Category: Transient Plane Source
Author(s): G. C. Lukey, J. S. J. van Deventer, P. Duxson
Keywords: biphasic solids, environmental, first approximation, gel, geopolymers, Hashin-Strikman model, interconnectivity, intrinsic geopolymer binder, metakaolin-derived, potassium, relative humidity, relative humidity (RH), RH, sodium, Specific Heat, Temperature, Thermal Conductivity, Thermal Diffusivity
Abstract: Using the Transient Plane Source technique, various geopolymers, metakaolin-derived sodium (Na), sodium-potassium (NaK) and potassium (K), were tested to determine the effect of varying environmental conditions, such as temperature and humidity, on thermal conductivity. The results concluded that the thermal properties of the geopolymers derived from metakaolin are not greatly affected by the Si/Al ratio in the as-cured state. When the sodium geopolymers were tested at 50% relative humidity, the thermal conductivity increased by over 50%. Similar trends were noted for the NaK and K geopolymers, however the extent to their increase was not as notable.
Reference: Industrial and Engineering Chemistry Reseach, 45, 23 (2006) 7781-7788