Effect of ICCP on bond performance and piezoresistive effect of carbon fiber bundles in cementitious matrix

Abstract

The purpose of this study is to lay a foundation for developing a triple-functional system of impressed current cathodic protection, structural strengthening, and structural health monitoring (ICCP-SS-SHM) regarding carbon fabric reinforced cementitious matrix (CFRCM) material performance, and promote the utilization of seawater sea-sand resources to alleviate the shortage of freshwater river sand resources. In recent years, CFRCM, ICCP, and the piezoresistive effect have been widely studied in strengthening reinforced concrete structures, corrosion protection of steel reinforcement, and SHM, respectively. This study used two types of matrix materials: normal matrix (ISO standard sand) and seawater sea-sand matrix. The effect mechanism of the ICCP procedure on the bond performance degradation of CFRCM with the two types of matrix and the bond performance differences between them were investigated through carbon fiber bundle tensile tests and CFRCM bundle pull-out tests. Prediction formulas for bond performance were established based on the different charge densities, mechanical parameters, and resistance parameters, respectively. The piezoresistive effects of CFRCM with the two types of matrix after the ICCP procedure and the effect of ICCP on the piezoresistive effect were analyzed. The seawater sea-sand environment has a positive impact on delaying the degradation of CFRCM by ICCP.