Effect of electrochemical treatment in mitigating OH− leaching from cement paste and its microscopic analysis at BSE imaging
- Authors
- Hwang, Woongik; Youn, Bum Hee; Ann, Ki Yong
- Issue Date
- Jun-2024
- Publisher
- Academic Press
- Keywords
- Ca(OH)2; C–S–H gel; Electrochemical treatment; OH− ion leaching
- Citation
- Journal of Environmental Management, v.362, pp 1 - 9
- Pages
- 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of Environmental Management
- Volume
- 362
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/119303
- DOI
- 10.1016/j.jenvman.2024.121326
- ISSN
- 0301-4797
1095-8630
- 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/m2 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)2, a further solidification of hydration phases could lower OH− ion leaching. © 2024 Elsevier Ltd
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