Experimental Study on the Relationship between the Natural Frequency and the Corrosion in Reinforced Concrete Beams

Table 1

Testing stages of the RC test beams.

RC test beam No.	Exposure time (day)
	0 (stage 0)	20 (stage 1)	40 (stage 2)	70 (stage 3)	100 (stage 4)	140 (stage 5)
C30N01	S/D	S/D	—	—	—	—
C30N03	S/D	S/D	S/D	—	—	—
C30N02	S/D	S/D	S/D	S/D	—	—
C30N05	S/D	S/D	S/D	S/D	S/D	—
C30N04	S/D	S/D	S/D	S/D	S/D	S/D

Notes: S denotes static test and D denotes dynamic test.