Research Article
Crack Extension Resistance of Normal-Strength Concrete Subjected to Elevated Temperatures
Table 1
Experimental results of fracture parameters.
| Specimen | Temperature | (kN) | CMODini (mm) | (kN) | (mm) | (mm) | (GPa) | (h) | (MPa·m1/2) | (MPa·m1/2) | (N/m) |
| WS1 |
20°C | 6.19 | 0.068 | 8.33 | 0.174 | 0.065 | 15.30 | 0.53 | 0.505 | 1.061 | 234.15 | WS2 | 6.28 | 0.047 | 9.81 | 0.120 | 0.039 | 20.51 | 0.48 | 0.523 | 1.070 | 483.66 | WS3 | 7.26 | 0.063 | 10.40 | 0.210 | 0.079 | 20.66 | 0.57 | 0.610 | 1.497 | 438.22 | WS4 | 7.02 | 0.086 | 7.92 | 0.152 | 0.060 | 18.88 | 0.56 | 0.357 | 1.091 | 219.39 | WS5 | 5.65 | 0.060 | 9.39 | 0.237 | 0.096 | 15.45 | 0.54 | 0.503 | 1.213 | 321.05 | Average | 6.55 | 0.065 | 9.17 | 0.178 | 0.068 | 18.16 | 0.54 | 0.498 | 1.186 | 339.30 |
| WS6 |
65°C | 6.98 | 0.055 | 11.31 | 0.195 | 0.078 | 21.73 | 0.56 | 0.550 | 1.594 | 425.91 | WS7 | 3.88 | 0.050 | 8.23 | 0.163 | 0.100 | 24.79 | 0.66 | 0.303 | 1.664 | 482.62 | WS8 | 6.88 | 0.078 | 10.41 | 0.212 | 0.087 | 19.43 | 0.57 | 0.557 | 1.518 | 487.75 | WS9 | 7.94 | 0.052 | 10.71 | 0.164 | 0.087 | 23.25 | 0.60 | 0.511 | 1.685 | 480.51 | WS10 | 6.32 | 0.056 | 11.67 | 0.229 | 0.086 | 16.60 | 0.54 | 0.562 | 1.507 | 522.36 | Average | 6.42 | 0.058 | 10.47 | 0.193 | 0.088 | 21.16 | 0.59 | 0.480 | 1.594 | 479.83 |
| WS11 |
120°C | 5.03 | 0.064 | 8.37 | 0.191 | 0.056 | 10.65 | 0.47 | 0.518 | 0.900 | 396.52 | WS13 | 4.69 | 0.093 | 8.25 | 0.224 | 0.084 | 11.87 | 0.53 | 0.417 | 1.058 | 517.82 | WS12 | 4.71 | 0.070 | 7.53 | 0.357 | 0.152 | 9.48 | 0.60 | 0.419 | 1.202 | 654.73 | WS14 | 2.79 | 0.030 | 7.53 | 0.198 | 0.083 | 15.42 | 0.58 | 0.249 | 1.107 | 345.46 | WS15 | — | — | — | — | — | — | — | — | — | — | Average | 4.31 | 0.064 | 7.92 | 0.243 | 0.094 | 11.86 | 0.55 | 0.401 | 1.067 | 478.63 |
| WS21 |
300°C | 1.89 | 0.182 | 3.40 | 0.653 | 0.283 | 2.45 | 0.61 | 0.168 | 0.556 | 437.92 | WS22 | 3.48 | 0.185 | 5.53 | 0.667 | 0.280 | 3.49 | 0.59 | 0.309 | 0.841 | 611.47 | WS23 | 1.82 | 0.121 | 3.38 | 0.672 | 0.271 | 1.91 | 0.57 | 0.162 | 0.480 | 341.77 | WS24 | 2.61 | 0.194 | 4.97 | 0.577 | 0.262 | 1.99 | 0.52 | 0.232 | 0.589 | 564.12 | WS25 | 2.03 | 0.096 | 4.17 | 0.651 | 0.361 | 4.03 | 0.68 | 0.175 | 0.913 | 549.99 | Average | 2.37 | 0.156 | 4.29 | 0.644 | 0.291 | 2.78 | 0.59 | 0.209 | 0.676 | 501.05 |
| WS36 |
450°C | 1.52 | 0.126 | 3.37 | 1.009 | 0.544 | 1.41 | 0.62 | 0.135 | 0.582 | 611.53 | WS37 | — | — | — | — | — | — | — | — | — | — | WS38 | 1.52 | 0.163 | 3.26 | 1.419 | 0.660 | 1.46 | 0.62 | 0.135 | 0.527 | 482.45 | WS39 | 1.12 | 0.296 | 3.07 | 1.348 | 0.617 | 1.34 | 0.64 | 0.100 | 0.563 | 663.10 | WS40 | 0.99 | 0.105 | 2.94 | 1.394 | 0.666 | 1.58 | 0.68 | 0.088 | 0.659 | 678.79 | Average | 1.29 | 0.172 | 3.16 | 1.293 | 0.622 | 1.48 | 0.64 | 0.115 | 0.583 | 608.97 |
| WS46 |
600°C | 0.76 | 0.443 | 1.13 | 1.482 | 0.684 | 0.47 | 0.65 | 0.067 | 0.221 | 228.23 | WS47 | 0.53 | 0.139 | 1.48 | 2.082 | 0.684 | 0.48 | 0.64 | 0.063 | 0.277 | 395.06 | WS48 | 0.81 | 0.324 | 1.65 | 1.908 | 0.813 | 1.14 | 0.76 | 0.072 | 0.550 | 539.22 | WS49 | 0.58 | 0.436 | 1.14 | 1.687 | 0.973 | 0.38 | 0.65 | 0.052 | 0.225 | 331.99 | WS50 | 0.62 | 0.279 | 1.48 | 2.082 | 0.727 | 0.38 | 0.62 | 0.068 | 0.213 | 273.07 | Average | 0.62 | 0.324 | 1.38 | 1.848 | 0.799 | 0.57 | 0.67 | 0.064 | 0.297 | 353.51 |
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