Research Article
Testing of Action of Direct Flame on Concrete
Table 4
Description of individual specimens during heating.
| Mixture | Exposure time | Description |
| CEM I - GR-PF | 7 min | First crack formed on the side with thermocouples, where moisture escapes |
| CEM III/B - B-PF | — | With no outstanding changes during heating |
| CEM III/B - B-SF | — | With no outstanding changes during heating |
| CEM III/B - B | — | With no outstanding changes during heating |
| CEM I - GR-SCC | 1 min | Explosive spalling (depth approx. 5 mm) | 2 min | Another explosive spalling | 4 min | Escape of moisture from side walls of the specimen, extensive escape of moisture and water vapor where the second thermocouple is fixed |
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