Grouting Defect Detection of Lapped Bar Connections Based on Impact-Echo Method

Figure 12

Corresponding frequencies of different depths of hole. (a) 50 mm. (b) 75 mm. (c) 100 mm. (d) 125 mm. (e) 150 mm. (f) Wave path.

(a)

(b)

(c)

(d)

(e)

(f)