Effects of Fine Gangue on Strength, Resistivity, and Microscopic Properties of Cemented Coal Gangue Backfill for Coal Mining

Table 2

Proportions of the mix.

Mixture	Portland cement (kg/m^3)	Water (kg/m^3)	Fly ash (kg/m^3)	Gangue (kg/m^3)
				Fine (0–5 mm)	Coarse (10–15 mm)
M1 (20%)	190	380	380	190	760
M2 (30%)	190	380	380	285	665
M3 (40%)	190	380	380	380	570
M4 (50%)	190	380	380	475	475
M5 (60%)	190	380	380	570	380