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Extra info for Interfaces in Cementitious Composites

Sample text

All of the above illustrations represent specimens whose fracture surface ran within the paste rather than at the interface. As indicated earlier, some specimens, especially dolomite-plain cement paste composites, failed at the interface. Figure 8 (a) shows the general appearance of the dolomite rock side of one such specimen. The oscillatory character of the trace of the failure surface is apparent at this low magnification. At the higher magnification of Figure 8 (b) some additional roughness of the surface can be seen, as well as the existence of a local crack segment produced within the rock.

Characterization of Interfacial Microstructure 27 Fig. 4. 38. 4 Microstructural analysis The fibre-matrix transition zone is analyzed through BSEI following Scrivener et al. (1988) procedures done for high strength concretes. The EDS analysis is also done to identify the major chemical elements. The specimens were prepared following Kjellsen et al. (1991) recommendations; this preparation consists basically of: a) stoppage of cement hydration with acetone; b) impregnation of the specimens with a low viscosity resin in a vacuum chamber; c) polishing the analyzed surface with silicon carbide and later with a diamond paste; d) recovering the surface with a carbon layer.

Ces cendres sont nouvelles par leur granularité, par la forme des particules (grains sphériques plus rares ou absents) et par la nature minéralogique de leurs constituants. Leur comportement rhéologique dans les mortiers et les bétons est modifié en conséquence. Ces modifications rhéologiques ont-elles des répercussions au niveau de la structure de 1’auréole de transition? Cet article apporte des éléments de réponse qui concernent essentiellement la structuration de 1’auréole et ses caractéristiques initiales.

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