Fig. 10From: Depth estimation of surface-opening crack in concrete beams using impact-echo and non-contact video-based methodsRecorded waveforms showing P-wave arrivals: (a) 12-1# beam; (b) 12-2# beam; (c) 12-3# beam; (d) 16-1# beam; (e) 16-2# beam; (f) 16-3# beamBack to article page