Experimental Study on Diffusion Process of Sulfate Ion in Cemented Gangue Backfill Material

Table 1

Chemical and physical properties of the main raw materials of CGBM [4].

Major element	Cement (%)	Fly ash (%)	Gangue (%)
SiO2	22.36	52.42	35.46
Al2O3	5.53	32.48	16.11
Fe2O3	3.46	3.62	3.86
CaO	65.08	0.99	7.15
MgO	2.1	1.01	3.50
TiO2	—	1.26	0.80
Specific gravity	3.1	2.2	2.0
Specific surface (m^2/kg)	372	415	499
Fineness (>45 μm) (%)	5	42.54	53.78