jismart2024079: Study on The Effect of Adding MPCFA And MCFBFA To Alkali-Activated Slag Slurry on Its Flow Properties

Abstract

Alkali-activated cementitious material is a green inorganic cementitious material prepared from industrial solid waste. In this paper, commercially available class I fly ash (PFA), flotation-modified fly ash (MFA) and S95 granulated blast furnace slag powder (Slag) were used as raw materials to prepare the cementitious materials using alkaline activator, and the fluidity test was carried out to investigate the effect of flotation-modified fly ash on the fluidity performance of alkali-activated slag slurry. The results showed that when the dosage of fly ash was 0, the fluidity of the slurry was 244mm, and the addition of PFA and flotation-modified pulverized coal furnace fly ash (MPCFA) helped to improve the fluidity of alkali-activated slag slurry, and with the increase of the dosage of PFA, the fluidity was 277mm, 283mm, 295mm, 298mm, respectively, and with the increase of the dosage of MPCFA, the fluidity was 261mm, 266mm, 275mm, 286mm.The addition of flotation modified circulating fluidized bed fly ash (MCFBFA) decreases the fluidity of alkali activated slag slurry, with the increase of MCFBFA dosage, the fluidity is 238mm, 214mm, 139mm, 136mm, respectively, when MCFBFA dosage is 60wt%, the fluidity of the slurry is decreased considerably, compared with 40%wt%, the decrease was 35.1%.