THERMAL-CHARACTERISTICS OF AGED GRANULATED BLAST-FURNACE SLAGS

A series of aged granulated blast furnace slags were investigated by D TA. Devitrification characteristics were found to change as a function of age, and regular trends could be established. XRD showed the devit rification process to result predominantly in melilite formation and m inor amounts of merwinite, depending on slag age. Hydration of fresh s lags resulted in the gradual formation of hydrated species and calcite . DTA indicated that the devitrification profile also changed with the extent of hydration.