Behaviour of fiber reinforced concrete columns in fire

Rodrigues, João Paulo C.; Laím, Luís; Correia, António Moura

doi:10.1016/j.compstruct.2009.10.029

Cited by 58 publications

(20 citation statements)

References 6 publications

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“…It is clearly shown by the data that properly adding PP fibers into concrete will not only reduce explosive spalling, which usually occurs with high-strength concrete in fire, but will also contribute to the improvement of the residual flexural strength to a certain extent. As indicated by Rodrigues et al [25] and Zeiml et al [26], PP fibers under fire action would create a network of microchannels for relieving the water vapor; this will, in return, reduce the damage in fire. However, excessive PP fibers will lead to redundant porosity and thus reduce the residual strength of concrete.…”

Section: Resultsmentioning

confidence: 97%

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Flexural properties after exposure to elevated temperatures of a ground granulated blast furnace slag concrete incorporating steel fibers and polypropylene fibers

Gao

Yan

2013

Fire and Materials

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Experiments were carried out to investigate the flexural properties of fiber‐reinforced ground granulated blast furnace slag (GGBFS) concrete after exposure to high temperatures. On the basis of experimental observation, the effect of GGBFS content, the steel fiber dosage, the polypropylene (PP) fiber dosage, and the strength grade on the residual strength of concrete after exposure to elevated temperatures were systematically examined. Test data indicate that exposure to high temperatures causes deterioration in the flexural strength of concrete; inclusion of GGBFS, PP fibers, and steel fibers, all effectively improve the residual flexural strength of concrete after fire. The optimum amounts of GGBFS, PP fibers, and steel fibers are identified respectively for better fire resistance of concrete. The strength losses of concretes characterized by different strength grades are very close to one another. Equations are proposed to predict the residual flexural strength of concrete incorporating GGBFS, PP fibers, and steel fibers after being heated to temperatures up to 800°C. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 97%

“… and Zeiml et al . , PP fibers under fire action would create a network of microchannels for relieving the water vapor; this will, in return, reduce the damage in fire. However, excessive PP fibers will lead to redundant porosity and thus reduce the residual strength of concrete.…”

Section: Resultsmentioning

confidence: 99%

Flexural properties after exposure to elevated temperatures of a ground granulated blast furnace slag concrete incorporating steel fibers and polypropylene fibers

Gao

Yan

2013

Fire and Materials

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“…1 the test layout is illustrated, showing the test set-up for fire resistance tests on columns with restrained thermal elongation. A wide-ranging experimental research has already been carried out in this facility for at least the past four years, namely, on steel (Correia and Rodrigues 2012;Correia et al 2011), concrete (Martins andRodrigues et al 2010) and steel-concrete composite columns (Pires et al 2012;. This system allows testing columns of different materials, cross-sections, slenderness, and varying stiffness of the surrounding structure and load levels.…”

Section: Test Set-upmentioning

confidence: 99%

Fire Behaviour of Circular Concrete Columns with Restrained Thermal Elongation

Rodrigues

Laím

Korzen

2014

ACT

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Most of the previous studies on reinforced concrete columns with elastically restrained thermal elongation were carried out on square, rectangular or '+'-shaped cross sections. The number of fire resistance tests on circular reinforced concrete columns with elastically restrained thermal elongation is still very small. In order to examine the influence of several parameters on the behaviour in fire of this type of columns several fire resistance tests were carried out. The parameters tested were the load and restraint level, slenderness of the column and longitudinal reinforcement ratio. In the fire resistance tests the specimens were exposed to the ISO 834 standard fire curve and the critical time (fire resistance) and temperature and failure modes were determined. The test results showed that the spalling phenomenon may occur in circular columns and so reducing its fire resistance. The increasing of the load level led to a reduction while the increasing of the longitudinal reinforcement ratio or the decreasing of the slenderness of the columns led to an increasing of their fire resistance. The restraint level might not be much relevant on the fire resistance of circular reinforced concrete columns.

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“…micro-fracture resulting from the expansion of the molten fibres [15]), melting of PP fibres is understood to produce new expansion channels and connect existing internal channels within concrete material [16], and consequently the accumulated water vapour can escape and the buildup of pore pressure inside concrete is alleviated, thus reducing the chance of spalling [10,15]. In a combined manner, the PP fibres can mitigate the spalling of concrete while the steel fibres provide high ductility and reduce crack propagation for the concrete [17].…”

Section: Introductionmentioning

confidence: 99%