This study investigates the feasibility of combining the impressed current cathodic protection (ICCP) as well as structural strengthening (SS) techniques for retrofitting reinforced concrete (RC) structures subjected to chloride-induced corrosion. In this ICCP-SS system, a dual-functional material, the carbon - fiber reinforced cementitious matrix (C-FRCM) composite, is used as both the anode and the strengthening material. The C-FRCM composite is consisted of a carbon fiber net (CF-NET) and a polymer-modified cementitious matrix. In order to evaluate the shear stress transfer behavior after ICCP, a series of specimens contained chloride ions were prepared for the single shear tests. Afterwards, impressed current cathodic protection (ICCP) was applied to the corroded specimens using different current densities for 60 days. Single shear tests were conducted after ICCP. The bond strengths and failure modes of the specimens subjected to cathodic protection were obtained. By comparing results, the effects of ICCP, especially some key parameters such as the current density and the electric quantity, on the shear stress transfer behavior was assessed. It is found that for the RC structures subjected to chloride-induced corrosion, the C-FRCM composite is not only an appropriate anode for ICCP, but also an effective strengthening material for shear stress transfer. Therefore, the innovative ICCP-SS retrofitting technique is seen to be promising and will lead to an improvement with respect to structural durability.
|Title of host publication||APFIS2017 - 6th Asia-Pacific Conference on FRP in Structures|
|Publication status||Accepted/In press - 19 Jul 2017|