Naslov
Thermal properties of hydrating calcium aluminate cement pastes

Autori
Ukrainczyk, Neven ; Matusinović, Tomislav

Izvornik
Cement and concrete research : including advanced cement based materials (0008-8846) 40 (2010), 1; 128-136

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
calcium aluminate cement ; hydration ; thermal properties ; hot wire method ; inverse problem

Sažetak
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 the 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.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Kemijsko inženjerstvo

POVEZANOST RADA