2018_EJRNL_PP_MINGYUE_WU_1.pdf
Terbatas Resti Andriani
» ITB
Terbatas Resti Andriani
» ITB
Environmentally friendly and cheap composite green cementitious materials have been prepared from carbide slag, fly ash, fluegas desulphurisation (FGD) gypsum, and granulated blast-furnace slag (GBFS) without using cement clinker. Orthogonal testing
was used to investigate the effects of the raw materials on the amount of water required for reaching standard consistency and
consistency, setting time, slump value, and strength of the produced materials after curing for 7 d and 28 d. Scanning electron
microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the analysis of the sample microstructure and hydration
products as well as for the exploration of possible hydration mechanisms. We found that, among the utilised raw materials, the
addition of FGD gypsum had the most significant effect on the setting time and amount of water required for reaching standard
consistency and consistency, while the addition of GBFS deeply affected the slump value. +e optimal activation results were
obtained when the mass ratio of carbide slag : fly ash : GBFS : FGD gypsum was equal to 12.1 : 60.6 :18.2 : 9.1.