Sample 1 | Sample 2 | Sample 3 | Sample 4 | ||||
class of loading/kN | average height/cm | class of loading/kN | average height/cm | class of loading/kN | average height/cm | class of loading/kN | average height/cm |
20 | 7.50 | 20 | 8.57 | 20 | 11.62 | 20 | 11.88 |
30 | 11.94 | 30 | 12.67 | 30 | 14.57 | 30 | 14.31 |
40 | 13.81 | 40 | 13.13 | 40 | 15.14 | 40 | 15.15 |
50 | 15.31 | 50 | 13.75 | 50 | 15.29 | 50 | 16.00 |
60 | 15.75 | 60 | 16.13 | 60 | 15.43 | 60 | 16.00 |
70 | 16.50 | 65 | 18.00 | 68 | 16.36 | 70 | 17.15 |
80 | 16.81 | - | - | - | - | - | - |
84 | 20.13 | - | - | - | - | - | - |