Effect of Moisture on the Fire Endurance of Building Elements

Harmathy, T. Z.

doi:10.1520/stp48429s

Cited by 91 publications

(65 citation statements)

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“…Methods exist, however, to take into account the influence of moisture on thermal fire resistance. 6 It should be noted that mechanical effects such as shrinkage or expansion and spalling can also have a significant influence on the fire performance of concrete. The effects of these have not been considered in this paper.…”

Section: Discussion Of Calculated and Experimental Resultsmentioning

confidence: 99%

Factors affecting temperature of fire‐exposed concrete slabs

Lie

Williams-Leir

1979

Fire and Materials

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Fire and Materials, 3, 2, pp. 74-79, 1979-06 Factors affecting temperature of fire-exposed concrete slabs Lie, T. T.; Williams-Leir, G. OTTAWA LvI.ZC 18000Les auteurs examinent l'influence des divers facteurs qui determinent la temp6rature des dalles de b6ton expos6es au feu. Les auteurs ont effectu6 des 6tudes th6oriques et exp&rimentales, 2 partir descquelles ils obtiennent des tableaux de propri6tGs thermiques qui representent bien les propri6t6s des be'tons siliceux et qui se ~retellt aux cafcds de rgsistance au feu. The influence of the various factors that determine temperatures in fire-exposed concrete slabs is examined, in particular that of material properties. Both experimental and theoretical studies have been carried out. From these a set of thermal properties has been derived that is representative of the properties of siliceous concrete and suitable for use in fire resistance calculations.

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Section: Discussion Of Calculated and Experimental Resultsmentioning

confidence: 99%

Factors affecting temperature of fire‐exposed concrete slabs

Lie

Williams-Leir

1979

Fire and Materials

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“…The second is thermo-hydric and considers that the pores water vapour pressures developed when the structure is exposed to a heating are responsible for the thermal instability of the concrete [3]. Spalling is certainly caused by the combination of the two mechanisms in varying proportions, depending on the situation.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, changes in internal stresses, temperature gradients, vapour and liquid transport upon heating, depend on the geometry and affect concrete spalling [1][2][3]. When assessing the spalling risk of a concrete structure, testing elements with geometry and mechanical boundary conditions as close as possible to the real structural layout, is then necessary.…”

Section: Introductionmentioning

confidence: 99%

Spalling tests on embedded cores and slabs: A comparative study

Pimienta

Moreau²,

Avenel

et al. 2013

MATEC Web of Conferences

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Abstract.A comparative analysis of the spalling of (a) cores made of 3 concrete mixes embedded into 3 slabs made of the 3 same concrete mixes; and (b) 3 reference slabs made again of the same 3 concrete mixes has been made. Samples have been exposed to the French Increased HydroCarbon temperature curve. Results confirm that concrete spalling phenomena is not only related to the material properties. Concrete spalling is also very much influenced by the geometry of the samples.

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“…This is attributed to the differing and non-linear behavior of the material phases of concrete (i.e., cement paste and aggregate). Regarding the transport behavior of concrete, numerous fire experiments have demonstrated the role of transport processes such as the advection of water vapor regarding the spalling behavior of concrete at elevated temperatures (see, e.g., [2,6]). Since dense concrete mixes with low permeability proved to be more prone to spalling, parameters related to the pore structure of concrete (such as the permeability) were identified as key parameters determining the durability of concrete structures in case of fire loading.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Transport Properties of Concrete at High Temperatures

Galek

Moser

Ring

et al. 2010

AMM

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When concrete structures are subjected to fire loading, temperature-dependent degradation of the material properties as well as spalling of near-surface concrete layers has a considerable effect on the load-carrying capacity and, hence, the safety of these structures. Spalling is caused by interacting thermo-hydro-chemo-mechanical processes with both mechanical and transport properties playing an important role. Within experimental research activities at the IMWS, these properties are subject of investigation, i.e., (i) the strain behavior of concrete under combined thermal and mechanical loading and (ii) the permeability increase of temperature-loaded concrete and cement paste.

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Effect of Moisture on the Fire Endurance of Building Elements

Abstract: /npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at

Cited by 91 publications

References 1 publication

Factors affecting temperature of fire‐exposed concrete slabs

Factors affecting temperature of fire‐exposed concrete slabs

Spalling tests on embedded cores and slabs: A comparative study

Mechanical and Transport Properties of Concrete at High Temperatures

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