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

Table 3

Attenuation coefficient and the signal amplitude ratio of mode .

Propagating distance (m)	0	1	1.5	2	2.5	3	5
Attenuation (dB)	0	−36.8	−55.2	−73.6	−92	−110.4	−184
Amplitude ratio	1.000	0.0150	0.0017	0.0002	0.00002	3.0 × 10^−6	6.2 × 10^−10