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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 21  1962
Some Investigations on the Activation of Slags of CaO-Ah03-Si02 System by DT A
BAIDYANA Til SAMADDAR AND DURGADAS LAHIRI
Pages : 75-85
DOI : 10.1080/0371750X.1962.11011987
Abstract
Slags of varying GaO content, having same SiO,fAl,O, ratio were hydrated in presence of varying proportions of lime and mixtures of lime and gypsum for different periods. The hydrated materials were subjected to DT A. When slags were hydrated in presence of lime only there appeared tetracalcium aluminate hydrate in all cases. Tobermorite and hydrogarnets were also possibly formed. Absor~ tion of lime was indicated in all cases. This decreased with incnease of GaO in the slag and increased with time. When slags were hyd7'ated in presence of lime and gypsum, the compounds identified were ettringite, crystalline solution of 'lowsulfate' aluminate sulfate double salt and tetracalcium aluminate hydrate. The former changed over to the latter when the proportion of gypsum in the mixture was low and lime in the mixture or GaO in the slag was high. Absorptz'on of lime during hydration in presence of lime and gypsum was always more than in presence of lime only and this increased with acidity of slag and with time. An explanation of the relative behaviour of different slags towards absorption of lime has been offered. A possible mechanism of slag activation is postulated.
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