Sample 1 | Sample 2 | Sample 3 | Sample 4 | ||||
class of loading/kN | crack width/mm | class of loading/kN | crack width/mm | class of loading/kN | crack width/mm | class of loading/kN | crack width/mm |
20 | 0.02 | 20 | 0.10 | 20 | 0.04 | 20 | 0.04 |
30 | 0.06 | 30 | 0.10 | 30 | 0.06 | 30 | 0.09 |
40 | 0.10 | 40 | 0.10 | 40 | 0.10 | 40 | 0.15 |
50 | 0.15 | 50 | 0.10 | 50 | 0.15 | 50 | 0.15 |
60 | 0.15 | 60 | 0.40 | 60 | 0.18 | 60 | 0.17 |
70 | 0.20 | 65 | 1.30 | 68 | 1.4 | 70 | 0.85 |
80 | 0.90 | - | - | - | - | - | - |
84 | 1.30 | - | - | - | - | - | - |