Testing of Action of Direct Flame on Concrete

Bodnárová, Lenka; Válek, Jaroslav; Novosad, Petr

doi:10.1155/2015/371913

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…However, microcracks are occasionally visible, but they are considerably lesser and smaller in size than the cracks in CBCs with rubber tire fly ash. In earlier reported studies, PET waste inclusion resulted in the deterioration of mechanical properties of concrete [27][28][29][30][31]. However, the performance of concrete with PET waste during ISO 834 exposure showed a comparable response but the temperature during heating was higher for CBC with PET waste than the concrete due to porous network formation [32].…”

Section: Post-fire Compressive Resistancementioning

confidence: 89%

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Study on the Compressive Behaviour of Sustainable Cement-Based Composites under One-Hour of Direct Flame Exposure

2020

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Fire is a significant threat to human life and civil infrastructures. Builders and architects are hankering for safer and sustainable alternatives of concrete that do not compromise with their design intent or fire safety requirements. The aim of the present work is to improve the residual compressive performance of concrete in post-fire exposure by incorporating by-products from urban residues. Based on sustainability and circular economy motivations, the attention is focused on rubber tire fly ash, aged brick powder, and plastic (PET) bottle residuals used as partial sand replacement. The selected by-products from urban residues are used for the preparation of Cement-Based Composites (CBCs) in two different proportions (10% and 15%). Thermal CBC behaviour is thus investigated under realistic fire scenarios (i.e., Direct Flame (DF) for 1 h), by following the International Organization for Standardization (ISO) 834 standard provisions, but necessarily resulting in nonuniform thermal exposure for the cubic specimens. The actual thermal exposure is further explored with a Finite Element (FE) model, giving evidence of thermal boundaries effects. The post-fire residual compressive strength of heated concrete and CBC samples is hence experimentally derived, and compared to unheated specimens in ambient conditions. From the experimental study, the enhanced post-fire performance of CBCs with PET bottle residual is generally found superior to other CBCs or concrete. The structure–property relation is also established, with the support of Scanning Electron Microscopy (SEM) micrographs. Based on existing empirical models of literature for the prediction of the compressive or residual compressive strength of standard concrete, newly developed empirical relations for both concrete and CBCs are assessed.

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Section: Post-fire Compressive Resistancementioning

confidence: 89%

“…In general, the standard ISO 834 thermal history (or a fixed rate of heating) is imposed for different time durations in dedicated furnaces to expose the investigated specimens to elevated temperature [15,29]. In a few cases, the concrete specimens were exposed to real flame [30].…”

Section: Introductionmentioning

confidence: 99%

Study on the Compressive Behaviour of Sustainable Cement-Based Composites under One-Hour of Direct Flame Exposure

2020

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“…When concrete is exposed to high temperatures, two phenomena can cause material loss. Gradual and explosive spalling: Gradual spalling: involves many sequential processes, beginning with aggregate spalling, corner separation, surface fragmentation [8], spalling, and spalling after cooling as shown in Figure 2. Explosive spalling of concrete blocks is characterized by a sudden release of energy, this phenomenon may occur during the first 30 minutes of fire, and is characterized by a large or small piece of concrete violently ejected from the surface accompanied by a loud noise, where explosive spalling of concrete has been observed under fire test conditions.…”

Section: Spallingmentioning

confidence: 99%

“…Concrete is a material that has excellent intrinsic behavior when exposed to fire, it is considered a non-combustible material and has a very high thermal resistance [8], which results in a significant slowdown of heat propagation through the concrete cross-section. In fact, in most fires, only the outer concrete surface layer is damaged, which is about (3 to 5) cm thick, and which allows us to carry out restoration and reinforcement works, that contribute to the reuse of many concrete buildings that have been exposed to fire.…”

Section: Scope Of Workmentioning

confidence: 99%

The Thermal Effects on the Self-Compacting Concrete Beams Exposed to the Fire

TAWASHİ

2023

ECJSE

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Self-Compacting concrete (SCC) is one of the most important technological developments in the construction material. Its use has increased significantly in recent years in the construction industry due to its high properties. though, the performance of fire-affected elements made of SCC mixture is primarily unknown. In this work, beams were produced of (SCC) in laboratory, and exposed to external fire at several reference time (30/60/90/120)min with two methods of cooling (subjectively, water), where three levels of response were selected and evaluated (thermal transferring progress, Spalling, surface microstructure), the results revealed that the damaged in the service loaded beam is interesting, corresponds to the characteristics of the cracks formed in the concrete section on bending zone which was photographically documented, and the progress of thermal transferring has a large values during (5-20) min in heating stage, and takes varies values (10-30%) at beam height where the curve been closer to linear.

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“…In general, the standard ISO 834 thermal history (or a fixed rate of heating) is in fact imposed for different time durations in dedicated furnaces, in order to expose the investigated specimens to elevated temperature [15,22]. In few cases only, the concrete specimens have been exposed to real flame [23].…”

Section: Introductionmentioning

confidence: 99%

Study on the Compressive Behaviour of Sustainable Cement-Based Composites Under 1-Hour Direct Flame Exposure

Vedrtnam¹,

Bedon²,

Barluenga³

2020

Preprint

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Fire is a significant threat to human life and civil infrastructures. Builders and architects are hankering for safer and sustainable alternatives of concrete that do not compromise with their design intent or fire safety requirements. The aim of the present work is to improve the residual compressive performance of concrete in the post-fire exposure, by incorporating by-products from urban residues. Based on sustainability and circular economy motivations, the attention is focused on rubber tire fly ash, aged brick powder, and plastic (PET) bottle residuals used as partial sand replacement. The selected by-products from urban residues are used for the preparation of Cement-Based Composites (CBCs) in two different proportions (10 % and 15 %). The thermal CBC behaviour is thus investigated under realistic fire scenarios (i.e., Direct Flame (DF) for 1 hour (1h)), by following the ISO 834 standard provisions, but necessarily resulting in non-uniform thermal exposure for the cubic specimens. The actual thermal exposure is further explored with a Finite Element (FE) model, giving evidence of thermal boundaries effects. The post-fire residual compressive strength of heated concrete and CBC samples is hence experimentally derived, and compared to unheated specimens in ambient conditions. From the experimental study, the enhanced post-fire performance of CBCs with PET bottle residual is generally found superior to other CBCs or concrete. The structure-property relation is also established, with the support of Scanning Electron Microscopy (SEM) micrographs. Based on existing empirical models of literature for the prediction of the compressive or residual compressive strength of standard concrete, newly developed empirical relations for both concrete and CBCs are assessed.

show abstract

Testing of Action of Direct Flame on Concrete

Cited by 4 publications

References 4 publications

Study on the Compressive Behaviour of Sustainable Cement-Based Composites under One-Hour of Direct Flame Exposure

Study on the Compressive Behaviour of Sustainable Cement-Based Composites under One-Hour of Direct Flame Exposure

The Thermal Effects on the Self-Compacting Concrete Beams Exposed to the Fire

Study on the Compressive Behaviour of Sustainable Cement-Based Composites Under 1-Hour Direct Flame Exposure

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