IMPACT ACOUSTICS CHARACTERISTICS OF REINFORCED CONCRETE SLAB WITH INSIDE DAMAGE

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  • 内部損傷を有するコンクリート床版の打音特性に関する基礎実験
  • ナイブ ソンショウ オ ユウスル コンクリート ショウバン ノ ダオン トクセイ ニ カンスル キソ ジッケン

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Applicability of the impact acoustics method for finding inside damages of a reinforced concrete slab of a highway bridge is examined. Six test specimens made of 75 mm thick asphalt concrete and 200 mm thick concrete beneath it are used. They have inside damage either delamination of asphalt concrete, horizontal crack along the reinforcement, or weakening of cover concrete. Impact forces are given at the grid point with 50 mm distance and acoustics are measured beside the impact position. Then, amplitude ratio (ratio of amplitude of acoustic pressure to the impact force), peak Fourier amplitude and corresponding frequency are investigated. These values are found to depend on damaged area. It is found that there are strong correlation between them and size and type of the deteriorated. Finally, a simple chart is proposed to estimate the existence of deteriorated areas and types of deterioration in the concrete slab.

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