Chloride binding of alkali-activated slag/fly ash cements

Zhang, Jian and Shi, Caijiun and Zhang, Zuhua (2019) Chloride binding of alkali-activated slag/fly ash cements. Construction and Building Materials, 226 (30). pp. 21-31. ISSN 0950-0618

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: No
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 23 Jan 2020 00:06
Last Modified: 30 Jan 2020 01:57
Uncontrolled Keywords: Alkali-activated cements, Chloride binding, Binding isotherms, Slag, Fly ash, Friedel’s salt
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Identification Number or DOI: doi:0.1016/j.conbuildmat.2019.07.281
URI: http://eprints.usq.edu.au/id/eprint/37681

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