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Microscopic studies of the early hydration of calcium aluminate cements
Three complimentary microscopy techniques have been used to characterise the early stages of hydration of calcium aluminate cements (CACs). In particular the study has focused on the amorphous products wich form before the massive precipitation of hydrates at the end of the induction period. Analytical Transmission Electron Microscopy was used to characterise the products after drying and shows them to be rich in alumina. Atomic Force Microscopy provided high-resolution images of the same gel, showing its collodial structure. Finally, x-ray transmission micrascopy allowed the cement paste to be observed in the wet state over time as the chemical reaction occures. The x-ray images show that the formation of CAC hydrates takes place by a dissolution-precipitation process. The amorphous products form quckly after the addition of water in two locations, in the solution and around the anhydrous cement grains. A thickening of the layer around anhydrous grains is observed over time.
Microscopic studies of the early hydration of calcium aluminate cements
Three complimentary microscopy techniques have been used to characterise the early stages of hydration of calcium aluminate cements (CACs). In particular the study has focused on the amorphous products wich form before the massive precipitation of hydrates at the end of the induction period. Analytical Transmission Electron Microscopy was used to characterise the products after drying and shows them to be rich in alumina. Atomic Force Microscopy provided high-resolution images of the same gel, showing its collodial structure. Finally, x-ray transmission micrascopy allowed the cement paste to be observed in the wet state over time as the chemical reaction occures. The x-ray images show that the formation of CAC hydrates takes place by a dissolution-precipitation process. The amorphous products form quckly after the addition of water in two locations, in the solution and around the anhydrous cement grains. A thickening of the layer around anhydrous grains is observed over time.
Microscopic studies of the early hydration of calcium aluminate cements
Mikroskopische Untersuchungen von frisch abgebundenem Calziumaluminatzement
Lamour, V.H.R. (author) / Monteiro, P.J.M. (author) / Scrivener, K.L. (author) / Fryda, H. (author)
2001
12 Seiten, 12 Bilder, 11 Quellen
Conference paper
English
Microscopic Studies of the Early Hydration of Calcium Aluminate Cements
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