Permeability measurement on high strength concrete without and with polypropylene fibers at elevated temperatures using a new test setup

Bošnjak, Josipa; Ožbolt, Joško; Hahn, Rolf

doi:10.1016/j.cemconres.2013.06.005

Cited by 121 publications

(52 citation statements)

References 14 publications

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“…In the case of the addition of polypropylene fibers, the ability to reduce cracking is due to fact that concrete permeability increases suddenly between 80°C and 130°C, and polypropylene, once it has reached the melting point, flows through the cracks and produces channels allowing the water vapor and gases to be evacuated releasing the pore pressure [20][21][22][23][24][25][26][27][28]. Although there are numerous research works on the behavior of concrete elements to fire, no literature has been found about concrete elements subjected to compression in the range of temperatures studied in the present work, neither when subjected to a direct fire test, nor comparisons performance to fire of concrete with steel and polypropylene fibers.…”

Section: Introductionmentioning

confidence: 99%

Analysis of fire resistance of concrete with polypropylene or steel fibers

Serrano

Escamilla

Barrio

et al. 2016

Construction and Building Materials

131

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a b s t r a c tThe decrease in concrete resistance and the expansion generated in reinforced concrete structures by direct exposure to fire at 400°C maximum temperature serves as the basis for the present research. The aim is to improve these problems by the addition of steel fibers or of polypropylene fibers in concrete.From the results analysis of compression fracture tests on cylindrical concrete specimens, it can be concluded that concrete with addition of polypropylene fibers or steel fibers are a good alternative to traditional concrete, because both its strength, and its behavior in case of fire are improved, delaying the appearance of fissures and explosive concrete spalling.

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Section: Introductionmentioning

confidence: 99%

Analysis of fire resistance of concrete with polypropylene or steel fibers

Serrano

Escamilla

Barrio

et al. 2016

Construction and Building Materials

131

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show abstract

“…The latter ones were usually determined by extensive measurements after fire testing, for example by using a surface scanner [10,11]. Moreover, concrete properties such as strength, density or permeability have been widely used to predict the risk of spalling (e.g., [9,12]). However, the prediction of spalling is very difficult and imprecise [13].…”

Section: Introductionmentioning

confidence: 99%

The effect of various fire‐exposed surface dimensions on the spalling of concrete specimens

Werner

Rogge

2014

Fire and Materials

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SUMMARYConcrete spalling due to fire exposure is often defined as the sudden detachment of fragments from a concrete surface. It can be quantified by various parameters of which weight loss and spalling depth are the most common ones. The risk of spalling is influenced by many factors such as concrete composition, heating rate and applied testing methods. A reduced scale testing method should be developed to analyse the spalling behaviour and to understand its effectiveness in more detail. As a subsection of this development, this study aimed to analyse the effect of different-sized, circular heated areas in semi full-scale fire tests. Therefore, vermiculite slabs with varying cut-outs in their centre were placed between a specimen made of a spalling-sensitive concrete and the combustion chamber. The combustion chamber was heated following a standard fire curve. Our experimental results show that the thermal expansion inside of equal-sized specimens is strongly dependent on the size of the heated area. In addition, this area also affects thermal stresses. They decrease as a result of lower temperature gradients for tests with smaller unheated boundary areas. Apart from this, the analysis of fragments shows no correlation between their relative volume distribution and the heated area.

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“…And the melted polypropylene is helpful for pressure relief. Thus, the addition of polypropylene fiber is beneficial to improve the heat resistance of concrete and prevent explosive spalling of concrete (Bošnjak, Ožbolt, & Hahn, 2013;Kalifa, Chene, & Galle, 2001). Good thermal conductivity of graphite aggregate reduced thermal stress, which is also one of the reasons that G10F and G20F exhibited good heat-resistance properties.…”

Section: Properties Testmentioning

confidence: 99%

Preparation and Properties of Alkali-Activated Ground-Granulated Blast Furnace Slag Thermal Storage Concrete

Lü¹,

Ping²,

He³

et al. 2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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Thermal storage concrete is prepared by using alkali-activated ground-granulated blast furnace slag as cementitious material. To improve thermal conductivity, graphite aggregate is used to replace part of the coarse aggregate, and, furthermore, polypropylene fiber is added to improve the heat resistance performance of the concrete. The compressive strength of concrete specimens before and after heating (up to 450 °C) was tested, and, furthermore, scanning electron microscopy was used to investigate the structure alteration due to heating. Results showed that the partial replacement of coarse aggregate by graphite block could obviously improve the thermal conductivity of the thermal storage concrete. At the same time, the specimen with 30% graphite aggregate replacement still exhibited good mechanical properties. The mechanism of the high residual strength was investigated.

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Permeability measurement on high strength concrete without and with polypropylene fibers at elevated temperatures using a new test setup

Cited by 121 publications

References 14 publications

Analysis of fire resistance of concrete with polypropylene or steel fibers

Analysis of fire resistance of concrete with polypropylene or steel fibers

The effect of various fire‐exposed surface dimensions on the spalling of concrete specimens

Preparation and Properties of Alkali-Activated Ground-Granulated Blast Furnace Slag Thermal Storage Concrete

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