Research Article
Experimental Study on Low-Strength Similar-Material Proportioning and Properties for Coal Mining
Table 1
Orthogonal study of similar materials.
| | Level | Factor | | Sand-binder ratio (A) | Cement ratio
fly ash : gypsum (B) |
| | 1 | 6 : 1 | 8 : 2 | | 2 | 7 : 1 | 7 : 3 | | 3 | 8 : 1 | 6 : 4 | | 4 | 9 : 1 | 5 : 5 |
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