Bernard, Ellina Françoise MichelleEllina Françoise MichelleBernard0000-0001-5519-2861Lothenbach, BarbaraBarbaraLothenbachChlique, ChristopheChristopheChliqueWyrzykowski, MateuszMateuszWyrzykowskiDauzeres, AlexandreAlexandreDauzeresPochard, IsabelleIsabellePochardCau-Dit-Coumes, CélineCélineCau-Dit-Coumes2024-10-282024-10-282019-02https://boris-portal.unibe.ch/handle/20.500.12422/183856In this study, the structure of synthetic magnesium silicate hydrated phases (M-S-H) and the distribution of water as a function of the Mg/Si ratio were investigated. Different analytical techniques indicated that M-S-H phases re nano-crystallite hydrated phyllosilicates with relatively short coherence length (1.2 nm) and small particle size (> 200m2/g). Zeta potential and cations exchange capacity measurements showed a negative surface charge on M-S-H from the deprotonation of the silanol groups. The negative surface charge is compensated by exchangeable magnesium or others cations. Combined analyses were used to characterize the water distribution in M-S-H revealing the following: i) confined water; its amount depends mainly on the relative humidity ii) very confined water (or possibly water coordinated to magnesium), and iii) hydroxyl groups bound to magnesium and to silicon.en500 - Science::550 - Earth sciences & geology600 - Technology::690 - Building & constructionarticle10.7892/boris.13587610.1016/j.cemconres.2018.09.007