Improvement of Frost Resistance of Concrete by Pulp Addition

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  • パルプ配合によるコンクリートの耐凍害性の改善
  • パルプ ハイゴウ ニ ヨル コンクリート ノ タイトウガイセイ ノ カイゼン

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Abstract

Recently, the amount of generated coal ash has been also increased. Therefore, effective utilization technology of coal ash should be developed urgently. The coal fly ash is a fine particle fraction of coal ash, has been already utilized for the improvement of durability and fluidity of the cement concrete. However, it is known that there is a problem in durability and strength of concrete containing with high percentage of fly ash. Therefore, fly ash content of the cement concrete is usually 15％ or around, and to be 30％ at most.<BR>In this paper, we attempted to the prevention of decreasing of strength and durability in high fly ash―containing concrete（substitution ratio：60％）, by pulp addition. The mechanical strength change due to material age was measured, and freeze―thawing test was also carried out as an indicator of durability. As a result, by pulp addition to the concrete with high substitution of fly ash, the mechanical strength was reached to sufficient value for withstanding practical use, and also the frost resistance was dramatically increased. Although the mechanism is unknown, it was presumed that addition of pulp fiber has inhibited of separation of fly ash and cement particles due to the density difference. In addition, it was expected that the reduction of damage from freeze―thawing cycle by the hollowed structure of pulp fiber has resulted expression of high frost resistance.

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 68 (4), 380-384, 2014

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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