Research Article
Experimental Research on High Temperature Resistance of Modified Lightweight Concrete after Exposure to Elevated Temperatures
Table 4
Appearance and spalling statistics of the concrete specimens after exposure to elevated temperatures.
| Mix | Temperatures: °C | Appearance | Spalling statistics | Colors | Cracks | Spalling | : % |
| NC | 20 | Slight gray | — | — | 66.7 | 400 | Slight red | Scarce and local | Slight | 600 | Dark red | A small amount of fine cracks | Medium | 800 | Cinereous | Long and wide | Medium | 1000 | Straw white | A large amount of long cracks | Heavy | 1200 | Slight yellow | Numerous and random | Heavy |
| LWAC | 20 | Dark gray | — | — | 100 | 400 | Dark red | Local microcracks | Slight | 600 | Slight red | A certain amount of fine cracks | Medium | 800 | Straw white | Long and wide | Medium | 1000 | Slight yellow | A large amount of long cracks | Heavy | 1200 | Soil yellow | Numerous and random | Heavy |
| PLWAC | 20 | Dark gray | — | — | 25 | 400 | Dark red | Scarce and local | — | 600 | Slight red | Few small shallow cracks | Slight | 800 | Straw white | A certain amount of fine cracks | Slight | 1000 | Slight yellow | Long and wide cracks at edges | Medium | 1200 | Soil yellow | Large amount and located at edges | Medium |
| GLWAC | 20 | Dark gray | — | — | 16.7 | 400 | Dark red | Unclear | — | 600 | Slight red | Scarce and local | Slight | 800 | Straw white | A small amount of fine cracks | Slight | 1000 | Soil yellow | Long and wide cracks at edges | Medium | 1200 | Brownish Yellow | Large amount and located at edges | Medium |
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represents the percentage of the specimens spalled when the target temperature was above 400°C.
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