モルタルの流動性におよぼす骨材中のモンモリロナイトの影響 Influence of Montmorillonite in Aggregate on Fluidity of Mortar

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It is well known that the aggregate containing montmorillonite suppresses the flowability and accelerates the setting of concrete. In this study, the influence of such aggregate on the early hydration of cement was investigated and the mechanism of flow loss of fresh mortar was discussed.<BR>The fine aggregate containing montmorillonite used in this study shows a remarkable adsorption of OH<SUP>-</SUP> and K<SUP>+</SUP> ions. Immediately after the mixing, the saturation degree of Ca (OH) <SUB>2</SUB> in liquid phase of mortar was extremely depressed by using this aggregate. Consequently, the initial hydration of interstitial phase was accelerated and the monosulphate hydrate formed with ettringite. After that, the saturation degree of Ca (OH) <SUB>2</SUB> increased rapidly and the monosulphate hydrate was converted to the ettringite. It is considered that the remarkable flow loss of the mortar using this aggregate after one hour is due to the rapid conversion of monosulphate hydrate to the ettringite with large cohesive energy.

収録刊行物

  • 無機マテリアル : セッコウ・石灰・セメント・地球環境の科学 = Inorganic materials  

    無機マテリアル : セッコウ・石灰・セメント・地球環境の科学 = Inorganic materials 4(267), 93-100, 1997-03 

    The Society of Inorganic Materials, Japan

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各種コード

  • NII論文ID(NAID)
    10002122481
  • NII書誌ID(NCID)
    AN10455831
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13407899
  • NDL 記事登録ID
    4161209
  • NDL 雑誌分類
    ZP9(科学技術--化学・化学工業--無機化学・無機化学工業--セラミックス・窯業)
  • NDL 請求記号
    Z17-B79
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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