A Study on Detection of Internal Deterioration of Concrete Slabs Using Impact Elastic Wave Method

IR

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Other Title
  • 衝撃弾性波法によるコンクリート床版の内部劣化検出に関する研究

Abstract

In this study, internal defects simulating horizontal crack and gravel layer in slab were create on the upper surfaces of a test specimen with the same bar arrangement and slab thickness as the reinforced concrete slab of an expressway bridge. It was verified by the impact elastic wave method from the bottom side of the test specimen. Resulting in, the detection rate of abnormal values near the center of the internal defect of slab specimen was high, but the detection rate was low near the edge of the internal defect. In addition, for horizontal cracks, abnormal values were smaller than the member thickness, but for gravel layer in slab, some abnormal values were smaller than the member thickness, while others are larger than the member thickness.

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