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Model for the characterisation and design of Passive Fire Protection (PFP) systems for steel structures

Lookup NU author(s): Professor Geoff Gibson, Dr George Kotsikos, Pietro Di Modica, Sandra Christke, Dr Kai Yi, Professor Adrian Mouritz, Dr Everson Kandare

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Abstract

© 2016, European Conference on Composite Materials, ECCM. All rights reserved. This paper describes the use of a small-scale constant heat flux propane burner test to characterise PFP systems. Three such systems were investigated, each working on a slightly different principle. These were: (i) a refractory ceramic wool, (ii) a phenolic resin 'composite' containing porous ceramic prills, and (iii) a composite intumescent system. In each case the heat transferred through the PFP was measured by attaching it to a 10 mm thick steel substrate and measuring the temperature rise. In the present study the steel rear face was open to the atmosphere. It was found that, despite the different operating mechanisms of the three PFP systems, all showed similar substrate temperature-time profiles. This was characterised by an initial thermal lag followed by a period of near-constant heat flux, with a near-linear temperature rise. It was found that the transmission of heat through each PFP could be modelled well by considering only the initial thermal lag due to thermal diffusivity (along with initial decomposition in cases (ii) and (ii), followed by a near steady-state period involving only heat conduction through an established refractory layer. The solution involved coupling analytical expressions for the unsteady behaviour at the start of the test, followed by a 'lumped parameter' treatment of the later stages. The solution involves just two material parameters: an effective thermal diffusivity for the PFP near to the start of the fire exposure, along with an effective thermal conductivity relating to the PFP in its later stages. The approach leads to a simple design equation that can be used to characterise and design fire protection materials when using the well-known 'HP/A' procedure. Allowance can also be made for the effect of heat losses at the rear of the steel substrate.


Publication metadata

Author(s): Gibson AG, Jusoh WW, Kotsikos G, Di Modica P, Christke S, Yi K, Mouritz AP, Kandare E

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: ECCM 17: 17th European Conference on Composite Materials

Year of Conference: 2016

Acceptance date: 02/04/2016

Publisher: European Conference on Composite Materials, ECCM

URL: http://www.eccm17.org/

Library holdings: Search Newcastle University Library for this item

ISBN: 9783000533877


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