Optimization Analysis of Mechanical Properties of Fly Ash-Based Multicontent Gasification Slag Paste Filling Material

Table 1

Factors and levels in the design scheme of the central composite experiment.

Factor	Level
	−1	0	1
X1 (mass fraction/%)	75	80	85
X2 (content of gasification slag in solid/%）	15	20	25
X3 (m(c):m(FA))	1 : 5	1 : 6	1 : 7
X4 (content of desulfurized gypsum in solid/%）	6	9	12