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handle: 10261/34910
[FR]Dans la deuxième partie de cette recherche la tenue de résistance du nouveau ciment blanc face aux dissolutions agréssives de Na2SO4 et dans l'eau de mer est comparée à celle d'un ciment conventionnel. A tous les stages de l'étude le nouveau ciment s'est avéré très résistant à l'action des sulphates et de l'eau de mer. D'autre part, les mortiers de ciment blanc conventionnel se désintègrent complètement avant 56 jours d'immersion dans la dissolution de Na2SO4 et avant 360 jours d'immersion dans l'eau de mer. Cela est dû à l'expansion résultant de la formation d'ettringite et de gypse. Ces réactions, principalement celle de la formation d'ettringite, n'ont pas lieu dans les mortiers de ciment nouveau. La résistance aux sulphates du nouveau ciment blanc est la conséquence de sa composition minéralogique différente et spécialement de son bas contenu en C3A.
[EN]The second part of the investigation is concerned with the resistance of the novel cement to Na2SO4 solutions and sea-water compared to the behaviour of conventional white cement. It has been verified that the new white cement is strongly resistant to the action of sulfates and sea-water at all periods of testing. On the other hand mortars made with conventional white cement disintegrated completely within 56 days of immersion in Na2SO4 solutions and within 360 days of immersion in sea-water. This is due to expansion caused by the formation of ettringite and gypsum. These reactions, in particular the formation of ettringite, do not occur in mortars with the novel cement. The sulfate resistance of the new white cement is a consequence of its different mineralogical composition, mainly its low C3A content.
Peer reviewed
white cement, CaF2, CaSO4.2H2O., White cement
white cement, CaF2, CaSO4.2H2O., White cement
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