Improved Reactivity of Fly Ash-Slag Geopolymer by the Addition of Silica Fume

Table 1

Chemical composition of the binder materials.

Oxide (wt.%)	Fly ash	Blast furnace slag (BFS)	Silica fume 1 (SF1)	Silica fume 2 (SF2)	Zirconium silica fume
CaO	3.0	43.7	0.3	0.4	0.2
SiO2	62.8	34.7	96.0	96.4	93.0
Al2O3	21	12.2	0.5	0.7	0.8
Fe2O3	7.4	0.5	—	0.2	0.6
SO3	0.8	3.3	1.5	0.2	—
MgO	0.9	3.4	0.3	0.5	0.5
P2O	1.4	0.7	0.9	0.8	4.4
K2O	0.9	0.5	0.4	0.7	0.02
TiO2	1.2	0.5	—	—	—