Structural evolution of binder gel in alkali-activated cements exposed to electrically accelerated leaching conditions

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The structural evolution of a binder gel in alkali-activated cements exposed to accelerated leaching conditions is investigated for the first time. Samples incorporating fly ash and/or slag were synthesized and were exposed to electrically accelerated leaching by applying a current density of 5 A/m2. The leaching behavior of the samples greatly depended on the binder gel formed in the samples. The N-A-S-H type gel abundant in fly ash-rich samples showed some extent of dissolution upon accelerated leaching, while slag-rich samples underwent hydration of the anhydrous slag after leaching. The obtained results are discussed in view of the degradation of the binder gel induced by accelerated leaching, and their potential performance under repository conditions where groundwater-induced leaching is the main durability concern.
Publisher
ELSEVIER
Issue Date
2020-04
Language
English
Article Type
Article
Citation

JOURNAL OF HAZARDOUS MATERIALS, v.387

ISSN
0304-3894
DOI
10.1016/j.jhazmat.2019.121825
URI
http://hdl.handle.net/10203/274180
Appears in Collection
CE-Journal Papers(저널논문)
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