Effects of Concrete on Propagation Characteristics of Guided Wave in Steel Bar Embedded in Concrete

Table 2

Attenuation coefficient and the signal amplitude ratio of mode .

Propagating distance (m)	0	1	1.5	2	2.5	3	5
Attenuation (dB)	0	−18	−27	−36	−45	–54	−90
Amplitude ratio	1.000	0.1259	0.0450	0.0159	0.0056	0.0020	0.00003