Title :

On shrinkage and structure changes of pure and blended Portland concretes

Author(s) :

Zhang, Yao [Auteur]
Davy, Catherine [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
Albert-Mercier, Cyrille [Auteur]
Henry, Natacha [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Bertier, Pieter [Auteur]
Cazaux, Frederic [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Damidot, Denis [Auteur]
Bourbon, Xavier [Auteur]

Journal title :

Journal of the American Ceramic Society

Volume number :

100

Pages :

4131-4152

Publication date :

2017-04-05

HAL domain(s) :

Chimie/Chimie inorganique
Chimie/Matériaux

English abstract : [en]

This research investigates the long-term shrinkage and Relative Mass Loss (RML) of mature Portland concretes (pure CEMI and blended CEMV/A), at temperatures of 20°C and 80°C. When placed at 80°C and at relative humidities ...
Show more >This research investigates the long-term shrinkage and Relative Mass Loss (RML) of mature Portland concretes (pure CEMI and blended CEMV/A), at temperatures of 20°C and 80°C. When placed at 80°C and at relative humidities (RH) below 50-60%, concrete shrinkage increases with very slow stabilization kinetics by several hundreds of μm/m, while RML remains of about 0.2%. The origins of this continued shrinkage, simultaneously with limited RML, are investigated through the changes in (i) the pore structure of the concretes (by Mercury Intrusion Porosimetry and nitrogen adsorption) and in (ii) their solid phases (by TGA/DTA, FTIR spectroscopy coupled to DVS, quantitative X-Ray Diffraction by Rietveld analysis, and 29Si and 27Al MAS NMR). While the pore structure coarsens during continued shrinkage, several phase transformations occur, namely ettringite decomposition and changes in the silicate chain length of the C–A–S–H. While these structural changes are documented, their relationship with shrinkage/RML and to the pore structure is novel.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

ENSCL
CNRS
INRA
Centrale Lille
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

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

Submission date :

2019-09-25T14:06:49Z
2021-06-24T14:46:20Z