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Cahit Bilim,Okan Karahan,Duran Ati,Serhan lkentapar 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.3
This paper reports the results of an investigation on the influences of admixtures and curing conditions on some properties ofAlkali-Activated Slag (AAS) mixtures with no cement. In the study, Shrinkage-Reducing (SRA) and superplasticizing and setretarding(WRRe) admixtures were used. For the slag activation, sodium metasilicate was used at two sodium concentrations, 4%and 6% by mass of slag. Setting time, flow loss of fresh mixtures, and shrinkage strain, carbonation, flexural and compressivestrength of hardened mixtures were measured. The test results showed that the admixtures generally had no impact on the settingtimes of AAS pastes. WRRe increased the flow rate of AAS mortars while SRA partially affected the flow values of AAS mortars. This paper reports the results of an investigation on the influences of admixtures and curing conditions on some properties ofAlkali-Activated Slag (AAS) mixtures with no cement. In the study, Shrinkage-Reducing (SRA) and superplasticizing and setretarding(WRRe) admixtures were used. For the slag activation, sodium metasilicate was used at two sodium concentrations, 4%and 6% by mass of slag. Setting time, flow loss of fresh mixtures, and shrinkage strain, carbonation, flexural and compressivestrength of hardened mixtures were measured. The test results showed that the admixtures generally had no impact on the settingtimes of AAS pastes. WRRe increased the flow rate of AAS mortars while SRA partially affected the flow values of AAS mortars. WRRe and SRA did not produce an important difference on the carbonation depths of AAS mortars. However, WRRe and especiallySRA admixtures decreased the shrinkage values of AAS mortars. Additionally, curing conditions had a significant effect on themechanical behavior in the hardened state of AAS mortars compared to Normal Portland Cement (NPC) mortars, and the strengthdevelopment of AAS mortars at early ages was very fast in comparison with NPC mortars when subjected to elevated temperature.