Abstract
Weak base Alkali-activated materials (AAM) is a potential approach to further reduce energy consumption and eco-friendly. Long setting time and low early strength limit the application in engineering. In this study, steel slag (SS) was used as a partial-substitution precursor of ground granulated blast furnace slag (GGBFS), and wet-grinded SS-GGBFS (WSS-GS) binary binders activated by sodium sulfate were designed. The results showed that the alkalinity of WSS-GS slurry was improved by the addition of SS, and the early hydration reaction and strength were promoted greatly. However, excessive SS was harmful to strength development at later age for quantity reduction of hydration products and microstructure deterioration. 15%SS-85%GGBFS activated by 3% Na2O-E sodium sulfate was verified with a desired performance, initial setting time was shortened by 60% and 1 d compressive strength was increased by 91% compared to GGBFS. These results provide guidance on designing of weak base-activated slag system and utilization of mass SS.
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