caa a22 4500 528785168 20190713030951.0 cr unu---uuuuu 180924s2016 xx s 000 0 eng 10.3929/ethz-b-000114637 doi 10.1038/ncomms10952 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/114637 Understanding silicate hydration from quantitative analyses of hydrating tricalcium silicates [Elektronische Daten] [Elizaveta Pustovgar, Rahul P. Sangodkar, Andrey S. Andreev, Marta Palacios, Bradley F. Chmelka, Robert J. Flatt, Jean-Baptiste d'Espinose de Lacaillerie] Nat Commun Open access ethresearch 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. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Pustovgar Elizaveta joint author Sangodkar Rahul P. joint author Andreev Andrey S. joint author Palacios Marta joint author Chmelka Bradley F. joint author Flatt Robert J. joint author d'Espinose de Lacaillerie Jean-Baptiste joint author Nature Communications London : Nature Publishing Group 7, p. 10952 2041-1723 http://hdl.handle.net/20.500.11850/114637 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/114637 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Pustovgar Elizaveta joint author ETHRESEARCH 700 1- Sangodkar Rahul P. joint author ETHRESEARCH 700 1- Andreev Andrey S. joint author ETHRESEARCH 700 1- Palacios Marta joint author ETHRESEARCH 700 1- Chmelka Bradley F. joint author ETHRESEARCH 700 1- Flatt Robert J. joint author ETHRESEARCH 700 1- d'Espinose de Lacaillerie Jean-Baptiste joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 7, p. 10952 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access