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Unlocking the role of MgO in carbonation of alkali-activated slag cements

Abstract

The present study investigates the role of MgO in local structural changes occurring during the accelerated carbonation of alkali-activated slag (AAS) using synchrotron X-ray diffraction, mercury intrusion porosimetry, thermogravimetry, and nuclear magnetic resonance spectroscopy. The obtained results provide new insight showing that MgO incorporation in AAS reduced Al substitution in C-S-H and led to the formation of secondary phases, which significantly altered the route of carbonation. In particular, carbonation of secondary phases (i.e., layered double hydroxide) occurred and reduced the extent of carbonation in C-A-S-H. Consequently, a buffer-like system is provided, showing similar behavior but different principles involved in comparison with those in Portland cement. This effect was found dramatically to reduce the degrees of decalcification, dehydration and polymerization of C-A-S-H under accelerated carbonation condition.

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Publication details

The article was received on 28 Nov 2017, accepted on 18 Apr 2018 and first published on 28 Apr 2018


Article type: Research Article
DOI: 10.1039/C7QI00754J
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Unlocking the role of MgO in carbonation of alkali-activated slag cements

    S.M. Park, J. Jang and H.K. Lee, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C7QI00754J

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