Research Article
The Dosage of Superplasticizer in Cemented Coal Waste Backfill Material Based on Response Surface Methodology
Table 2
Levels of factors of RSM.
| | Factor | Code | Levels of code | | ā1 | 0 | 1 |
| | Fly ash content (kg/m3) | A | 360 | 380 | 400 | | Fine gangue ratio (%) | B | 27 | 30 | 33 | | Mass concentration (%) | C | 79 | 80 | 81 |
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