The Dosage of Superplasticizer in Cemented Coal Waste Backfill Material Based on Response Surface Methodology

Table 3

Design of tests based on CCD and test results.

Run	Design of tests			Results of tests
	A	B	C	SP (% of binder)	Slump flow (mm)	VSI
1	1.000	1.000	1.000	0.702	440	0
2	−1.000	1.000	1.000	0.526	420	0
3	0.000	0.000	0.000	0.521	450	0
4	0.000	1.682	0.000	0.667	430	0
5	−1.682	0.000	0.000	0.281	430	0
6	1.000	−1.000	−1.000	0.075	470	1
7	0.000	0.000	1.682	1.253	420	0
8	0.000	0.000	−1.682	0.000	540	2
9	0.000	0.000	0.000	0.521	460	0
10	0.000	−1.682	0.000	0.596	460	0
11	0.000	0.000	0.000	0.521	445	0
12	0.000	0.000	0.000	0.521	450	0
13	−1.000	−1.000	1.000	1.003	465	0
14	1.000	−1.000	1.000	1.053	460	0
15	−1.000	1.000	−1.000	0.351	475	1
16	1.000	1.000	−1.000	0.251	500	1
17	−1.000	−1.000	−1.000	0.000	440	1
18	1.682	0.000	0.000	0.602	450	0
19	0.000	0.000	0.000	0.521	450	0
20	0.000	0.000	0.000	0.521	445	0