Fluidity of slag cement paste depending on types and replacement ratios of gypsum
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The aim of this research is evaluating the flow behavior of slag cement paste depending on various types of gypsum and theirreplacement ratio. In this research, gypsum was added for the slag cement to induce ettringite formation and thus achieveimproved and stable strength. Although natural anhydrite gypsum is primarily used for this purpose, various other types ofgypsum have been studied as potential additives for slag cement. However, these studies have focused on the reactionmechanisms or hardened properties. Hence, in this research, using workability measurement methods and a rheological testmethod, six-different types of gypsum were evaluated: anhydrite, α, and β hemihydrate, dihydrate, desulfurized gypsums andcombined gypsum of desulfurized and anhydrite gypsums. Experiment results showed that the dissolution rate of differentgypsums can significantly influence the fluidity of the pastes.
Abstract
The aim of this research is evaluating the flow behavior of slag cement paste depending on various types of gypsum and theirreplacement ratio. In this research, gypsum was added for the slag cement to induce ettringite formation and thus achieveimproved and stable strength. Although natural anhydrite gypsum is primarily used for this purpose, various other types ofgypsum have been studied as potential additives for slag cement. However, these studies have focused on the reactionmechanisms or hardened properties. Hence, in this research, using workability measurement methods and a rheological testmethod, six-different types of gypsum were evaluated: anhydrite, α, and β hemihydrate, dihydrate, desulfurized gypsums andcombined gypsum of desulfurized and anhydrite gypsums. Experiment results showed that the dissolution rate of differentgypsums can significantly influence the fluidity of the pastes.
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