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Article Dans Une Revue Journal of the American Ceramic Society Année : 2012

Stability of Monosulfate in the Presence of Iron

Résumé

Monosulfate (3CaO*(AlxFe1x)2O3*CaSO4*12H2O) is an AFm phase that can be formed during the hydration of cement. Fe-containing monosulfate and (Al,Fe) mixed monosulfate were synthesized and characterized. Fe-monosulfate is composed of a positively charged main layer [Ca2Fe(OH)6]+ and a negatively charged interlayer [1/2SO4*3H2O]−, crystallizes in the trigonal R 3 symmetry, and is isotypic with Al-monosulfate. The solubility product at 25°C was determined to be 31.57. The formation of solid solution due to Al-Fe substitution in the main layer structure of monosulfate was observed. Based on the evolution of the unit cell parameters and the thermodynamic investigations, a presence of solid solution from 0.0 to 0.45 Al/(Al + Fe) ratio and a miscibility gap in the range 0.45 < Al/(Al + Fe) ratio <0.95 is suggested.
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Dates et versions

hal-00785997 , version 1 (07-02-2013)

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  • HAL Id : hal-00785997 , version 1

Citer

Belay Zeleke Dilnesa, Barbara Lothenbach, Guillaume Renaudin, Adrian Wichser, Erich Wieland. Stability of Monosulfate in the Presence of Iron. Journal of the American Ceramic Society, 2012, 95, pp.3305-3316. ⟨hal-00785997⟩
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