Chloride-bearing characteristics of alkali-activated slag mixed with seawater: Effect of different salinity levels

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This paper presents the microstructural properties of KOH-activated slag pastes produced with natural seawater under different salinity levels. The seawater-mixed samples exhibit higher 91-day strength compared to the control sample produced with deionized water. Their reduced total porosity and decrease in average pore size are closely related to the strength improvement. The dense microstructure is composed of reaction products resulting from the inclusion of seawater; these include Cl-hydrocalumite, Cl-hydrotalcite, AlClO, K2SO4, CaCO3, calcium aluminum iron oxide carbonate hydroxide hydrate, and aluminum chloride hydrate. In addition, CO32- in the CO3-hydrotalcite and CO3-hydrocalumite is replaced by chloride ions, and then a Cl-bearing phase is formed, leading to a higher bound chloride content. Lastly, in the single ocean current investigated in this study, the strength of seawater-mixed samples is weakly vulnerable to salinity variation.
Publisher
ELSEVIER SCI LTD
Issue Date
2020-09
Language
English
Article Type
Article
Citation

CEMENT & CONCRETE COMPOSITES, v.112

ISSN
0958-9465
DOI
10.1016/j.cemconcomp.2020.103680
URI
http://hdl.handle.net/10203/275997
Appears in Collection
CE-Journal Papers(저널논문)
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