Study on Corrosion Resistance of Reinforcement in Recycled Aggregate Concrete with Chloride Salt in Original Concrete

Abandoned concrete in coastal areas were corroded by chloride ions. In order to better recycle the concrete corroded by chloride ions, and explore the corrosion properties of reinforcement in recycled aggregate concrete with chloride salt in original concrete. Here 15 groups of concrete were designed with the types and contents of mineral admixtures and aggregate strengthening as variables. After accelerated corrosion by electrification, the steel reinforcement electrochemical indexes were measured by linear polarization method and electrochemical impedance spectroscopy method of electrochemical work. The results show that the corrosion process of steel reinforcement in chlorine-containing recycled aggregate concrete is faster than that in ordinary recycled concrete. Both nano-SiO2 solution strengthening recycled aggregate and adding mineral admixtures can commonly improve the corrosion resistance of recycled concrete with chloride salt in original concrete. And by strengthening and modifying, the corrosion resistance of chloride containing recycled aggregate concrete can not lower than that of ordinary recycled aggregate concrete without chlorine. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.