Abstract
The dual function of a carbon fiber-reinforced polymer (CFRP) bar working as reinforcement and impressed current cathodic protection (ICCP) anode for reinforced concrete structures has been proposed and researched in this paper. The ICCP tests with different current densities and polarization durations were first conducted for the concrete with high chloride content. After the ICCP application, pull out tests were then performed to investigate the bond behaviors of CFRP bars. Experimental results have shown the effectiveness of the new-type ICCP system with the CFRP bar as the anode on corrosion protection. The ICCP system provided electrons to the steel bar continuously and brought the potential of the steel bar down to the immunity region. Under the anodic polarization with a large current density of 100 mA/m2, the CFRP bar-concrete interface presented acidification and the chemical adhesion on the interface was decreased significantly. However, for cases in the experiment, the ICCP application had an insignificant influence on the ultimate bond strength.
Highlights
Components significantly [12, 13]. e performances of concrete structures can be improved significantly by utilizing a combination of fiber-reinforced polymer (FRP) and steel reinforcements [14,15,16,17,18]
Lee-Orantes et al [23] conducted an experimental investigation on a reinforced concrete cathodic protection system with carbon fiber-reinforced polymer (CFRP) anodes, and no apparent degradation of carbon composites and conductive resins was observed. e impressed current cathodic protection (ICCP) tests of RC beams conducted by Gadve et al [24] demonstrated that using FRP wraparounds as an anode effectively retarded the corrosion of steel, and the loss of bond between steel and concrete can be avoided by selecting the appropriate protection current density
The ICCP technique was applied to the hybrid CFRP-steel reinforced concrete structures with the CFRP bar as the anode material and reinforcement
Summary
E CFRP bar was extended from the specimen left surface for 300 mm to facilitate applying load and installing extensometers in the pull out test. A 50 mm CFRP bar was extended beyond the right surface of the cylinder for the connection of anode in the ICCP test and the installation of extensometers in the pull out test. According to NACE SP0290-2007 [28], current densities of 5, 20, 50, and 100 mA/m2 were applied on specimens in 4 groups, respectively, while the other group was set as a reference group and did not undergo the ICCP test. Before ICCP application, both the steel bar and the CFRP bar extended outside the concrete cubic were polished to ensure a good conductivity at the cathode and anode connection. After ICCP operation, pull out tests were conducted on specimens to investigate the bond performance of CFRP bars after galvanostatic anodic polarization. After the pull out test, phenolphthalein solution was sprayed on the bonded area of the split concrete matrix to investigate the acidification condition of the CFRP bar-concrete interface
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