Development of Excitation Device for Non-Destructive Inspection in Concrete Structures Using Gas Combustion

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  • コンクリート構造物の非破壊検査のためのガス燃焼を利用した加振装置の開発
  • コンクリート コウゾウブツ ノ ヒハカイ ケンサ ノ タメ ノ ガス ネンショウ オ リヨウ シタ カシンソウチ ノ カイハツ

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Abstract

This paper is concerned with the development of a shock tube suited for nondestructive inspection in concrete structures. The developed shock tube produces shock waves by combustion of propane-air mixture gas in a long cylindrical tube at short intervals. The propane and air mixture are injected into the reaction chamber from the mixing chamber and ignited. A detonation wave goes through the expansion chamber and extends into the atmosphere. The performance of the tube was evaluated by measuring the pressure distribution on a specimen surface and experiments of defect detection for concrete specimens. A triangular wave with a pressure of 4 kPa and a duration of 0.4 ms was obtained at 500 mm distance from the shock tube. In the defect detection, we could detect a defect with a diameter of 200 mm and a depth of 50 mm clearly.

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