FUNDAMENTAL STUDY ON BUBBLE SIZE DISTRIBUTION OF ENTRAINED AIR IN CONCRETE THROUGH VIBRATION COMPACTION

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  • OYAMADA Tetsuya
    IWATE UNIVERSITY, Faculty of Science and Engineering（4-3-5, Ueda, Morioka-shi, Iwate 020-8551, Japan）
  • ITO Izumi
    IWATE UNIVERSITY, Graduate School of Arts and Sciences（4-3-5, Ueda, Morioka-shi, Iwate 020-8551, Japan）
  • ICHINOHE Haruki
    OBAYASHI Corporation, Tohoku Branch（2-5-1, Honcho, Aoba-ku, Sendai-shi, Miyagi 980-0014, Japan）
  • NAKAMURA Daiki
    IWATE UNIVERSITY, Engineering Department（4-3-5, Ueda, Morioka-shi, Iwate 020-8551, Japan）

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Other Title
  • 振動締固め方法によるコンクリート中の連行空気の移動に関する基礎的検討

Abstract

<p>A fundamental study was conducted on the bubble size distribution of entrained air in concrete using vibration compaction. Two vibration methods, internal vibration and external vibration, were employed, and a 200mm cubic formwork was used. In the case of internal vibration, it was observed that water collected around the rod vibrator, and the air moved in the opposite direction of the vibrator horizontally. Vertically, the air moved upward due to buoyancy. Air bubbles adhering to the formwork slowly moved along the surface of the formwork. On the other hand, with external vibration, the formwork vibrated, resulting in the inward movement of entrained air, contrary to internal vibration. By combining these methods, it is believed that efficient vibration compaction can be achieved while retaining entrained air.</p>

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