The acoustic emission behaviors of repaired reinforced concrete beams under flexure load was studied. Useful correlation was established between the acoustic emission activity and crack growth in the repaired reinforced concrete beams. Three different acoustic emission activities were observed during the flexural loading. Flexural crack initiation, flexural crack propagation and slip between repair material and old concrete were identified by monitoring the acoustic emission. The zone of slip initiation and development can be identified from the acoustic emission event-location plot, showing major acoustic emission concentration areas. Repetitive loading showed that the Kaiser effect was not valid after slip was happened at the connected face between repair material and old concrete. Flexural crack growth acoustic emission burst event signals were found to be of higher amplitude compared with those due to the slip. The accumulated number of burst events of these highamplitude emissions, monitored by the use of a high threshold, showed good correlation with the crack growth in the beam.

抄録全体を表示