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

Table 3

Concentrations of major ions in the raw material solution.

Elements (mg/L)	Mg	Si	Fe	Al	Ca	K	Na
Coal gangue	3.07	0.36	6.96	0.284	233	0.409	0.986
Fly ash	1.20	0.413	0.006	4.594	47.7	0.426	1.08