Chloride binding of alkali-activated slag/fly ash cements
Article
Article Title | Chloride binding of alkali-activated slag/fly ash cements |
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ERA Journal ID | 3470 |
Article Category | Article |
Authors | Zhang, Jian, Shi, Caijiun and Zhang, Zuhua |
Journal Title | Construction and Building Materials |
Journal Citation | 226 (30), pp. 21-31 |
Number of Pages | 11 |
Year | 2019 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 0950-0618 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.conbuildmat.2019.07.281 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0950061819319555?via%3Dihub |
Abstract | In this study, the effects of slag/fly ash ratio, Na2O concentration, silicate modulus of activators and water/binder ratio on chloride binding of alkali-activated slag/fly ash cements (AACs) are studied, using the binding isotherms. The Langmuir isotherm suits better for chloride adsorption of most of AACs, and the amount of bound chloride is predominantly influenced by the chloride concentration. The Friedel’s salt only presents in alkali-activated slag samples after adsorption equilibrium. An appropriate slag/fly ash ratio could improve the chloride binding capacity due to the physical adsorption of N-A-S-H. The chloride binding of AACs decreases with the increased Na2O concentration but increases with the increased water/binder ratio, which is believed to be related to the OH− concentration in pore solutions. |
Keywords | Alkali-activated cements, Chloride binding, Binding isotherms, Slag, Fly ash, Friedel’s salt |
ANZSRC Field of Research 2020 | 400505. Construction materials |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Hunan University, China |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5865/chloride-binding-of-alkali-activated-slag-fly-ash-cements
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