Issue 50

V. Saltas et alii, Frattura ed Integrità Strutturale, 50 (2019) 505-516; DOI: 10.3221/IGF-ESIS.50.42 508 Figure 3 : Time history of the distribution of amplitudes and the occurrence rate of the recorded AE hits in all channels, during the 24- h monitoring of the fracturing process of the concrete specimen under the effect of the cracking agent. Figure 4 : 3D plot of the time evolution of the duration (in μs) of the hits in each recording channel, during the 24-h monitoring period of the concrete block subjected to the cracking agent charging.