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]

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

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 >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Chimie, matériaux et procédés pour un nucléaire durable (CIMEND)

Submission date :

2019-09-25T14:38:02Z
2021-03-15T15:14:43Z