Alkali-Activated Slag--Fly Ash Cements


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Title: Alkali-Activated Slag--Fly Ash Cements

Author(s): Jan Bijen and Hennie Waltje

Publication: Special Publication

Volume: 114


Appears on pages(s): 1565-1578

Keywords: activators; alkali-aggregate reactions; alkalies; carbonation; blast furnace slag; fly ash; freeze-thaw durability; lignosulfonate; slag cements; Materials Research

Date: 5/1/1989

Cements consisting of 60 percent ground granulated blast furnace slag and 40 percent fly ash activated by 7 percent sodium hydroxide have been investigated. Various slags were used, including some laboratory-made synthetic slags. The influence of additives like superplasticizers and defoaming agents has been examined. The most favorable composition with respect to strength development has been subjected to a durability testing program. A negative aspect appeared to be the carbonation resistance, which is low in comparison with portland cement. Carbonation leads to a decrease in strength. Other properties were favorable.