Abstract
In this research, the alkali activated reaction kinetics of a Type-F fly ash with calcium hydroxide (CH) and water were studied at temperatures between 25 and 60 degrees C. Thermogravimetric analysis was used to determine the CH consumption and production of hydrates as a function of hydration temperature and time for various CH/fly ash ratios. Results show that the reaction rate, reaction stoichiometry, and activation energy are dependent on the CH/ash ratio. The reaction rate was also found to be a function of the extent of reaction of both CH and fly ash phases. Various kinetic models were considered, including those proposed by Knudsen and Avrami; these had limited applicability. A model is suggested providing a broader fit to the observed data.
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