RECOVERY EFFECT OF FLEXURAL PERFORMANCE OF REINFORCED CONCRETE BEAMS BY CRACK INJECTION REPAIR USING ULTRA-LOW VISCOSITY EPOXY RESIN AND TENSILE BEHAVIOR OF REBARS EMBEDDED IN REPAIRED CONCRETE

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  • YAMAGUCHI Makoto
    KUMAMOTO UNIVERSITY, Faculty of Advanced Science and Technology（2-39-1, Kurokami, Chuo-ku, Kumamoto-shi, Kumamoto 860-8555, Japan）
  • WANG Yue
    KUMAMOTO UNIVERSITY, Graduate School of Science and Technology（2-39-1, Kurokami, Chuo-ku, Kumamoto-shi, Kumamoto 860-8555, Japan）
  • KOMIYA Ryota
    KUMAMOTO UNIVERSITY, Graduate School of Science and Technology（2-39-1, Kurokami, Chuo-ku, Kumamoto-shi, Kumamoto 860-8555, Japan）
  • DOZONO Aoto
    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を用いたひび割れ注入補修による鉄筋コンクリート梁の曲げ性状回復効果と補修されたコンクリート中における鉄筋の引張挙動

Abstract

<p>In this study, the recovery effect of flexural performance of reinforced concrete（RC）beams by crack injection repair using ultra-low viscosity epoxy resin was verified by flexural loading test of RC beam specimens with a scale of about 1/3 of the actual scale. Furthermore, the tensile behavior of rebars embedded in repaired concrete was investigated by axially-loaded tension tests. As a result of the flexural loading tests, it was confirmed that the flexural performance of the RC beams, of which the tensile rebars had yielded at the time of repair, could be recovered to the same level as undamaged RC beams by this repairing method. From the axially-loaded tension tests, it was observed that a new tensile crack was generated in the concrete at a position different from that generated at the initial loading due to the crack injection repair, and the rebar yield propagated from that crack.</p>

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