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Form of orthogonal experiment.
| Test group numbers influence factors | Types of asphalt | Saline concentrations | Soaking durations |
|---|---|---|---|
| 1 | 1 | 1 | 1 |
| 2 | 1 | 2 | 2 |
| 3 | 1 | 3 | 3 |
| 4 | 1 | 4 | 4 |
| 5 | 1 | 1 | 4 |
| 6 | 1 | 2 | 1 |
| 7 | 1 | 3 | 2 |
| 8 | 1 | 4 | 3 |
| 9 | 2 | 1 | 3 |
| 10 | 2 | 2 | 4 |
| 11 | 2 | 3 | 1 |
| 12 | 2 | 4 | 2 |
| 13 | 2 | 1 | 2 |
| 14 | 2 | 2 | 3 |
| 15 | 2 | 3 | 4 |
| 16 | 2 | 4 | 1 |
Types of asphalt ((1) conventional bitumen (no. 70 in China), (2) SBS modified asphalt); saline concentrations ((1) 0.3%, (2) 1%, (3) 3%, and (4) 5%); soaking durations ((1) 1 d, (2) 7 d, (3) 15 d, and (4) 30 d).
