Abstract
An investigation was performed by using carbon fiber-reinforced polymer (CFRP) as the anode material in the impressed current cathodic protection (ICCP) system of steel reinforced concrete structures. The service life and performance of CFRP were investigated in simulated ICCP systems with various configurations. Constant current densities were maintained during the tests. No significant degradation in electrical and mechanical properties was found for CFRP subjected to anodic polarization with the selected applied current densities. The service life of the CFRP-based ICCP system was discussed based on the practical reinforced concrete structure layout.
Highlights
Reinforced concrete structures may suffer from premature failure induced by the corrosion of the reinforcing steel embedded in the concrete, which implies that a huge investment in strengthening, repair and rehabilitation is needed in order to reach their targeted service lives [1]
carbon fiber-reinforced polymer (CFRP) was employed to pre-corroded reinforced concrete beams for both structural strengthening and impressed current cathodic protection (ICCP), and the results showed that the ultimate strength of specimens with CFRP for dual functions decreased slightly in comparison to control specimens only for structural strengthening [25,26]
Significant changes of surface conditions were observed in the CFRP strips of Group 2, which were subjected to the anodic polarization in various solutions
Summary
Reinforced concrete structures may suffer from premature failure induced by the corrosion of the reinforcing steel embedded in the concrete, which implies that a huge investment in strengthening, repair and rehabilitation is needed in order to reach their targeted service lives [1]. It is well known that chloride ingress is one of the major causes of steel corrosion, which, in turn, leads to concrete cracking, due to the expansion exerted by corrosion products [2,3]. The corrosion of steel in concrete is generally. Various well-developed methods are available for controlling steel corrosion in concrete [8]. One of the most effective methods, impressed current cathodic protection (ICCP) [9,10], can usually afford sufficient protection and, in some cases, has even been regarded as the only way to control steel corrosion [11]. In an ICCP system, a cathodic current is applied to the reinforcing steel, resulting in the shifting of the steel potential towards a level at which the corrosion rate is negligible [9,10]
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