Table 3 The duration required for natural drying of samples.
Treatment group | Avg. drying time (h) | Crust thickness (mm) |
|---|---|---|
Untreated sand | 2.1 ± 0.3 | 0 |
1B + 1 C | 3.8 ± 0.5 | 9.8 |
2B + 2 C | 4.4 ± 0.6 | 10 |
4B + 4 C | 5.8 ± 0.7 | 13 |
6B + 6 C | 6.7 ± 0.7 | 18 |
8B + 8 C | 7.2 ± 0.9 | 21.02 |