Table 5.
Experimental results of the direct tensile strength before and after fire tests.
| ID |
(MPa) (Before Test) |
(GPa) | Toughness (kJ/m3) |
(MPa) (After Test) | ||
|---|---|---|---|---|---|---|
| 1 h | 2 h | 3 h | ||||
| 100 | 13.41 (0.076) | 34.97 (0.179) | 401.9 (0.114) | - | - | - |
| 140 | 15.53 (0.013) | 39.41 (0.306) | 442.5 (0.134) | - | - | - |
| 180 | 18.78 (0.050) | 44.61 (0.201) | 730.3 (0.221) | - | - | - |
| 100-PP0.2 | 11.79 (0.113) | 28.61 (0.214) | 345.2 (0.055) | 1.01 (0.305) | 0.993 (0.362) | 0.35 (0.044) |
| 100-PP0.4 | 12.40 (0.083) | 31.03 (0.174) | 341.6 (0.138) | 1.65 (0.201) | 1.34 (0.081) | 0.88 (0.568) |
| 100-PP0.6 | 12.72 (0.056) | 33.36 (0.207) | 343.1 (0.041) | 1.60 (0.163) | 1.27 (0.151) | 0.80 (0.421) |
| 100-PN0.2 | 12.73 (0.142) | 32.01 (0.196) | 317.5 (0.142) | 1.88 (0.170) | 1.95 (0.168) | - |
| 100-PN0.4 | 12.27 (0.123) | 31.25 (0.167) | 325.6 (0.149) | 1.52 (0.192) | 1.41 (0.200) | 0.67 (0.067) |
| 100-PN0.6 | 12.79 (0.079) | 32.79 (0.341) | 384.8 (0.098) | 1.66 (0.282) | 1.75 (0.072) | 1.44 (0.093) |
| 140-PP0.2 | 13.74 (0.065) | 36.76 (0.508) | 331.5 (0.166) | 2.71 (0.268) | 1.99 (0.290) | 2.18 (0.184) |
| 140-PP0.4 | 13.83 (0.127) | 37.17 (0.272) | 342.8 (0.155) | 2.15 (0.263) | 1.52 (0.069) | 1.81 (0.676) |
| 140-PP0.6 | 13.37 (0.030) | 36.38 (0.296) | 340.0 (0.073) | 3.20 (0.243) | 1.48 (0.191) | 2.23 (0.207) |
| 140-PN0.2 | 13.18 (0.113) | 35.79 (0.404) | 360.5 (0.114) | 2.27 (0.316) | 1.78 (0.456) | 1.61 (0.543) |
| 140-PN0.4 | 12.73 (0.127) | 38.99 (0.391) | 430.9 (0.028) | 2.25 (0.452) | 1.86 (0.108) | 1.90 (0.316) |
| 140-PN0.6 | 13.14 (0.049) | 38.60 (0.296) | 375.9 (0.090) | 2.02 (0.483) | 1.58 (0.368) | 2.25 (0.031) |
| 180-PP0.2 | 15.73 (0.065) | 42.48 (0.355) | 447.2 (0.221) | - | - | - |
| 180-PP0.4 | 16.66 (0.092) | 40.24 (0.427) | 527.3 (0.230) | - | - | - |
| 180-PP0.6 | 17.29 (0.096) | 43.77 (0.430) | 584.4 (0.148) | 4.37 (0.082) | 2.33 (0.186) | 2.35 (0.255) |
| 180-PN0.2 | 16.33 (0.039) | 41.35 (0.272) | 528.5 (0.116) | - | - | - |
| 180-PN0.4 | 15.48 (0.036) | 42.62 (0.271) | 522.1 (0.226) | 3.98 (0.068) | 2.38 (0.177) | 2.19 (0.237) |
| 180-PN0.6 | 16.72 (0.094) | 42.60 (0.421) | 549.0 (0.234) | 3.87 (0.104) | 2.85 (0.171) | 2.35 (0.296) |
Values in parentheses ( ) mean a Coefficient of variation (CoV).