Aggregates | Compressive strength | |||
7 days | 21 days | 28 days | ||
Natural sand | Average | 12.37 | 14.79 | 16.51 |
IC (95%) | [5.46 - 19.27] | [8.83 - 20.76] | [9.76 - 23.25] | |
Standard deviation | 7.05 | 6.08 | 6.88 | |
Improved sand | Average | 22.88 | 23.79 | 28.32 |
IC (95%) | [21.21 - 24.55] | [22.63 - 24.96] | [27.4 - 29.25] | |
Standard deviation | 1.48 | 1.03 | 0.82 |