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

Table 2

Response surface design and results.

No.	Level				Early compressive strength (MPa)			No.	Level				Early compressive strength (MPa)
	X1	X2	X3	X4	3 d	7 d	14 d		X1	X2	X3	X4	3 d	7 d	14 d
1	−1	−1	0	0	0.544	0.868	2.4	16	0	1	1	0	1.404	2.173	3.3
2	1	−1	0	0	0.588	0.704	1.2	17	−1	0	−1	0	1.380	1.673	2.6
3	−1	1	0	0	1.252	1.877	2.3	18	1	0	−1	0	1.016	1.200	1.8
4	1	1	0	0	1.468	2.153	3.5	19	−1	0	1	0	0.936	1.032	1.2
5	0	0	−1	−1	1.080	2.141	3.1	20	1	0	1	0	0.740	0.844	0.9
6	0	0	1	−1	0.908	1.548	3.5	21	0	−1	0	−1	0.736	0.848	0.9
7	0	0	−1	1	1.032	1.929	3.1	22	0	1	0	−1	0.992	1.092	2.1
8	0	0	1	1	0.748	1.232	2.6	23	0	−1	0	1	1.588	2.561	2.6
9	−1	0	0	−1	1.256	2.197	4.1	24	0	1	0	1	1.460	2.157	2.2
10	1	0	0	−1	0.920	1.204	1.8	25	0	0	0	0	0.876	1.236	1.9
11	−1	0	0	1	1.088	1.348	1.5	26	0	0	0	0	0.932	1.312	1.5
12	1	0	0	1	0.656	0.812	1.1	27	0	0	0	0	0.764	1.180	1.7
13	0	−1	−1	0	0.712	0.760	1.2	28	0	0	0	0	0.984	1.164	1.6
14	0	1	−1	0	1.072	1.753	3.0	29	0	0	0	0	0.976	1.304	1.6
15	0	−1	1	0	0.640	0.608	0.8	Response surface design method-central combination design method