1 Introduction
2 Experimental Program
2.1 Test Specimens and Variables
Specimen | Wall thickness (mm) | Specimen condition | Amount of moisture | ||
---|---|---|---|---|---|
Preheated | Non-preheated | kg | % | ||
W15 | 150 | No | – | 42 | 7 |
W15V | 150 | – | Yes | 32 | 5 |
W20 | 200 | No | – | 47 | 7 |
W20V | 200 | – | Yes | 37 | 6 |
W25 | 250 | No | – | 52 | 7 |
W25V | 250 | – | Yes | 42 | 6 |
2.2 Materials
Specified concrete strength (MPa) | W/C (%) | Cement (kg/m3) | Water (kg/m3) | Sands (kg/m3) | Gravels (kg/m3) | Admixture (%) |
---|---|---|---|---|---|---|
24 | 52 | 312 | 162 | 846 | 934 | 1.68 |
2.3 Test Set-up and Data Measurement
3 Results and Discussion
3.1 Experimental Results
3.1.1 Wall Specimens Having Various Thicknesses
Specimen | Temperature at points (°C) | ||
---|---|---|---|
C1 | C2 | C3 | |
W15 | 644.0 | 217.2 | 106.3 |
W15V | 578.0 | 254.4 | 113.9 |
W20 | 723.2 | 87.0 | 60.4 |
W20V | 678.2 | 141.2 | 119.5 |
W25 | 764.1 | 105.5 | 43.4 |
W25V | 694.7 | 119.5 | 104.6 |
Specimen | Increasing time to reach at various temperature level (min) | ||||||
---|---|---|---|---|---|---|---|
100 °C | 200 °C | 300 °C | 400 °C | 500 °C | 600 °C | 700 °C | |
W15 | 9.0 | 13.7 | 10.1 | 13.0 | 18.7 | 27.0 | – |
W20 | 6.8 | 10.2 | 8.3 | 10.0 | 15.0 | 23.3 | 35.9 |
W25 | 6.3 | 9.5 | 7.0 | 9.2 | 13.6 | 19.5 | 28.7 |