Performance of CO2-cured alkali-activated blast-furnace slag incorporating magnesium oxide

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This study investigated characteristics of alkali -activated slags incorporating magnesium oxide (MgO) subjected to CO 2 curing. The samples were prepared by adding 2%, 5%, and 10% MgO to the total binder mass. The mixture was activated with potassium hydroxide (KOH) and cured in a CO 2 incubator for 3 days. The compressive strength of the MgO-incorporated CO 2 -cured alkali -activated slag was higher than that of the conventional alkali -activated slag at all ages up to 28 days. No reduction in the strength was observed over time. The enhanced strength was independent of MgO content. Combined X-ray diffraction with thermogravimetric analysis showed MgO accelerated the alkali activation by dissolving more Ca and Al ions from the slag. CO 2 curing supplied carbonate ions and produced calcium carbonate and hydrotalcite. The former aided in achieving a higher level of early age strength and gel pore refinement. Larger amount of the carbonates was formed under high MgO contents, which further enhanced the strength.
Publisher
Elsevier SCI LTD
Issue Date
2024-05
Language
English
Article Type
Article
Citation

CONSTRUCTION AND BUILDING MATERIALS, v.429

ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2024.136462
URI
http://hdl.handle.net/10203/319482
Appears in Collection
CE-Journal Papers(저널논문)
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