Article Dans Une Revue Cement and Concrete Research Année : 2019

Characterization of magnesium silicate hydrate (M-S-H)

Résumé

In this study, the structure of synthetic magnesium silicate hydrated phases (M-S-H) and the distribution of wateras a function of the Mg/Si ratio were investigated. Different analytical techniques indicated that M-S-H phasesare nano-crystallite hydrated phyllosilicates with relatively short coherence length (1.2 nm) and small particlesize (> 200m2/g). Zeta potential and cations exchange capacity measurements showed a negative surfacecharge on M-S-H from the deprotonation of the silanol groups. The negative surface charge is compensated byexchangeable magnesium or others cations. Combined analyses were used to characterize the water distributionin M-S-H revealing the following: i) confined water; its amount depends mainly on the relative humidity ii) veryconfined water (or possibly water coordinated to magnesium), and iii) hydroxyl groups bound to magnesium andto silicon.

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hal-02095214 , version 1 (19-03-2024)

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Ellina Bernard, Barbara Lothenbach, Christophe Chlique, Mateusz Wyrzykowski, Alexandre Dauzères, et al.. Characterization of magnesium silicate hydrate (M-S-H). Cement and Concrete Research, 2019, 116, pp.309-330. ⟨10.1016/j.cemconres.2018.09.007⟩. ⟨hal-02095214⟩
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