Thermal properties of hydrating calcium aluminate cement pastes / Neven Ukrainczyk in Cement and concrete research, Vol. 40 N° 1 (Janvier 2010)  

Public ISBD [article]  inCement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 128-136 Titre : Thermal properties of hydrating calcium aluminate cement pastes Type de document : texte imprimé Auteurs : Neven Ukrainczyk, Auteur ; Tomislav Matusinovic, Auteur Article en page(s) : pp. 128-136 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Calcium aluminate cement Hydration Thermal properties Transient hot wire method Inverse problem Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : As the hydration of calcium aluminate cements (CAC) is highly temperature dependent, yielding morphologically and structurally different hydration products that continuously alter material properties, a good knowledge of thermal properties at early stages of hydration is essential. Thermal diffusivity and thermal conductivity during CAC hydration was investigated by a transient method with a numerical approach and a transient hot wire method, respectively. For hydration at 15 °C (formation of mainly CAH10), thermal diffusivity shows a linear decrease as a function of hydration degree, while for hydration at 30 °C there is a linear increase of thermal diffusivity. Converted materials exhibited the highest values of thermal diffusivities. The results on sealed converted material indicated that thermal conductivity increased with an increase in temperature (20–80 °C), while thermal diffusivities marginally decreased with temperature. The Hashin–Shtrikman boundary conditions and a simple law of mixtures were successfully applied for estimating thermal conductivity and heat capacity, respectively, of fresh cement pastes. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...] [article] Thermal properties of hydrating calcium aluminate cement pastes [texte imprimé] / Neven Ukrainczyk, Auteur ; Tomislav Matusinovic, Auteur . - pp. 128-136. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 1 (Janvier 2010) . - pp. 128-136 Mots-clés : Calcium aluminate cement Hydration Thermal properties Transient hot wire method Inverse problem Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : As the hydration of calcium aluminate cements (CAC) is highly temperature dependent, yielding morphologically and structurally different hydration products that continuously alter material properties, a good knowledge of thermal properties at early stages of hydration is essential. Thermal diffusivity and thermal conductivity during CAC hydration was investigated by a transient method with a numerical approach and a transient hot wire method, respectively. For hydration at 15 °C (formation of mainly CAH10), thermal diffusivity shows a linear decrease as a function of hydration degree, while for hydration at 30 °C there is a linear increase of thermal diffusivity. Converted materials exhibited the highest values of thermal diffusivities. The results on sealed converted material indicated that thermal conductivity increased with an increase in temperature (20–80 °C), while thermal diffusivities marginally decreased with temperature. The Hashin–Shtrikman boundary conditions and a simple law of mixtures were successfully applied for estimating thermal conductivity and heat capacity, respectively, of fresh cement pastes. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235562%23 [...]

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