Bond Deterioration of Corroded-Damaged Reinforced Concrete Structures Exposed to Severe Aggressive Marine Environment

Table 4

Properties of corroded specimen.

Group, (mm)	Specimen; ID No.		Crack width; (mm)	Weight of rebars before corrosion; (g).	Weight of rebars after corrosion (g)	Corrosion level; (%)	Area reduction (mm^2)	Corrosion rate, CR; (μAmpere/cm^2)	Bond stress; (MPa)	Actual mass of rust (g/cm^2)	Loss in strength; (%)
Unconfined	I (16)	A-0	—	789.168	—	—	—	—	6.00	—	—
		A-1	0.230	789.168	740	20.88	12.61	1.077	2.65	0.202	55.833
		A-2	0.223	789.168	741	20.42	12.27	1.055	2.60	0.197	56.667
		A-3	0.210	789.168	742	19.98	12.13	1.032	2.70	0.193	55.000
	II (20)	B-0	—	1233.075	—	—	—	—	13.00	—	—
		B-1	0.117	1233.075	1219	3.63	3.76	0.240	9.50	0.045	26.923
		B-2	0.130	1233.075	1219	3.63	3.76	0.240	9.30	0.045	28.462
		B-3	0.150	1233.075	1218	3.89	4.07	0.258	9.11	0.048	29.923
	III (25)	C-0	—	1926.68	—	—	—	—	17.00	—	—
		C-1	0.090	1926.68	1918	1.42	2.35	0.118	14.20	0.022	16.471
		C-2	0.075	1926.68	1919	1.26	1.96	0.104	14.30	0.019	15.882
		C-3	0.030	1926.68	1916	1.75	2.75	0.145	14.35	0.027	15.588
Confined	IV (16)	D-0	—	789.168	—	—	—	—	21.00	—	—
		D-1	0.019	789.168	787	0.87	0..75	0.046	19.00	0.008	9.524
		D-2	0.015	789.168	786	1.27	0.75	0.067	19.20	0.012	8.571
		D-3	0.010	789.168	788	0.47	0.50	0.025	19.30	0.004	8.095
	V (20)	E-0	—	1233.075	—	—	—	—	24.00	—	—
		E-1	0.008	1233.075	1233	0.12	0.31	0.008	23.50	0.0015	2.083
		E-2	0.007	1233.075	1233	0.15	0.31	0.009	23.60	0.0018	1.667
		E-3	0.006	1233.075	1232	0.17	0.31	0.011	23.40	0.0021	2.500
	VI (25)	F-0	—	1926.68	—	—	—	—	30.00	—	—
		F-1	0.006	1926.68	1927	0.005	0.39	0.0004	29.87	0.0000764	0.433
		F-2	0.004	1926.68	1927	0.003	0.39	0.0002	29.75	0.0000509	0.833
		F-3	0.003	1926.68	1927	0.002	0.39	0.0001	29.85	0.00002547	0.500

*Note: Concrete cover thickness of 50 mm.