Carbon-captured sodium hydroxide solution for sustainable alkali-activated slag

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The escalating impact of climate change, primarily driven by greenhouse gas emissions, has prompted global efforts to achieve carbon neutrality. Ordinary Portland cement production contributes approximately 7% to global carbon dioxide (CO2) emissions, necessitating innovative approaches for its sustainable production. A novel method is introduced that utilizes a sodium hydroxide (NaOH) solution captured with CO2 as an alkali activator for ground granulated blast furnace slag (GGBFS); it can substitute for the cement in producing construction materials. The method integrates CO2-dissolved alkaline solutions into the activation process of GGBFS, which results in the production of sustainable alkali-activated slag materials. Various concentrations of dissolved CO2 in the NaOH-based activator were used to evaluate their impact on compressive strength, setting time, and changes in phase composition. The results demonstrate that higher CO2 concentrations lead to increased compressive strength, but an excess hinders early-age strength development. X-ray diffraction and thermogravimetry analyses explain the phase changes during carbonation, emphasizing the role of CO2 in forming calcite and enhancing C -S -H production. Additionally, the study quantifies CO2 uptake, revealing a linear relationship with dissolved CO2 concentrations.
Publisher
ELSEVIER
Issue Date
2024-07
Language
English
Article Type
Article
Citation

SUSTAINABLE MATERIALS AND TECHNOLOGIES, v.40

ISSN
2214-9937
DOI
10.1016/j.susmat.2024.e00915
URI
http://hdl.handle.net/10203/319651
Appears in Collection
CE-Journal Papers(저널논문)
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