Spalling of full-scale high strength concrete wall panels with difference aggregate sizes

Mohd Ali, Ahmad Zurisman and Jay Sanjayan, Jay Sanjayan and Maurice Guerrieri, Maurice Guerrieri Spalling of full-scale high strength concrete wall panels with difference aggregate sizes. In: Talent Management Symposium (TMS 2012) , 11-12 July 2012, Australia.

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Abstract

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.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:concrete; full-scale wall panels; spalling; fire; thermal diffusivity
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA630-695 Structural engineering (General)
Divisions:Faculty of Civil and Environmental Engineering > Department of Material and Structure Engineering
ID Code:2816
Deposited By:Normajihan Abd. Rahman
Deposited On:23 Nov 2012 17:34
Last Modified:23 Nov 2012 17:34

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