| 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 |
|