Experimental Study and Application of Inorganic Solidified Foam Filling Material for Coal Mines

Table 7

Experimental design of the sulphoaluminate cement content.

Sequence	Aggregate system			Water–cement ratio (%)	Foam		Gel slurry- foam ratio
	Cement (%)	SC (%)	Fly ash (%)		Foaming multiple	Dosage (mL)
1	100	0	0	50	10	200	1
2	95	5	0	50	10	200	1
3	90	10	0	50	10	200	1
4	85	15	0	50	10	200	1
5	80	20	0	50	10	200	1
6	75	25	0	50	10	200	1
7	70	30	0	50	10	200	1
8	65	35	0	50	10	200	1
9	60	40	0	50	10	200	1
10	55	45	0	50	10	200	1
11	50	50	0	50	10	200	1

Note. The gelling agent contained 0.1% water reducer; the water–cement ratio is the mass ratio of water to aggregate system; the gel-foam ratio is the ratio of the volume of the gel slurry to the volume of the foam.