SETTING TIME OF ALKALI-ACTIVATED FLY ASH AND SLAG GEOPOLYMER COMPOSITES ADMIXED COARSE COPPER-SLAG AS FINE AGGREGATE

Geopolymer composites prepared from class F fly ash and ground granulated blast-furnace slag activated by sodium hydroxide and sodium silicate solution as the binder, and coarse copper slag as the aggregate were investigated with emphasis on setting time. In this study, the initial setting times range from 77 min to 102 min and their final setting times are longer than 180 min. The activator solute content of NaOH+ Na2SiO3 would almost shorten the setting time when the dosage is increased. In terms of setting times, Na2SiO3 has more excitative effect on mixture of GGBFS and FA than NaOH.