Role of Al in the crystal growth of alkali-activated fly ash and slag under a hydrothermal condition

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The present study investigates the role of Al in the evolution of the crystalline phases of an alkali-activated binder. Samples were synthesized corresponding to the binder composition with various Al2O3/Na2O and MgO/binder ratios in a hydrothermal condition. Thermodynamic modelling was carried out to predict the effect of the Al content in the binder composition on the formation of Al-bearing phases. The test results showed that an increasing Al content led to the alteration of the predominant zeolite phases in the alkali-activated binder. In addition, MgO incorporation enhanced the reaction degree of hydration in the alkali-activated system and the crystal growth, specifically hydrotalcite-like phase. Consequently, the formed reaction products had a great effect on the pore characteristics of the alkali-activated binder given their variations in the crystal structure.
Publisher
ELSEVIER SCI LTD
Issue Date
2020-04
Language
English
Citation

CONSTRUCTION AND BUILDING MATERIALS, v.239, pp.117842

ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2019.117842
URI
http://hdl.handle.net/10203/271789
Appears in Collection
CE-Journal Papers(저널논문)
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