Concrete Fire Testing - A Review of the Thermal Boundary Conditions

Cristian Maluk

doi:10.4028/www.scientific.net/KEM.711.496

Paper Titles

Combined Effects on Residual Strength of a High Performance Concrete Exposed to Fire
p.465

Effects of Mix Proportion on the Strength and Elasticity of Concrete Subjected to High Temperatures up to 800C
p.472

Fibre Cocktail to Improve Fire Resistance
p.480

Mechanical Properties and Damage Evolution of Siliceous Concrete Subjected to Elevated Temperatures
p.488

Concrete Fire Testing - A Review of the Thermal Boundary Conditions
p.496

Mechanical Properties of Oven-Dried Mortar Exposed to High Temperature Considering Different Raw Material
p.504

Crack Growth Resistance in Fibre Reinforced Geopolymer Concrete Exposed to Sustained Extreme Temperatures
p.511

Effects of Exposure Term on the Strength and Elasticity of Concrete Subjected to Elevated Temperature up to 175°C
p.519

Load Induced Thermal Strains in Steel Fibre Reinforced Concrete Subjected to Uniaxial Compression
p.525

HomeKey Engineering MaterialsKey Engineering Materials Vol. 711Concrete Fire Testing - A Review of the Thermal...

Concrete Fire Testing - A Review of the Thermal Boundary Conditions

Abstract:

Experimental studies of concrete in fire or at elevated temperature have traditionally given relatively little scientific attention to quantifying the severity, and to some extent reproducibility, of the thermal boundary conditions imposed on specimens during testing. This paper examines the heat transfer fundamentals of fire testing when controlling the time-history of temperature inside a furnace (or oven), versus controlling the time-history of incident radiant heat flux at a specimen’s exposed surface. The thermal boundary conditions of a concrete specimen during fire testing are fundamentally based on conservation of energy, and thus typically formulated in terms of heat fluxes. While from the standpoint of concrete fire behaviour the aim is typically only to gauge the distribution of temperatures inside concrete; this is rarely explicitly acknowledged or quantified during concrete fire testing. This shows that continued unexamined use of varied heating techniques presents a serious threat to harmonization of the thermal boundary conditions imposed during concrete testing. The current work proposes adopting test control by in-depth temperature distributions or net heat fluxes for a rigorous comparison of the thermal boundary conditions imposed on test specimens when using different heating techniques.

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Periodical:

Key Engineering Materials (Volume 711)

Pages:

496-503

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.711.496

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Online since:

September 2016

Authors:

Cristian Maluk*

Keywords:

Concrete, Fire Testing, Furnace, Heat Flux, H-TRIS, Thermal Boundary Conditions

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References

[1] Law M. (1981). Designing Fire Safety for Steel – Recent Work. Proceedings of the ASCE Spring Convention, American Society of Civil Engineers, New York, 16 pp.