Investigation of flexural behaviour of sea-sand RC members strengthened by ICCP-SS technique
Sea-sand concrete can cause corrosion of steel re-bars in reinforced concrete (RC) structures, resulting in structure deterioration. At present, two methods are used together: using Impressed Current Cathodic Protection (ICCP) to prevent further corrosion of steel re-bars, and bonding carbon fibre meshes to the RC structure to improve the load carrying capacity of the damaged structure.
This study will investigate a new dual-functional method to retrofit sea-sand RC structures by using a carbon - fibre reinforced cementitious matrix (C-FRCM), termed as the Impressed Current Cathodic Protection – Structural Strengthening (ICCP-SS) method. C-FRCM is a dual functional material and can provide the two functions separately provided by ICCP and SS in the conventional method. Therefore, ICCP-SS repairing is a totally new approach for solving the corrosion and safety problems of sea-sand RC members and has the potential to significantly reduce the cost and improve the flexibility of retrofitting.
In this study, tests on sea-sand RC beams repaired by ICCP-SS will be conducted at different periods, followed by numerical studies to investigate the changing effects of ICCP and SS with time. Degradations of CFRP/cementitious materials/concrete interfaces at different stages will be assessed. This research project aims to optimize the ICCP-SS technique and propose a rational design method.
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