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

Table 2

Material properties.

Material	Mass density (kg/m^3)	Young’s modulus (GPa)	Poisson’s ratio	Vp (m/s)
Concrete	2440	34.5	0.2	3960
Grout	2500	33.0	0.2	3830