The Inspection of the Deterioration Factor and Examination of Durable Improvement Measures in the Upper Thickness Increasing Method for Slab Deck Reinforcement

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  • 長谷 俊彦
    中日本高速道路（株） 東京支社 沼津工事事務所
  • 和田 圭仙
    西日本高速道路（株） 九州支社 延岡高速道路事務所 技術課
  • 後藤 昭彦
    （株）高速道路総合技術研究所 道路研究部 橋梁研究室

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Other Title
  • 上面増厚床版における劣化要因の検証と耐久性向上対策の検討
  • ウワツラ ゾウコウ ショウバン ニ オケル レッカ ヨウイン ノ ケンショウ ト タイキュウ セイコウ ジョウ タイサク ノ ケントウ

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Description

In NEXCO, upper thickness increasing method has been commonly adapted for slab deck reinforcement, it is, however, reported that pavement deterioration arisen from de-bonding of the interface between actually RC slab and reinforced concrete cast by this method within several years after the cast, it is, therefore, required to know the causes and its de-bond provisions. The study presents the specific causes obtained by investigation and small specimen tests, and the provision effects followed by the wheel running fatigue test. As the results, pavement deteriorations are strongly affected by the deterioration level of the actual slabs, the de-bonding commonly occurred at the interface between actual slabs and newly cast concrete. It is concluded that adequate provision is required to keep superior bonding strength, and then RC slab reinforcement have to be executed with consideration of deterioration level of the RC slab, are important.

Journal

  • Concrete Journal

    Concrete Journal 50 (3), 245-253, 2012

    Japan Concrete Institute

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