Study of the hydration of CaO powder by gas-solid reaction

Eric Serris (1, 2, 3) , Loïc Favergeon (1, 2, 3) , Michèle Pijolat (1, 2, 3) , Michel Soustelle (1, 2, 3) , Patrice Nortier (4) , Robert S. Gartner (5) , Thierry Chopin (5) , Ziad Habib (5)

1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
2 LPMG-EMSE - Laboratoire des Procédés en Milieux Granulaires
3 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs
4 LGP2 - Laboratoire Génie des procédés papetiers
5 Recherche et Développement

Hydration of CaO powders by reaction with water vapor has been studied in isothermal and isobaric conditions. Experimental tests were performed within the temperature range of 70 °C-420 °C and with a water vapor pressure from 5 to 160 hPa by means of a thermogravimetric device. Two powders, exhibiting slight differences in their physical properties, were studied. However, for one of the powders and under some temperature and pressure conditions, the reaction is not complete. The difference of behavior between both CaO powders was interpreted by considering the effect of the morphological properties on the mechanism of growth of Ca(OH)2.

Mots clés: Kinetics (A); Hydration (A); Microstructure (B); CaO (D); Anti-Arrhenius

Domaines: Génie des procédés

Eric Serris, Loïc Favergeon, Michèle Pijolat, Michel Soustelle, Patrice Nortier, et al.. Study of the hydration of CaO powder by gas-solid reaction. Cement and Concrete Research, 2011, 41 (10), pp.1078-1084. ⟨10.1016/j.cemconres.2011.06.014⟩. ⟨hal-00613013⟩