Influence of fire on temperature gradient and physical-mechanical properties of macro-synthetic fiber reinforced concrete for tunnel linings

Serafini, Ramoel; Dantas, Sérgio Roberto Andrade; Salvador, Renan P.; Agra, Ronney R.; Rambo, Dimas Alan Strauss; Berto, Antonio F.; Figueiredo, Antônio Domingues de

doi:10.1016/j.conbuildmat.2019.04.133

Cited by 35 publications

(47 citation statements)

References 40 publications

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“…The range of moderate temperatures includes those below 80 • C, which can be found in severe operating conditions in some industrial applications, such as those related to energy [14]. Extensive literature has been published on FRC and MSFRC elements at extremely high temperatures in simulations of accidental fires [15][16][17][18], but those temperatures are beyond the scope of this work.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Flexural Behavior of Fiber-Reinforced Concretes Exposed to Moderate Temperatures

2021

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The use of synthetic fibers in fiber-reinforced concretes (FRCs) is often avoided due to the mistrust of lower performance at changing temperatures. This work examines the effect of moderate temperatures on the flexural strengths of FRCs. Two types of polypropylene fibers were tested, and one steel fiber was employed as a reference. Three-point bending tests were carried out following an adapted methodology based on the standard EN 14651. This adapted procedure included an insulation system that allowed the assessment of FRC flexural behavior after being exposed for two months at temperatures of 5, 20, 35 and 50 °C. In addition, the interaction of temperature with a pre-cracked state was also analyzed. To do this, several specimens were pre-cracked to 0.5 mm after 28 days and conditioned in their respective temperature until testing. The findings suggest that this range of moderate temperatures did not degrade the behavior of FRCs to a great extent since the analysis of variances showed that temperature is not always a significant factor; however, it did have an influence on the pre-cracked specimens at 35 and 50 °C.

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Section: Introductionmentioning

confidence: 99%

A Study of the Flexural Behavior of Fiber-Reinforced Concretes Exposed to Moderate Temperatures

2021

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“…It is important to remark that the occurance of a fire induces several temperature related effects on SFRC that changes the overall behavior of the composite, both in meso-and structural scale. Therefore, the first concept that needs to be conceived is that a unifacial fire event induces a wide range of internal temperatures, which results in a wide range of mechanical properties inside the composite [68]. These changes in the mechanical properties can be correlated to the changes in microstructural properties of the cement paste, steel fibers, aggregates, and the interfaces between the different phases of the composite.…”

Section: Literature Reviewmentioning

confidence: 99%

Section: Physical Chemical and Mineralogical Changesmentioning

confidence: 99%

“…The majority of the thermal-related changes that occur in plain concrete can be extrapolated to SFRC, specially regarding the hardened cement paste and the aggregates [68]. The increase in temperature affects the thermal properties [70][71][72] and density [68,71] of Porland cement based materials. The Eurocode [20] prescribes analytical equations capable of estimating the density (), thermal conductivity (K), and the specific heat (C) of plain concrete as a function of temperature, which are commonly employed in SFRC applications [38,39].…”

Section: Physical Chemical and Mineralogical Changesmentioning

confidence: 99%

“…The dehydroxylation and loss of interlayer water of calcium silicate hydrate (C-S-H) occurs over a wide range of temperatures. The C-S-H begins to decompose into nesosilicates in the form of belite (C 2 S) for temperatures of 150-200 °C, however with a significantly different morphology than the silicates found in anhydrous cement paste [68]. Additionally, the inherent crystal structure of this nesosilicates results in variable Ca-Ca bond length [80], which may significantly affect the rehydration kinetics due to differences in terms of hydraulic activity.…”

Section: Physical Chemical and Mineralogical Changesmentioning

confidence: 99%

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The effect of fire on pre-cast steel fiber reinforced concrete for tunnel linings: from microstructure to structural simulation.

Serafini¹

Self Cite

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This study aims to evaluate the effect of elevated temperatures on the physical, mechanical, and microstructural properties of a hooked-end steel fiber for temperatures of 100, 350, 750, and 1000 °C. Results show that an oxidation layer is formed on the surface of the fibers exposed to temperatures of 750 °C and above, which leads to an increase in external diameter and mass. Reductions in tensile strength are directly proportional to the temperature increase, while rupture strain values significantly increase for temperatures above the recrystallization temperature of steel. The present study contributes to the understanding of the contribution of steel fibers to the overall behavior of the composite after temperature exposure and serve as input for recently developed numerical models.

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Mechanical properties of macro synthetic fiber reinforced concrete at elevated temperatures: A systematic review and meta‐analysis

Clarke

Ghiji

Fragomeni

et al. 2022

Structural Concrete

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The current infrastructure boom combined with the latest outcomes from 26th UN Climate Change Conference of the Parties (COP 26) seeking a carbon neutral society by 2050 have driven the increasing need for sustainable alternatives to be considered in construction. One such alternative is macro synthetic fibers, which have been gaining acceptance on major infrastructure projects. However, only limited uptake has occurred in permanent structures, due to a lack of knowledge around the behavior of macro synthetic fiber reinforced concrete (MSFRC) when exposed to elevated temperatures. Existing Australian and international design standards do not take into account the loss of strength for MSFRC after exposure to elevated temperatures. Hence, this systematic review sets out to combine all the existing knowledge on the mechanical properties of MSFRC and lay the groundwork for determining acceptable

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Influence of fire on temperature gradient and physical-mechanical properties of macro-synthetic fiber reinforced concrete for tunnel linings

Cited by 35 publications

References 40 publications

A Study of the Flexural Behavior of Fiber-Reinforced Concretes Exposed to Moderate Temperatures

A Study of the Flexural Behavior of Fiber-Reinforced Concretes Exposed to Moderate Temperatures

The effect of fire on pre-cast steel fiber reinforced concrete for tunnel linings: from microstructure to structural simulation.

Mechanical properties of macro synthetic fiber reinforced concrete at elevated temperatures: A systematic review and meta‐analysis

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