Research Article
Toughness Calculation of Postfire Normal Concrete
Table 1
The experimental results of fracture parameters.
| Specimen | Temperature | /kN | /kN | /mm | /mm | GPa | N/m | MPa·m1/2 | MPa·m1/2 | MPa·m1/2 | MPa·m1/2 |
| WS6 |
65°C | 6.98 | 11.31 | 0.195 | 0.078 | 21.73 | 425.91 | 0.550 | 1.007 | 1.594 | 1.557 | WS7 | 3.88 | 8.23 | 0.163 | 0.100 | 24.79 | 482.62 | 0.303 | 1.63 | 1.664 | 1.933 | WS8 | 6.88 | 10.41 | 0.212 | 0.087 | 19.43 | 487.75 | 0.557 | 1.006 | 1.518 | 1.563 | WS9 | 7.94 | 10.71 | 0.164 | 0.087 | 23.25 | 480.51 | 0.511 | 1.174 | 1.685 | 1.685 | WS10 | 6.32 | 11.67 | 0.229 | 0.086 | 16.60 | 522.36 | 0.562 | 0.903 | 1.507 | 1.465 |
| Average | | 6.42 | 10.47 | 0.193 | 0.088 | 21.16 | 479.83 | 0.480 | 1.161 | 1.594 | 1.641 |
| WS16 |
200°C | — | — | — | — | — | — | — | — | — | — | WS17 | 4.22 | 6.60 | 0.317 | 0.143 | 11.58 | 282.51 | 0.211 | 0.803 | 1.206 | 1.014 | WS18 | 3.97 | 6.15 | 0.213 | 0.138 | 6.98 | 215.14 | 0.353 | 0.485 | 0.863 | 0.838 | WS19 | 2.41 | 5.33 | 0.213 | 0.138 | 9.17 | 235.91 | 0.215 | 0.72 | 0.924 | 0.935 | WS20 | 3.32 | 5.24 | 0.458 | 0.211 | 7.00 | 368.94 | 0.245 | 0.796 | 1.022 | 1.041 |
| Average | | 3.50 | 5.72 | 0.352 | 0.157 | 8.68 | 376.95 | 0.256 | 0.688 | 1.044 | 0.957 |
| WS31 |
400°C | 1.55 | 3.61 | 1.032 | 0.492 | 2.56 | 532.09 | 0.138 | 0.572 | 0.795 | 0.710 | WS32 | 1.78 | 3.19 | 1.218 | 0.548 | 1.42 | 396.93 | 0.158 | 0.333 | 0.574 | 0.491 | WS33 | 2.37 | 3.27 | 0.768 | 0.299 | 2.12 | 434.89 | 0.174 | 0.236 | 0.621 | 0.410 | WS34 | 2.36 | 4.53 | 0.736 | 0.302 | 1.71 | 598.93 | 0.125 | 0.356 | 0.468 | 0.494 | WS35 | — | — | — | — | — | — | — | — | — | — |
| Average | | 2.01 | 3.78 | 0.901 | 0.410 | 1.95 | 490.71 | 0.152 | 0.374 | 0.615 | 0.526 |
| WS46 |
600°C | 0.76 | 1.13 | 1.482 | 0.684 | 0.47 | 228.23 | 0.067 | 0.174 | 0.221 | 0.231 | WS47 | 0.53 | 1.48 | 2.082 | 0.684 | 0.48 | 395.06 | 0.063 | 0.209 | 0.277 | 0.284 | WS48 | 0.81 | 1.65 | 1.908 | 0.813 | 1.14 | 539.22 | 0.072 | 0.478 | 0.550 | 0.550 | WS49 | 0.58 | 1.14 | 1.687 | 0.973 | 0.38 | 331.99 | 0.052 | 0.188 | 0.225 | 0.225 | WS50 | 0.62 | 1.48 | 2.082 | 0.727 | 0.38 | 273.07 | 0.068 | 0.155 | 0.213 | 0.213 |
| Average | | 0.62 | 1.38 | 1.848 | 0.799 | 0.57 | 353.51 | 0.064 | 0.241 | 0.297 | 0.301 |
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