Control of the expansion due to alkali-aggregate reaction can be evaluated by the proposed index using amorphous SiO2 content, mean diameter and the replacement ratio of fly ash.

収録刊行物

  • 土木学会論文集

    土木学会論文集 1990 (414), 175-184, 1990-02-20

    公益社団法人 土木学会

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