Mechanical properties of steel fiber-reinforced UHPC mixtures exposed to elevated temperature: Effects of exposure duration and fiber content

Ahmad, Shamsad; Rasul, Mehboob; Adekunle, Saheed Kolawole; Al‐Dulaijan, Salah U.; Maslehuddin, Mohammed; Ali, Syed Imran

doi:10.1016/j.compositesb.2018.12.083

Cited by 110 publications

(34 citation statements)

References 27 publications

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“…Lau and Anson [33] showed that the porosity of concrete increased with the maximum heating temperature, but the porosity of SFRC was lower and the average pore diameter was smaller than that of concrete without fiber. Ahmad et al [101] investigated the microstructure of the matrix-fiber interface of steel-fiber-reinforced high-performance concrete exposed to high temperatures. As is shown in Figure 13, their results indicated that the matrix-fiber bond strength degraded gradually with increasing exposure time.…”

Section: Microstructure Of Sfrc Exposed To High Temperaturementioning

confidence: 99%

“…A few studies [11,13,41] have concluded that steel fiber improved the microstructure of RPC after an elevated temperature. In addition, the investigation of Chen et al Ahmad et al [101] investigated the microstructure of the matrix-fiber interface of steel-fiber-reinforced high-performance concrete exposed to high temperatures. As is shown in Figure 13, their results indicated that the matrix-fiber bond strength degraded gradually with increasing exposure time.…”

Section: Microstructure Of Sfrc Exposed To High Temperaturementioning

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: Microstructure Of Sfrc Exposed To High Temperaturementioning

confidence: 99%

Section: Microstructure Of Sfrc Exposed To High Temperaturementioning

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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“…Beneberu and Yazdani (2019) believed that the research on fire resistance of bridges was inadequate compared to that on earthquake, wind, and flood. Some scholars have studied the performance of prestressed concrete bridges after fire damage (Liu et al 2019c) and that of UHPC beams subjected to long periods of high temperature action (Ahmad et al 2019). It was found that high temperature had a great influence on stiffness and bending strength of the members, but not on compressive strength and toughness of the materials and basic frequency of the structure.…”

Section: Concrete Bridgementioning

confidence: 99%

Review of annual progress of bridge engineering in 2019

Zhao

Yuan

Wei

et al. 2020

ABEN

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Bridge construction is one of the cores of traffic infrastructure construction. To better develop relevant bridge science, this paper introduces the main research progress in China and abroad in 2019 from 13 aspects, including concrete bridges and the high-performance materials, the latest research on steel-concrete composite girders, advances in box girder and cable-supported bridge analysis theories, advance in steel bridges, the theory of bridge evaluation and reinforcement, bridge model tests and new testing techniques, steel bridge fatigue, wind resistance of bridges, vehicle-bridge interactions, progress in seismic design of bridges, bridge hydrodynamics, bridge informatization and intelligent bridge and prefabricated concrete bridge structures.

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“…The surface of the brass-coated fibers is stable at this exposure temperature. The formation of cracks is caused by accumulated thermal stress, vapor pressure and, inconsistent expansion of the matrix and aggregate [14,[72][73][74]. Significant cracks are apparent on the images of cross sections from the UHPC samples exposed to 600 • C (Figure 18A,B) and 800 • C (Figure 19A,B).…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Effect of Elevated Temperature on the Bond Strength of Prestressing Reinforcement in UHPC

et al. 2020

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The study explores the effect of elevated temperatures on the bond strength between prestressing reinforcement and ultra-high performance concrete (UHPC). Laboratory investigations reveal that the changes in bond strength correspond well with the changes in compressive strength of UHPC and their correlation can be mathematically described. Exposition of specimens to temperatures up to 200 °C does not reduce bond strength as a negative effect of increasing temperature is outweighed by the positive effect of thermal increase on the reactivity of silica fume in UHPC mixture. Above 200 °C, bond strength significantly reduces; for instance, a decrease by about 70% is observed at 800 °C. The decreases in compressive and bond strengths for temperatures above 400 °C are related to the changes of phase composition of UHPC matrix (as revealed by X-ray powder diffraction) and the changes in microstructure including the increase of porosity (verified by mercury intrusion porosimetry and observation of confocal microscopy) and development cracks detected by scanning electron microscopy. Future research should investigate the effect of relaxation of prestressing reinforcement with increasing temperature on bond strength reduction by numerical modelling.

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Mechanical properties of steel fiber-reinforced UHPC mixtures exposed to elevated temperature: Effects of exposure duration and fiber content

Cited by 110 publications

References 27 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

Review of annual progress of bridge engineering in 2019

Effect of Elevated Temperature on the Bond Strength of Prestressing Reinforcement in UHPC

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