TY - JOUR
T1 - Impressed current cathodic protection of chloride-contaminated RC structures with cracking
T2 - A numerical study
AU - Guo, Bingbing
AU - Qiao, Guofu
AU - Li, Zhenming
AU - Li, Dongsheng
AU - Dai, Jinghui
AU - Wang, Yan
PY - 2021
Y1 - 2021
N2 - Impressed current cathodic protection (ICCP) is an effective and direct method for controlling the corrosion of reinforced concrete (RC) structures. However, few investigations related to ICCP in cracked RC structures have been reported. In this study, the effect of cracks in concrete cover on ICCP of chloride-contaminated RC structures was investigated through a numerical model including steel polarisation, electrode reactions, and ionic migration. In the developed numerical model, cracked concrete cover is assumed to consist of sound concrete and cracks, and cracks have their own ionic diffusion coefficients. The results indicate that the ICCP can maintain its ability to remove Cl− if concrete cover does not completely crack. Once the complete cracking in concrete cover occurs, the Cl− removal ability of ICCP would decrease or even disappear. Cracking does not cause any adverse effect on the pH improvement of ICCP. In this case, a stronger cathodic polarisation is recommended.
AB - Impressed current cathodic protection (ICCP) is an effective and direct method for controlling the corrosion of reinforced concrete (RC) structures. However, few investigations related to ICCP in cracked RC structures have been reported. In this study, the effect of cracks in concrete cover on ICCP of chloride-contaminated RC structures was investigated through a numerical model including steel polarisation, electrode reactions, and ionic migration. In the developed numerical model, cracked concrete cover is assumed to consist of sound concrete and cracks, and cracks have their own ionic diffusion coefficients. The results indicate that the ICCP can maintain its ability to remove Cl− if concrete cover does not completely crack. Once the complete cracking in concrete cover occurs, the Cl− removal ability of ICCP would decrease or even disappear. Cracking does not cause any adverse effect on the pH improvement of ICCP. In this case, a stronger cathodic polarisation is recommended.
KW - Cracks
KW - Impressed current cathodic protection
KW - Numerical modelling
KW - Reinforced concrete structures
KW - Steel corrosion
UR - http://www.scopus.com/inward/record.url?scp=85109190584&partnerID=8YFLogxK
U2 - 10.1016/j.jobe.2021.102943
DO - 10.1016/j.jobe.2021.102943
M3 - Article
AN - SCOPUS:85109190584
VL - 44
JO - Journal of Building Engineering
JF - Journal of Building Engineering
SN - 2352-7102
M1 - 102943
ER -