1. Effect of supplementary cementitious materials on carbonation of cement pastes
- Author
-
Jean-Baptiste d'Espinose de Lacaillerie, Sylvain Pradelle, Mickael Saillio, Julien Vincent, Véronique Baroghel-Bouny, Matthieu Bertin, Comportement Physico-chimique et Durabilité des Matériaux (MAST-CPDM), Université Gustave Eiffel, Formulation, Microstructure, Modélisation et Durabilité des Matériaux de Construction (MAST-FM2D ), Ministère de la Transition Ecologique et Solidaire (MTES), Sciences et Ingénierie de la Matière Molle (UMR 7615) (SIMM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
TGA/DTG ,Materials science ,Aluminate ,Carbonation ,0211 other engineering and technologies ,ADJUVANT ,02 engineering and technology ,ALUMINATE ,CARBONATION ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Corrosion ,chemistry.chemical_compound ,021105 building & construction ,CARBONATATION ,CARBONATE ,General Materials Science ,CEMENT PASTE ,ADDITION MINERALE ,Metakaolin ,Cement ,SPECTRE ,Metallurgy ,SPECTROSCOPIE ,Slag ,Building and Construction ,PATE DE CIMENT ,021001 nanoscience & nanotechnology ,SCM ,chemistry ,Fly ash ,visual_art ,visual_art.visual_art_medium ,Cementitious ,0210 nano-technology ,MAS NMR SPECTROSCOPY - Abstract
Supplementary cementitious materials (SCM) are increasingly used in concrete for economical and environmental reasons. However, the durability of reinforced concretes against, for example, corrosion induced by carbonation varies. Here, the phase assemblage of various cement pastes with/without SCM (slag, fly ash and metakaolin), carbonated in accelerated conditions (1.5% CO2 and 65% RH) or not, has been investigated by various technics (XRD, TGA/DTA and 29Si as well as 27Al nuclear magnetic resonance spectroscopy) and compared. Results show that, after carbonation, anhydrous phases are less decalcified than hydrated phases. In cement pastes with slag, most of the calcium remains in the non-hydrated part of the slag. In contrast, the C-A,S-H phase is deeply modified and results show a coupling between C-A,S-H and hydrated aluminate phases during carbonation. In all carbonated materials, these phases tend to become an aluminosilicate gel, a very amorphous/disordered phase, containing less water than the original hydrates.
- Published
- 2021
- Full Text
- View/download PDF