It is well known that the geopolymerization is an exothermic reaction. But, the measurement of heat flow at different temperatures using Isothermal calorimeter has displayed the decrease of the heat flow with increase of the temperature at which the measurement is carried out. which is the opposite of what is available in the literature. Moreover, for some temperature the heat flow is endothermic. So, I was wondering how this can be possible?
Hi Jean,
What exactly you mean "... with an increase of the temperature..." in isothermal calorimeter?? Do you mean different measurements at higher and higher temperatures?
As I know, the hydration process is always exothermal, but in some cases, with very low heat evolution, the endothermic effect could be observed due to the dissolution of some hydration products, which are not always stable in the alkali systems.
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