Effect of Desliming of Tailings on the Fresh and Hardened Properties of Paste Backfill Made from Alkali-Activated Slag

Table 2

Chemical, physical, and mineralogical properties of binders.

Chemical composition	OPC (wt.%)	Slag (wt.%)	Physical properties	OPC	Slag
SiO2	21.88	39.75	Specific gravity	3.07	2.89
Al2O3	4.74	10.91	Specific surface area (cm^2/g)	4120	4600
Fe2O3	2.90	0.80	Retained on 45 μm sieve (%)	2.17	4.15
CaO	65.0	38.02	Retained on 32 μm sieve (%)	7.48	9.60
MgO	1.40	5.92	Mineralogical composition (%)
TiO2	0.19	0.51	C3S	50.42	–
Cr2O3	0.01	0.01	C2S	27.76	–
Na2O	0.39	0.32	C3A	7.66	–
K2O	0.75	1.19	C4AF	8.83	–
MnO	0.12	1.54	Basicity index
P2O5	0.06	<0.01		–	1.03
Free lime	1.04	–
Loss on ignition	2.5	0.20
SO3	2.67	1.62
Reactive SiO2	–	39.10