Heat exposure tests on various types of fibre mortar

Ezziane, Mohammed; Molez, Laurent; Jauberthie, Raoul; Rangeard, Damien

doi:10.1080/19648189.2011.9693360

Cited by 17 publications

(4 citation statements)

References 10 publications

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“…The flexural testing of SFRC has been performed on prisms, but the specimen sizes used previously varied because of the lack of standardized test specifications, including 150 mm × 150 mm × 550 mm [56], 150 mm × 150 mm × 600 mm [25], 100 mm × 100 mm × 400 mm [33], and 100 mm × 100 mm × 500 mm [57]. Lau and Anson [33] concluded that the flexural properties of concrete reinforced with 1% steel fiber were better than those of concrete without steel fiber when the maximum exposure temperature ranged from 105 to 800 • C. However, non-fiber mixtures and SFRC differed in terms of residual flexural strength when the mixtures were exposed to temperatures beyond 800 • C. This may be due to the steel fibers, which provided a considerable degree of ductility when concrete was heated below 800 • C. However, as the temperature increased further, the mechanical properties of the steel fibers appeared to be degraded owing to oxidation and corrosion [58,59], resulting in insufficient ductility. The residual flexural strength of different fiber-reinforced concrete (FRC) has been proposed by Jameran et al [56].In their study, a concrete mixture was reinforced by hybrid fibers with a volume content of 1.5%, in which the percentages of steel and propylene fiber were 100% and 0%, 75% and 25%, 50% and 50%, 25% and 75%, and 0% and 100%.…”

Section: Residual Flexural Propertiesmentioning

confidence: 99%

“…This may be due to the steel fibers, which provided a considerable degree of ductility when concrete was heated below 800 °C. However, as the temperature increased further, the mechanical properties of the steel fibers appeared to be degraded owing to oxidation and corrosion [58,59], resulting in insufficient ductility. The residual flexural strength of different fiber-reinforced concrete (FRC) has been proposed by Jameran et al [56].In their study, a concrete mixture was reinforced by hybrid fibers with a volume content of 1.5%, in which the percentages of steel and propylene fiber were 100% and 0%, 75% and 25%, 50% and 50%, 25% and 75%, and 0% and 100%.…”

Section: Residual Flexural Propertiesmentioning

confidence: 99%

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Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

et al. 2020

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Steel-fiber-reinforced concrete (SFRC) is being increasingly applied to various buildings and civil infrastructure as an advanced cementitious composite. In recent years, the requirements for SFRC in the construction industry have increased. Additionally, the fire resistance of SFRC has attracted attention; therefore, numerous investigations regarding the residual properties of SFRC have been conducted. This paper critically reviews the mechanical properties of SFRC subjected to elevated temperatures, including its residual compressive strength, flexural strength, tensile strength, elastic properties, fracture properties, and stress–strain relationships. The residual mechanical performance of SFRC and the action mechanism of steel fibers are reviewed in detail. Moreover, factors affecting the explosive spalling of concrete at high temperatures as well as the effect of steel fibers on the microstructure of heated concrete are discussed. It is demonstrated that, in general, SFRC exhibits better residual mechanical properties when exposed to elevated temperatures than plain concrete and can prevent the risk of explosive spalling more effectively. The purpose of this literature review is to provide an exhaustive insight into the feasibility of SFRC as a refractory building material; additionally, future research needs are identified.

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Section: Residual Flexural Propertiesmentioning

confidence: 99%

Section: Residual Flexural Propertiesmentioning

confidence: 99%

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

et al. 2020

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“…At this range of temperature, literature indicated a reduction of tensile properties of SF and peeling off of cement matrix from its surface. When 800 °C is reached, the bond between fibers and cement matrix is entirely broken, leading to more pronounced mechanical and chemical alterations in fiber reinforced concretes (FRCs) [20,21].…”

Section: Introductionmentioning

confidence: 99%

The Efficiency of Non-Destructive Testing to Estimate the Damage Level of Fiber-Reinforced Concrete Exposed to High Temperatures

