Investigating the Effect of Solid Components on Yield Stress for Cemented Paste Backfill via Uniform Design

Table 1

Uniform design experiments program (deviation coefficient ).

Type	Level	Mass fraction (%)	Ratio of cement versus solids	Coarse sand (%)	Gravel (%)
Uniform design	A1	79.0 (1)	1 : 7 (2)	7 (3)	16 (6)
	A2	79.5 (2)	1 : 9 (4)	16 (6)	13 (5)
	A3	80.0 (3)	1 : 11 (6)	4 (2)	10 (4)
	A4	80.5 (4)	1 : 6 (1)	13 (5)	7 (3)
	A5	81.0 (5)	1 : 8 (3)	1 (1)	4 (2)
	A6	81.5 (6)	1 : 10 (5)	10 (4)	1 (1)
Controlled trials	B1	80.0	1 : 8	0	0
	B2	80.0	1 : 8	14	0
	B3	80.0	1 : 8	0	14

Note: in this paper, the ratio of cement versus solids means cement versus sum of unclassified tailings, gravel, and coarse sand. The content of coarse sand means its proportion in overall materials. The content of gravel means its proportion in overall materials as well.