Study on injection of repairing materials to the cracks occurred in the concrete

Abstract

Recently, the deterioration and the degradation advances in the concrete structure. Repairing materials are injected into its crack and pore in order to obtain the strength of the concrete. This paper proposes the repair situation of crack and adhesion using the rectangular diffraction method (Lamp method) of ultrasonic wave testing. It is possible to know the existence of the crack in the concrete by the rectangular diffraction method. In the first wave of ultrasonic waveform, the waveform got from the place without the defect becomes upward. However, the waveform from the defect becomes downward. It is possible to examine the injection situation of repairing materials to artificiality crack and natural crack. In the healthy division where the tiles are perfectly bonded together, the first wave shows the upward waveform, and the downward waveform is shown in the unhealthy division.