Seismic Behavior of Corroded RC Bridges: Review and Research Gaps

Table 9

Effect of corrosion on bond strength between concrete and steel reinforcement.

Authors and date	Sample (); test	Corrosion method	Time exposure		Bond strength; % of change
[82]	14 mm bending	2000	NS	0.55	; 40
	10 mm pullout			0.55	; 42
	10 mm pullout			3.5–7.4	; 0–66
	14 mm pullout			0.65	; 28
	14 mm pullout			2.6–5.7	; 0–65
	20 mm pullout			0.43	; 25
	20 mm pullout			1.6–4	; 0–47
[107]	12 mm, pullout	0.4 A current electric	NS	4	; 17
				5–7	; 30–69
				8–12	; 70–78
				12–80	; 78–86
[84]	12 mm, pullout	2–64 A current electric	<28 days	0.7	; 18
				2.42, 12	; 5, 60
[108]	19 mm, pullout	Saturated in Ca(OH)2	<5 weeks	NS	; NS
			>5 weeks	NS	; NS
[5]	10 mm, bending	0.1 A current electric	21–63 days	20	; 74
[6]	19 mm, pullout	12 A current electric	>3 days	0–5.2	; 78
[7]	13 mm, pullout	1 A current electric	NS	3	; 35
			NS	16.8	; 77
			NS	13	; 13
			NS	24	; 38
[109]	10 mm, pullout, 15 mm cover specimen	140	NS	5	; 15
					; 35
[110]	10 mm, bending	12 A current electric	NS	2	; 30
				2.8, 15	; 0, 77
[111]	Deformed pullout	0–2 A current electric	10–12 days	4, 9	; 45, 68
	Deformed pullout			3.8, 6	; 4, 12
	Smooth, pullout			3.3	; 21
[8]	20 mm, pullout	0–2 A current electric	NS	4	; 45
				3.8	; 5
[112]	20 mm, pullout	500	8–48 h	0.2, 0.36	; 50, 20
			56–96 h	0.4, 0.76	; 20, 84
Berto et al. [9]	10 mm, pullout	NS	NS	4.27	; 12
				7.8	; 75
Chung et al. [113]	13 mm, pullout	12 A current electric	>3 days	3	; 40
				3–7	; 27
Kivell [10]	Deformed, 20 mm pullout	0.1 A current electric	10–50 days	0.6, 11	; 6, 50
				20	; 76
	Def. 20 mm cyclic			18.6	; 59

indicates decreasing and increasing bond strength of corroded bar in comparison with sound bar; indicates confined reinforced concrete. It should be noted that increasing cycles also cause a reduction in bond strength.