Structural characterization of magnesium silicate hydrate: towards the design of eco-sustainable cements

Dalton Transactions : an International Journal of Inorganic Chemistry
M TonelliP Baglioni

Abstract

Magnesium-based cement is one of the most interesting eco-sustainable alternatives to standard cementitious binders. The reasons for the interest towards this material are twofold: (i) its production process, using magnesium silicates, brine or seawater, dramatically reduces CO2 emissions with respect to Portland cement production, and (ii) it is very well suited to applications in radioactive waste encapsulation. In spite of its potential, assessment of the structural properties of its binder phase (magnesium silicate hydrate or M-S-H) is far from complete, especially because of its amorphous character. In this work, a comprehensive structural characterization of M-S-H was obtained using a multi-technique approach, including a detailed solid-state NMR investigation and, in particular, for the first time, quantitative (29)Si solid-state NMR data. M-S-H was prepared through room-temperature hydration of highly reactive MgO and silica fume and was monitored for 28 days. The results clearly evidenced the presence in M-S-H of "chrysotile-like" and "talc-like" sub-nanometric domains, which are approximately in a 1 : 1 molar ratio after long-time hydration. Both these kinds of domains have a high degree of condensation, corresponding...Continue Reading

References

Jan 6, 2010·ChemSusChem·Andrew J HuntJames H Clark
May 12, 2010·Journal of the American Chemical Society·Aditya RawalBradley F Chmelka
Mar 11, 2011·Journal of Colloid and Interface Science·Francesca RidiPiero Baglioni
Sep 17, 2011·ChemSusChem·Elsje Alessandra QuadrelliSiglinda Perathoner
Apr 3, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Sam A WallingJohn L Provis

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Citations

Feb 22, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Jaime CuevasRaúl Fernández
Jan 22, 2021·Physical Chemistry Chemical Physics : PCCP·Giovanni FerraroPiero Baglioni
Apr 24, 2021·Journal of Colloid and Interface Science·Monica TonelliMassimo Bonini

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