Fully Mechanized Mining Technology and Practice of Water Conservation with Large Gravity Filling of Aeolian Sand-Like Paste

Table 1

Experimental results of backfill material proportioning.

Number	Concentration/%	Water-sand ratio	Viscosity coefficient/(Pa·s)	Yield stress/Pa	Initial mobility/mm	Final setting time/h	Bleeding rate/%	Strength at different ages/MPa
								12 h	3 d	7 d	28 d
1	69	1 : 0.7	0.096	2.31	266	6.2	0.9	0.21	2.15	3.30	4.92
2	72	1 : 1	0.256	4.85	206	6.2	1.0	0.19	2.20	3.31	4.77
3	75	1 : 1.3	0.848	8.78	190	5.8	1.3	0.25	2.56	3.44	5.02
4	69	1 : 1	0.110	2.43	247	6.5	1.2	0.19	1.98	3.12	4.67
5	72	1 : 1.3	0.261	5.04	210	6.0	1.2	0.20	2.11	3.23	4.80
6	69	1 : 1.3	0.124	2.61	240	6.3	1.5	0.18	1.92	3.02	4.55
7	75	1 : 0.7	0.243	4.52	208	6.0	0.5	0.24	2.41	3.53	4.98
8	72	1 : 0.7	0.238	4.37	214	6.1	0.6	0.17	2.26	3.34	4.87
9	75	1 : 1	0.264	4.96	193	6.1	0.8	0.21	2.32	3.48	4.90