Using GGBOS as the alkali activators in GGBS and GGBOS blended cements

This study analyzed the feasibility of ground-granulated blast-furnace slag (GGBS) and ground-granulated basic oxygen furnace slag (GGBOS) blended cements according to the standard specifications of ASTM C821-09 and ASTM C595/C595M-13. Through tests, this study verified that GGBOS can be used as alkali activators for GGBS and that the mixture proportions of S4I6 and S5I5 correspond with the physical and chemical requirements specified in ASTM C595/C595M-13. Among S3I7, S4I6, and S5I5, the mixture proportion of S4I6 exhibited the highest performance by reaching 90% of the compressive strength of ordinary Portland cement mortar.