Table 5 RSM-BBD test results.
From: Uniaxial compressive strength of cemented coal gangue backfill based on response surface methodology
Specimens code | X1 | X2 | X3 | Uniaxial compressive strength | |
|---|---|---|---|---|---|
1-day-old (Y1) | 28-day-old (Y2) | ||||
MPa | MPa | ||||
1 | 0.000 | 1.000 | 1.000 | 0.295 | 6.501 |
2 | − 1.000 | 1.000 | 0.000 | 0.407 | 5.746 |
3 | 1.000 | 1.000 | 0.000 | 0.532 | 7.239 |
4 | − 1.000 | − 1.000 | 0.000 | 0.317 | 5.225 |
5 | 1.000 | 0.000 | 1.000 | 0.331 | 6.449 |
6 | − 1.000 | 0.000 | 1.000 | 0.228 | 5.317 |
7 | 0.000 | 0.000 | 0.000 | 0.388 | 6.058 |
8 | 0.000 | − 1.000 | − 1.000 | 0.219 | 5.573 |
9 | 0.000 | 1.000 | − 1.000 | 0.288 | 6.472 |
10 | 1.000 | − 1.000 | 0.000 | 0.396 | 6.459 |
11 | 0.000 | 0.000 | 0.000 | 0.391 | 6.307 |
12 | 1.000 | 0.000 | − 1.000 | 0.317 | 6.650 |
13 | 0.000 | 0.000 | 0.000 | 0.403 | 6.134 |
14 | − 1.000 | 0.000 | − 1.000 | 0.235 | 5.286 |
15 | 0.000 | − 1.000 | 1.000 | 0.231 | 5.680 |
