Are calcium silicate hydrates (C-S-H) ...
Document type :
Article dans une revue scientifique
Permalink :
Title :
Are calcium silicate hydrates (C-S-H) present in alkali-activated glass cullet cement?
Author(s) :
Marchand, Baptiste [Auteur]
Lanier, S. [Auteur]
Davy, Catherine [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Laboratoire de mécanique et matériaux du génie civil [L2MGC]
Albert-Mercier, Cyrille [Auteur]
Tricot, Grégory [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Lanier, S. [Auteur]
Davy, Catherine [Auteur]

Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Laboratoire de mécanique et matériaux du génie civil [L2MGC]
Albert-Mercier, Cyrille [Auteur]
Tricot, Grégory [Auteur]

Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Journal title :
Materials Letters
Volume number :
219
Pages :
104-108
Publisher :
Elsevier
Publication date :
2018-05-15
English keyword(s) :
Ceramics
Amorphous materials
Microstructure
X ray techniques
Electron microscopy
Nuclear magnetic resonance
Amorphous materials
Microstructure
X ray techniques
Electron microscopy
Nuclear magnetic resonance
HAL domain(s) :
Chimie/Matériaux
English abstract : [en]
This contribution analyzes the structure of sodium-lime-silica (SLS) glass alkali-activated with NaOH. The mix forms an alkali-activated cement (AAC), which has proven to be mechanically resistant when immerged under water. ...
Show more >This contribution analyzes the structure of sodium-lime-silica (SLS) glass alkali-activated with NaOH. The mix forms an alkali-activated cement (AAC), which has proven to be mechanically resistant when immerged under water. The aim is to determine whether the presence of calcium in the glass powder may have contributed, together with alkali-activation, to forming calcium silicate hydrates (C-S-H), which are responsible for water resistance in hydrated Portland cement pastes. This is investigated by SEM, where needles similar to C-S-H in Portland paste are observed, then by X Ray Diffraction (XRD), but the pastes are too amorphous to allow any phase identification. Finally, 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) shows that C-S-H are at most 2–3% in the 4 M and 8 M NaOH AAC pastes, so that they cannot be considered responsible for the water resistance of SLS glass AAC pastes and mortars. The latter are rather formed of sodium silicate hydrates and/or silica gel.Show less >
Show more >This contribution analyzes the structure of sodium-lime-silica (SLS) glass alkali-activated with NaOH. The mix forms an alkali-activated cement (AAC), which has proven to be mechanically resistant when immerged under water. The aim is to determine whether the presence of calcium in the glass powder may have contributed, together with alkali-activation, to forming calcium silicate hydrates (C-S-H), which are responsible for water resistance in hydrated Portland cement pastes. This is investigated by SEM, where needles similar to C-S-H in Portland paste are observed, then by X Ray Diffraction (XRD), but the pastes are too amorphous to allow any phase identification. Finally, 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) shows that C-S-H are at most 2–3% in the 4 M and 8 M NaOH AAC pastes, so that they cannot be considered responsible for the water resistance of SLS glass AAC pastes and mortars. The latter are rather formed of sodium silicate hydrates and/or silica gel.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
Collections :
Research team(s) :
Chimie, matériaux et procédés pour un nucléaire durable (CIMEND)
Propriétés magnéto structurales des matériaux (PMSM)
Propriétés magnéto structurales des matériaux (PMSM)
Submission date :
2019-09-25T14:38:02Z
2021-03-15T15:14:43Z
2021-03-15T15:14:43Z