Understanding silicate hydration from quantitative analyses of hydrating tricalcium silicates
Sangodkar, Rahul P.
Andreev, Andrey S.
Chmelka, Bradley F.
Flatt, Robert J.
d’Espinose de Lacaillerie, Jean-Baptiste
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
Silicate hydration is prevalent in natural and technological processes, such as, mineral weathering, glass alteration, zeolite syntheses and cement hydration. Tricalcium silicate (Ca3SiO5), the main constituent of Portland cement, is amongst the most reactive silicates in water. Despite its widespread industrial use, the reaction of Ca3SiO5 with water to form calcium-silicate-hydrates (C-S-H) still hosts many open questions. Here, we show that solid-state nuclear magnetic resonance measurements of 29Si-enriched triclinic Ca3SiO5 enable the quantitative monitoring of the hydration process in terms of transient local molecular composition, extent of silicate hydration and polymerization. This provides insights on the relative influence of surface hydroxylation and hydrate precipitation on the hydration rate. When the rate drops, the amount of hydroxylated Ca3SiO5 decreases, thus demonstrating the partial passivation of the surface during the deceleration stage. Moreover, the relative quantities of monomers, dimers, pentamers and octamers in the C-S-H structure are measured. Show more
Journal / seriesNature Communications
Pages / Article No.
PublisherNature Publishing Group
Organisational unit03891 - Flatt, Robert J. / Flatt, Robert J.
02606 - Institut für Baustoffe (IfB) / Institute for Building Materials
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