Utilization of calcium carbide residue using granulated blast furnace slag

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The solidification and stabilization of calcium carbide residue (CCR) using granulated blast furnace slag was investigated in this study. CCR binding in hydrated slag was explored by X-ray diffraction, 29Si and 27Al magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy, and thermodynamic calculations. Mercury intrusion porosimetry and and compressive strength tests assessed the microstructure and mechanical properties of the mixtures of slag and CCR. C-A-S-H gel, ettringite, hemicarbonate, and hydrotalcite were identified as the main phases in the mixture of slag and CCR. The maximum CCR uptake by slag and the highest volume of precipitated solid phases were reached when CCR loading in slag is 7.5% by mass of slag, according to the thermodynamic prediction. This feature is also experimentally observed in the microstructure, which showed an increase in the pore volume at higher CCR loading.
Publisher
MDPI
Issue Date
2019-10
Language
English
Article Type
Article
Citation

MATERIALS, v.12, no.21, pp.3511

ISSN
1996-1944
DOI
10.3390/ma12213511
URI
http://hdl.handle.net/10203/268937
Appears in Collection
CE-Journal Papers(저널논문)
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