AI Article Synopsis
- - The study investigates how electrochemical treatment affects OH ion leaching from cement paste when steel and an external mesh are used, employing microscopic analysis and leaching rate measurements over time.
- - The treatment involved a current density of 1000 mA/m maintained for 4 weeks, leading to a significant pH drop in the external water from 13.46 (untreated) to 9.32 (treated), indicating reduced OH ion leaching.
- - Additionally, the treatment reduced surface porosity to limit external water access and decreased the breakdown of C-S-H gel, with Ca(OH) precipitation contributing to stronger hydration phases and further minimizing OH ion leaching.
Article Abstract
The present study concerns the electrochemical treatment between steel embedment and an external mesh in mitigating OH ion leaching from the cement paste into external water, which was ensured by a microscopic observation on the surface of the cement paste specimen at the backscattered electron (BSE) image analysis and by measuring the leaching rate for OH ions with time. The electrochemical properties for the treatment included 1000 mA/m current density and 4 weeks duration. As a result, the pH at the electrochemical treatment in the external water accounted for 9.32 in the pH, while the untreated specimen indicated 13.46, implying a quite reduction of OH ion leaching to a water environment. The porosity on the surface was reduced to lower the access of external water, while the decomposition of C-S-H gel was lowered. Due to the precipitation of Ca(OH), a further solidification of hydration phases could lower OH ion leaching.
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| http://dx.doi.org/10.1016/j.jenvman.2024.121326 | DOI Listing |
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