Nefoussi

Ezziane

Siad

et al. 2023

MSF

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The feasibility of determining the extent of damage in fibered concrete after being subjected to high temperatures, using non-destructive methods was investigated. The study was conducted on four concrete mixtures with different fiber types. The specimens underwent a curing process at 23 °C before being exposed to different high temperatures of 400 °C, 600 °C, and 800 °C. After cooling to ambient temperature, various non-destructive tests including ultrasonic pulse velocity testing (UPV), the resonance frequency test (RF), the dynamic modulus of elasticity (Ed), the thermal conductivity test (λ), and Schmid Rebound Hammer (SRH), were performed. To evaluate the sensitivity of non-destructive techniques to assess the damage of fiber-reinforced concrete, the Lemaitre coefficient was used as a variable to describe the extent of the damage. The results indicated that the highest damage levels were obtained through the modulus of elasticity technique regardless of the type of concrete mixture or temperature exposure. There was also a potential agreement found between thermal and ultrasonic methods in evaluating the thermal degradation of concrete.

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“…L'influence mécanique de différents types de fibres après exposition à des températures élevées a été précédemment étudiée ( [3]). Dans cet article, nous avons étudié le comportement mécanique de mortiers normalisés, de mortiers renforcés de fibres d'acier, de mortiers avec fibres de polypropylène et de mortiers hybrides, traités thermiquement à 400°C, 600°C, 800°C et 1000°C.…”

Section: Introductionunclassified

Evolution de la résistance au poinçonnement d’un matériau cimentaire soumis à la flamme

Ezziane

Kadri

Jauberthie

et al. 2012

MATEC Web of Conferences

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Abstract. The mechanical properties of the cement-based materials, when subjected to high temperatures, are reduced. The surface cracking causes a drop in flexural strength very sensitive to the surface state. The mortars tested are mortars reinforced with fibres of various types: control sample without fibres, steel fibre mortar, polypropylene fibre mortar and steel / polypropylene fibre mortar. After testing these materials in the oven by varying the temperature parameter, we were interested to the behaviour of the test specimens in the presence of a propane flame. The fibre-reinforced mortar is subjected to the flame on one face; the evolution of the temperature gradient is followed in time. The influence of fibre type is quantified. The cracks appear both on the side exposed to the flame but also, and to a lesser extent on the cold face. After a certain exposure time, the mechanical properties are compared. A mechanical test was developed to determine the influence of cracking on the punching strength. The role of fibres, by their nature and by their position relative to the hot face is analysed. When the plates tested are designed with a low water to cement ratio, the phenomenon of spailling appears. The intensity of this phenomenon varies with the nature of the fibering.Résumé. Les matériaux à base cimentaire, lorsqu'ils sont soumis à des températures élevées, voient leurs caractéristiques mécaniques diminuer. La fissuration de surface entraîne notamment une chute de la résistance en flexion très sensible à l'état de surface. Les mortiers testés sont des mortiers fibrés avec des fibres de différentes natures: échantillon témoin non fibré, mortier fibré acier, mortier fibré polypropylène, mortier fibré acier/polypropylène. Après avoir testé ces matériaux au four en faisant varier le paramètre température, nous nous sommes intéressés au comportement en présence d'une flamme propane. Le mortier fibré est soumis à la flamme sur une face, l'évolution du gradient thermique est suivie dans le temps. L'influence du type de fibres est quantifiée. Les fissurations apparaissent aussi bien sur la face exposée à la flamme mais aussi, et de façon moindre sur la face froide. Après un certain temps d'exposition, les caractéristiques mécaniques sont comparées. Un test mécanique est mis au point afin de déterminer l'influence de la fissuration sur la résistance au poinçonnement. Le rôle des Web of Conferences

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Heat exposure tests on various types of fibre mortar

Abstract: ABSTRACT. The advantage of steel fibres in cement based materials vis-à-vis mechanical reinforcement is widely recognized in

Cited by 17 publications

References 10 publications

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

The Efficiency of Non-Destructive Testing to Estimate the Damage Level of Fiber-Reinforced Concrete Exposed to High Temperatures

Evolution de la résistance au poinçonnement d’un matériau cimentaire soumis à la flamme

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