Spalling of full-scale high strength concrete wall panels with difference aggregate sizes
This paper presents the fire test results of high strength concrete full-scale wall panels. The effect of aggregate size and pore pressures will be discussed. The course aggregate sizes varied from 7 mm, 14 mm to 20 mm. Two types of aggregates were tested, namely, granite and basalt. Hydrocarbon fir...
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| Format: | Conference or Workshop Item |
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| Online Access: | http://eprints.uthm.edu.my/2816/ http://eprints.uthm.edu.my/2816/1/AHMAD_ZURISMAN_FULL_PAPER.pdf |
| Summary: | This paper presents the fire test results of high strength concrete full-scale wall panels. The effect of aggregate size and pore pressures will be discussed. The course aggregate sizes varied from 7 mm, 14 mm to 20 mm. Two types of aggregates were tested, namely, granite and basalt. Hydrocarbon fire temperature versus time in accordance to EN1991-1-2 was used for exposing the specimens. Thermal diffusivities for these specimens were calculated from the thermal-couple data by using the Finite Difference back calculation method. The spalling was measured by weight loss before and after firing, and ranged from 7.5% to 32.5%. The thermal diffusivity graph shows that water changed into steam at temperatures ranging from 110oC to 155oC. This corresponds to pressures induced by the steam ranging from 0.042 MPa and 0.442 MPa. This is significantly less than the tensile strength of concrete, which is estimated to be about 3 MPa. Therefore, the pore pressure from steam in the concrete is only one of the factors that influence the spalling of concrete. |
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