Investigation on the Long-term Performance of Impressed Current Cathodic Protection using CFRP anode
Carbon fiber reinforced polymer (CFRP) has been widely used for strengthening deteriorated concrete structures.Moreover, the CFRP could act as a dual-functional material in the proposed ICCP-SS intervention method that is the integration of the impressed current cathodic protection (ICCP) and structural strengthening (SS).The charge densities in the ICCP and the bonding methods of CFRP in the SS, even the shapes of steel reinforcement in the concrete have a further effect on the long-term performance of ICCP system.In this paper, the effect of charge densities on the operating ICCP by using CFRP has been assessed.The externally bonded CFRP against near surface mounted CFRP, and the steel rebars against steel plate in the concrete have been compared for the long-term performance of ICCP.Accelerated ICCP tests have been conducted for more than 300 days.The feeding voltages were recorded for assessing the long-term performance of ICCP with different charge densities.Meanwhile, both the corrosion current densities and 4-hour decay potentials of steels in concrete have been monitored to verify the effectiveness of ICCP using CFRP.In addition, the surface characteristics at the anode interface and CFRP itself were observed.Results shown that it is effective to operate ICCP by using CFRP to limit the corrosion of steel in concrete.The feeding voltages increased as the charge densities increasing.The degradation behaviour could be also observed on the acidification at the anode interface and the loss of tensile strength of CFRP.It can be found that not only the ICCP can survive for more than 300 days at the accelerated operating current density of 100 mA/m2, but the residual tensile strength of CFRP satisfies the requirement for structural strengthening.The externally bonded CFRP is feasible in the ICCP-SS for repairing concrete with corroded steel rebars.
CFRP ICCP structural strengthening charge densities corrosion
Liangliang WEI Wanqian LI Piyu CHEN Ji-Hua ZHU Tamon UEDA Feng XING Dawang LI Meini SU
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Laboratory of Engineering for Maintenance System, Hokkaido University, Sapporo City, Japan School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester City, Un
国际会议
福州
英文
715-723
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）