Research Article
Application of High-Strength Lightweight Concrete in Gob-Side Entry Retaining in Inclined Coal Seam
Table 3
Analysis of orthogonal experimental results.
| | Factors | Water-cement ratio, A | Volume rate of sand, B | Content of fly ash, C | Silica fume dosages, D | Slump (cm) | Wet density (kg/m3) | 28-day compressive strength (MPa) |
| | Test number | 1 | I (0.28) | I (0.4) | I (10) | I (0) | 26 | 2060 | 58.5 | | 2 | I (0.28) | II (0.45) | II (15) | II (5) | 23 | 2060 | 59.5 | | 3 | I (0.28) | III (0.50) | III (20) | III (10) | 19 | 2000 | 63.8 | | 4 | II (0.3) | I (0.4) | II (15) | III (10) | 14 | 1995 | 54.5 | | 5 | II (0.3) | II (0.45) | III (20) | I (0) | 28 | 2122 | 48.5 | | 6 | II (0.3) | III (0.50) | I (10) | II (5) | 14 | 2053 | 58.8 | | 7 | III (0.32) | I (0.4) | III (20) | II (5) | 25 | 1974 | 60.6 | | 8 | III (0.32) | II (0.45) | I (10) | III (10) | 20 | 2032 | 48.8 | | 9 | III (0.32) | III (0.50) | II (15) | I (0) | 28 | 2105 | 50.5 |
| | Slump (cm) | I | 68 | 65 | 60 | 82 | Primary and secondary factors affecting slump: DACB optimum mix ratio: A3B2C3D1 | | II | 56 | 71 | 65 | 62 | | III | 73 | 61 | 72 | 53 | | R | 17 | 10 | 12 | 29 |
| | Density (kg/m3) | I | 6120 | 6029 | 6145 | 6287 | Primary and secondary factors affecting density: DBCA optimum mix ratio: A3B1C3D3 | | II | 6170 | 6214 | 6160 | 6087 | | III | 6111 | 6168 | 6096 | 6028 | | R | 59 | 185 | 64 | 259 |
| | Compressive strength (MPa) | I | 181.8 | 173.6 | 166.1 | 159.5 | Primary and secondary factors affecting compressive strength: ADBC optimum mix ratio: A1B3C1D2 | | II | 161.8 | 156.8 | 164.5 | 178.9 | | III | 159.9 | 173.1 | 172.9 | 167.1 | | R | 21.9 | 16.8 | 8.4 | 19.4 |
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