Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 226, Issue -, Pages 21-31Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.07.281
Keywords
Alkali-activated cements; Chloride binding; Binding isotherms; Slag; Fly ash; Friedel's salt
Categories
Funding
- National Science Foundation of China [51638008, 51878263]
- Australian Research Council [DE170101070, DP160104149]
- Australian Research Council [DE170101070] Funding Source: Australian Research Council
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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. (C) 2019 Elsevier Ltd. All rights reserved.
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