Effect of Tailings Fine Content on the Properties of Cemented Paste Backfill from the Perspective Packing Density

Table 1

Main chemical and physical properties of OPC and tailings.

Physical properties	OPC	Tailings	Chemical composition (%)	OPC	Tailings
Specific gravity	3.3	3.02	SiO2	21.43	65.3
<20 μm (%)	66.3	22.08	CaO	62.34	3.01
		31.51
		42.20
		51.63
		62.94
D10 (μm)	5.23	6.79	Fe2O3	5.06	15.52
		3.35
		2.08
		1.75
		1.24
D30 (μm)	10.18	30.13	Al2O3	4.25	2.89
		18.35
		10.28
		6.95
		4.89
D60 (μm)	17.8	86.23	MgO	2.61	0.58
		70.59
		45.54
		30.35
		17.57
Coefficient of uniformity	3.36	12.69	Na2O	0.41	2.88
		21.05
		23.33
		17.39
		14.18
Coefficient of curvature	1.1	1.55	K2O	0.73	8.76
		1.42
		1.05
		0.91
		1.10
—	—	—	SO3	1.48	0.32

Coefficient of uniformity = D₆₀/D₁₀; coefficient of curvature = (D₃₀)²/(D₁₀  ×  D₆₀).