Combined Impressed Current Cathodic Protection and FRCM Strengthening for Corrosion-Prone Concrete Structures

Abstract

：This study introduces the use of the combined impressed current cathodic protectionstructural strengthening (ICCP-SS) as a technique for repairing reinforced concrete (RC) structures that have been subjected to chloride-induced corrosion. The development of this technique is based on the combination of a carbon fiber mesh (CF-MESH) and a polymer-modified cementitious matrix to produce a carbon fiber reinforced cementitious matrix (C-FRCM). Firstly, the effects of different types and amounts of high molecular weight polymer and short chopped carbon fibers on the flexural and compressive strength, conductivity and shear strength of a matrix with concrete substrate were investigated in order to find the optimum ingredients required for a high-performance cementitious matrix. Secondly, a shaped CF-MESH was bonded onto the surface of a concrete cube using the aforementioned optimized cementitious matrix. The impressed current cathodic protection (ICCP) technique was then applied to the specimens by using different current densities with the CF-MESH as the anode. During the Mei-ni SU 1 , Liangliang WEI 2 , Ji-Hua ZHU 3* , Tamon UEDA 4 , Guan-ping GUO 5 , Feng XING, "Combined Impressed Current Cathodic Protection and FRCM Strengthening for Corrosion-Prone Concrete Structures", Journal of composites for construction, ASCE, 23(4):04019021. protection period, the protection conditions of rebars subjected to ICCP were assessed by analyzing a variety of electrochemical parameters. Thirdly, single shear tests were conducted; the shear strengths and failure modes of the specimens were obtained and compared in order to evaluate the effects of the ICCP on shear stress transfer. The results show that the proposed technique based on the newly proposed C-FRCM composite is able to provide effective cathodic protection as well as shear stress transfer behavior to RC structures subjected to chloride-induced corrosion, leading to an improvement with respect to structural durability.

Anodic and Mechanical Behavior of Carbon Fiber Reinforced Polymer as a Dual-Functional Material in Chloride-Contaminated Concrete

“…The CFRP was used as the auxiliary electrode for measuring the current flow (∆I), which was induced by an externally imposed potential shift (∆E) of 20 mV. Thus, the polarization resistance R p and corrosion current (I corr ) can be calculated with Equations (1) and (2). The value of B is normally assumed to be 25 mV for actively corroded steel in concrete [18].…”

“…In recent years, a new intervention system, integrating impressed current cathodic protection (ICCP) with structural strengthening (SS), has been proposed to be ICCP-SS for improving the maintenance of concrete suffered from the corrosion of steels induced by chloride [1][2][3][4]. Structural strengthening by FRP or steel plates has been proven to be an effective method of improving the structural performance of corroded concrete structures, although the performance might degrade later due to the continuous corrosion of the steel in the concrete [5].…”

Synthesized intervention method to prolong service life of reinforced concrete structures: ICCP‐SS

“…Tests on columns with corroded reinforcing steel, protected by the ICCP-SS system, showed that the system worked successfully with regard to both its protecting and its strengthening function (Su et al, 2 and Zhu et al, 3,4 ) The performance of the CFRP anode was investigated in a simulated ICCP system with an electrode composed of 3% NaCl solution, NaOH solution, and simulated pore solution. On the one hand, the CFRP could operate in a stable way in all three solutions, and the electrochemical performance was not significantly compromised during 50 days of polarization when the applied current was as high as 6.15 A/m 2 .…”

Thermal and Seismic Capacity Improvements for Masonry Building Heritage: A Unified Retrofitting System

“…For this reason, more recently, a new type of composites was considered for the structural retrofitting: Fabric Reinforced Cementitious Mortar (FRCM) [9][10][11][12][13][14][15][16][17][18][19][20][21]. The main idea consists of substituting the resin with an inorganic-like matrix.…”