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C. S1, , p.40

C. S3, , p.0

, Those methods might bring the stronger evidences needed to support the CO2 access limiting effect attributed to the surface and interlayer's Al species, which would bring deeper understanding on the nature of those Al species

, ATG), les pâtes modèles durcies aux C/S ? 1,40 sont essentiellement constituées de C-S-H et démontrent une faible dispersion de leurs rapports C/S (MEB-EDS) nous assurant ainsi du contrôle de la chimie et de la minéralogie escompté pour les matériaux fabriqués. L'estimation de la teneur en C-S-H montre une teneur plus élevée de C-S-H dans les pâtes à plus bas pH

, Les pâtes modèles ont démontré avec l'abaissement du C/S, une gamme similaire de porosité et un raffinement de la porosité sondée

, Cette observation est attribuée au comblement de la porosité générée par les teneurs plus élevées en C-S-H. A l'échelle nanométrique les propriétés des C-S-Hs formés sont similaires à celles répertoriées par la littérature. Le recours à la RMN du noyau 29 Si a permis de mettre en évidence des propriétés structurales (distribution d'environnement 29 Si, taille moyenne des chaines de silicates) au sein des pâtes synthétiques modèles similaires aux matériaux industriels, similaire à celle des matériaux bas-pH

, Des points de faiblesses nous sont apparus, spécialement sur les matériaux aux plus bas rapports C/S, cela comprend la présence de fissures à bas rapports C/S. Nous avons proposé comme explication à la présence de ces fissures, la réactivité donnant lieu aux C-S-Hs à bas rapports C/S et les propriétés physicochimiques de ces mêmes C-S-Hs

, Au vu des caractéristiques observées, les matériaux modèles ont démontré des propriétés permettant l'acquisition d'un spectre large de connaissances touchant notamment aux propriétés intrinsèques des C-S-Hs de l'état sain à l'état carbonaté, aux conséquences liées à d'autres pathologies de matériaux cimentaires

, Le second chapitre traite du lien entre propriétés structurales à l'échelle nanométrique et réactivité. Dans cette partie les matériaux utilisés sont des poudres de C(-A)-S-Hs, des silicates de calciums hydratés à teneurs variables en aluminium. Les matériaux à bas-pH incorporent

, L'aluminium est connu pour modifier le motif dreierketten