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

Figure 4

Ratios of the lateral dimension and depths of a 35 mm hole. (a) l/d = 0.7. (b) l/d = 0.467. (c) l/d = 0.35. (d) l/d = 0.28. (e) l/d = 0.233.

(a)

(b)

(c)

(d)

(e)