Moisture Desorption Isotherms and Thermodynamic Characteristic of Prehydrated and Extruded GCL

An experimental investigation into the drying of pre-hydrated and extruded GCL is
presented in this paper. Moisture desorption isotherm at temperature from 20 to 40°C and water
activity from 0.20 to 0.70 were determined using the static gravimetric method. The moisture
isotherms were sigmoid shaped and were influenced by the thermal environment. The Guggenheim-
Aderson-DeBoer (GAB) was used to fit experimental values using a non-linear regression analysis.
GAB model was appropriate to predict the desorption equilibrium moisture content of pre-hydrated
and extruded GCL for the range of temperatures and water activities studied. Finally, an expression
for predicting the thermal property was developed.

Citation:
Loh, E.W; Wijeyesekera, D.C. (2008) ‘Moisture Desorption Isotherms and Thermodynamic Characteristic of Prehydrated and Extruded GCL’ Proceedings of the AC&T, pp 148 -153..