INFLUENCE OF UPWARD REPAIR EXECUTION ON FLEXURAL PERFORMANCE AND SALT PERMEATION RESISTANCE OF REINFORCED CONCRETE BEAMS REPAIRED BY INJECTING CRACKS USING ULTRA-LOW VISCOSITY EPOXY RESIN

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  • SHIBATA Daigo
    KUMAMOTO UNIVERSITY, Graduate School of Science and Technology（2-39-1, Kurokami, Chuo-ku, Kumamoto-shi, Kumamoto 860-8555, Japan）
  • YAMAGUCHI Makoto
    KUMAMOTO UNIVERSITY, Faculty of Advanced Science and Technology（2-39-1, Kurokami, Chuo-ku, Kumamoto-shi, Kumamoto 860-8555, Japan）
  • MATSUKI Yo
    KUMAMOTO UNIVERSITY, Graduate School of Science and Technology（2-39-1, Kurokami, Chuo-ku, Kumamoto-shi, Kumamoto 860-8555, Japan）

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Other Title
  • 超低粘度エポキシ樹脂によりひび割れ注入補修された鉄筋コンクリート梁の曲げ性状および塩分浸透抵抗性に及ぼす上向き補修施工の影響

Abstract

<p>The objective of this study was to obtain knowledge that contributes to the development of a performance recovery technology for severely damaged reinforced concrete（RC）members. The RC beams in which the tension rebars had yielded were repaired by injecting cracks using ultra-low viscosity epoxy resin, and the influence of the upward repair execution on their flexural performance and salt permeation resistance was experimentally investigated. The results showed that the flexural strength and toughness of the damaged RC beams can be recovered to the same level or higher than that of the undamaged RC beams by adapting this repair method, regardless of the direction of the repair execution. Further, it was also clarified that the salt permeation through cracks can be prevented well regardless of the direction of the repair execution.</p>

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