| Substitution rate of pozzolan | Flexural strengh (Mpa) | ||||||||
| 7 days | 28 days | 90 days | |||||||
| PCB | PCC | PCN | PCB | PCC | PCN | PCB | PCC | PCN | |
| 0 | 8.8 | 8.8 | 8.8 | 10.08 | 10.08 | 10.08 | 10.98 | 10.98 | 10.98 |
| 10 | 7.58 | 8.6 | 7.1 | 8.98 | 9.56 | 8.55 | 9.25 | 10.01 | 8.9 |
| 15 | 7.01 | 8.1 | 6.7 | 8.02 | 9.22 | 7.91 | 9.02 | 9.99 | 8.2 |
| 25 | 6.5 | 7.41 | 6.3 | 7.38 | 8.64 | 7.08 | 8.69 | 9.56 | 7.89 |
| 35 | 6.01 | 6.9 | 6.1 | 7.09 | 8.32 | 6.96 | 8.12 | 9.09 | 7.11 |