A study of spalling behaviour of PAN fibre‐reinforced concrete by thermal analysis

Sarvaranta, Leena; Elomaa, Matti; Järvelä, Eliisa

doi:10.1002/fam.810170505

Cited by 16 publications

(6 citation statements)

References 5 publications

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“…Some of these instrumental techniques, such as thermal analysis, are usually used to study the behaviour of certain materials when exposed to the action of fire and high temperatures. As a rule, the fundamental objective of these analyses is to look at the possible improvements that could come about through the use of certain materials that could substitute or complement others [20,21].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the behaviour of the structural concrete after the fire at the Windsor Building in Madrid

Menéndez

Vega

2009

Fire and Materials

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SUMMARYThe analysis of the concrete subjected to high temperatures is usually undertaken by means of tests specifically designed and carried out in the laboratory, or by using theoretical approaches using standardized curves for theoretical fires.An analysis by different techniques has been carried out on structural concrete to real fire of Windsor Building in Madrid, which was severally damaged by a fire in 2005. These techniques are X-ray diffraction, differential thermal and thermogravimetric analysis and backscattered electron microscopy with dispersive X-ray microanalysis. Samples of the concrete were taken from different floors in the building and analyses were carried out at different depths starting from the surface exposed to the fire itself. The analysis allows the damaged area to be limited as well as situating the 500 • C isotherm in the concrete element.In accordance with the results obtained, the damage is limited to just a few centimeters from the surface exposed to the fire itself, in spite of its prolonged exposure to the fire. This would justify that the concrete has demonstrated a suitable resistant behaviour. Likewise, it can be deduced from the results obtained that the fire, to which the concrete was subjected, can be qualified as severe.Also, these results can confirm that the calculation hypothesis in the project is correct in relation to the fire resistance exigencies of the concrete.

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Section: Introductionmentioning

confidence: 99%

Analysis of the behaviour of the structural concrete after the fire at the Windsor Building in Madrid

Menéndez

Vega

2009

Fire and Materials

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“…Polypropylene (PP) fibers have numerous properties that make them suitable for incorporation to concrete: low cost, ductility, ease of dispersal and good anchoring capacity. Polypropylene fibers do not corrode, are thermally stable (high melting point), chemically inert and very stable in the alkaline environment of concrete [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Mortar Using Polypropylene Fibers

Dawood¹,

Building²,

Ghanim³

et al. 2020

J Civ Eng Res Technol

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In the present paper the behavior of mortar reinforced with polypropylene fibers was studied. Different percentages of polypropylene fibers such as 0, 0.2, 0.4, 0.6 and 0.8% as volumetric fractions were used. Different properties which are flowability, density, compressive strength, flexural strength and splitting tensile strength were evaluated for all mix combinations. The experimental results indicated that a reduction in flowability was obtained with increased polypropylene fibers content. Besides, it can be concluded that the incorporation of polypropylene fiber may significantly reduce the density of mortar. The use of low volume fraction of polypropylene fiber improves the mechanical properties of HPM. Thus, the use of 0.2% of such fiber increases compressive strength by about (4-10%), at various ages.

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“…Specially, thermal analysis, scanning electron microscopy and X-ray diffraction are useful to analyze the concrete exposed to fire. It is possible to identify the temperature intervals in which the decomposition of certain compounds present in the cement paste takes place (Sarvaranta, L. et al 1993, Menéndez, E. & Vega, L. 2010. The behavior of the pastes in the presence of temperature allows the monitoring of the existence of certain products, when these pastes are tested by means of simultaneous analysis by Differential Thermal Analysis and Thermogravimetry (DTA-TG).…”

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confidence: 99%

Method to evaluate the residual strength in concrete elements exposed to fire using physic-chemical and microstructural parameters

Menéndez¹,

Andrade²

2012

Concrete Repair, Rehabilitation and Retrofitting III

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After the exposition of concrete to fires, it is necessary to evaluate the residual strength of the concrete affected elements. Some methods to evaluate the residual capacity are based on the knowing of the depth of concrete affected by temperatures higher than 500ºC. The layer of concrete that have been exposed to temperatures upper than 500ºC must be not taken into account to do the structural recalculation. In the present work different physic-chemical parameters are used in order to define the alteration zones from the surface exposed to high temperature to the interior. Different layers of concrete exposed to fire are analyzed, from the surface, determining different physic-chemical parameters related with thermal behavior, using DTA-TG, and determining the main crystalline compounds, using XRD. Also, the microstructural analysis by BSE-EDX permits to corroborate the situation of concrete exposed to high temperature.the crystallization water of the hydration products disappears gradually between 100ºC and 1,000ºC. It is considered that the total dehydration of the CSH comes about from the exposure of pastes to 1,000ºC for 15 minutes, in small-sized samples (Taylor, H.F.W. 1997, Mehta, P.K. 1986). Other transformations are related with the carbonates that can be formed due to the natural carbonation or by recarbonation processes associated with the CO 2 or CO formation during the fire (Menéndez, E. et al 2012a). Different instrumental techniques are used with the aim of analyzing the behavior of the concrete exposed to a real fire or laboratory tests. Specially, thermal analysis, scanning electron microscopy and X-ray diffraction are useful to analyze the concrete exposed to fire. It is possible to identify the temperature intervals in which the decomposition of certain compounds present in the cement paste takes place (Sarvaranta, L. et al 1993, Menéndez, E. & Vega, L. 2010. The behavior of the pastes in the presence of temperature allows the monitoring of the existence of certain products, when these pastes are tested by means of simultaneous analysis by Differential Thermal Analysis and Thermogravimetry (DTA-TG). Analysis through X-ray diffraction (XRD) also allows the crystalline phases present in the original or burnt concretes to be identified. Also, microstructural and compositional changes can be

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A study of spalling behaviour of PAN fibre‐reinforced concrete by thermal analysis

Cited by 16 publications

References 5 publications

Analysis of the behaviour of the structural concrete after the fire at the Windsor Building in Madrid

Analysis of the behaviour of the structural concrete after the fire at the Windsor Building in Madrid

Mechanical Properties of Mortar Using Polypropylene Fibers

Method to evaluate the residual strength in concrete elements exposed to fire using physic-chemical and microstructural parameters

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