Investigation of the feasibility of using recycled steel fibers in tunnel lining segments

Sharghi, Mohammad; Chakeri, Hamid; Afshin, Hassan; Török, Ákos; Dias, Daniel

doi:10.1016/j.tust.2021.103826

Cited by 12 publications

(22 citation statements)

References 17 publications

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“…Details of the mixing designs and initial evaluation of the feasibility of using recycled steel fibers were presented in Ref. [4].…”

Section: Materials and Mixing Designmentioning

confidence: 99%

“…It should be noted that the mechanical properties of mixing designs in details such as calibration and definition method of FRC, aggregate gradations of the mixing designs, the number of specimens for each test, standard deviation and coefficient of variation of the experimental data for each test, stress-strain curve of the uniaxial compressive test, and load-displacement curve of the flexural test have been explained in Ref. [4].…”

Section: Materials and Mixing Designmentioning

confidence: 99%

“…This kind of loading can lead to undesirable and serious cracks and damages. [1][2][3][4] Due to the performance of the loading shoes, it was found that the presence of the fibers in concrete could stabilize the cracks. Then, it leads to smaller cracks and reduces in the areas of the shoes.…”

Section: Introductionmentioning

confidence: 99%

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Structural and environmental performance of recycled steel fiber reinforced concrete segment under the thrust force of the tunnel boring machine jacks

Sharghi

Afshin

Chakeri

et al. 2022

Structural Concrete

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The present study evaluates the structural and environmental performance of recycled fibers as a low-cost and eco-friendly reinforcement of segmental tunnel lining. In this research, the defect effects in the support area are investigated using three types of scaled panel samples. In addition to the fiber-only reinforced concrete, the performance of a new hybrid design is evaluated. The axial displacements, crack widths, crack lengths, and crack depths were monitored by displacement gauges and image processing. The experimental and numerical results show that the presence of defects, in addition to increasing at least five times the opening of the spalling crack, induces the appearance of new secondary cracks. Based on the results, it was observed that recycled fibers have a good ability to reduce the opening and growth of cracks. The hybrid reinforced design showed a significant performance compared to conventional reinforced segments, even in the most critical support conditions. According to several environmental parameters, the highest environmental compatibility in continuous support conditions is related to the fiber-only reinforced concrete design; however, with presence of defects in the support area, the new hybrid reinforced design has shown the highest environmental compatibility in most environmental parameters. It was finally concluded that the fiber-only reinforced concrete with recycled steel fibers and the new proposed hybrid reinforced concrete designs had high efficiencies in all cases in terms of structural, environmental, and economical performances. In addition to significantly reducing the crack openings in the hybrid reinforced design, the used rebars were reduced by about 40%.defect in support area, environmental, FE analysis, hybrid design, laboratory tests, recycled steel fiber, scaled panel sample, segmental lining Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…Details of the mixing designs and initial evaluation of the feasibility of using recycled steel fibers were presented in Ref. [4].…”

Section: Materials and Mixing Designmentioning

confidence: 99%

Section: Materials and Mixing Designmentioning

confidence: 99%

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Structural and environmental performance of recycled steel fiber reinforced concrete segment under the thrust force of the tunnel boring machine jacks

Sharghi

Afshin

Chakeri

et al. 2022

Structural Concrete

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“…Prefabricated reinforced concrete segments in most cases are loaded with traction jacks at the stage of installation [8]. Then it is necessary at this stage to prevent the formation of cracks and damage to the segments to ensure their integrity.…”

Section: Introductionmentioning

confidence: 99%

Justification of the method of soil densification of the interstation tunnel by jet injection based on computer modeling

Вапнічна

Коробійчук

Zuievska

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The article is devoted to a topical issue - the development of a method of densification of the base of the underground interstation tunnel to prevent further intensive subsidence of tunnel structures. Based on computer-mathematical modeling, the work establishes experimental dependence between the angle of inclination of jet grouting piles and the amount of subsidence of the distribution plate on which the tunnel structures rest upon. Inspection of the technical condition and analysis of defects in a comprehensive comparison with subsidence graphs allowed us to identify the main typical deformations during subsidence of a shallow tunnel built from blocks of a solid-section frame, namely their characteristic features, geometric parameters and placement points.

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“…Furthermore, it was observed that the SFRC segments achieved improved durability performance in comparison with the RC segments [ 31 ]. In another study, Sharghi et al (2021) [ 32 ] reported the use of recycled SFRC in tunnel linings and studied the thrust load application imposed during installation of segments using finite element analysis. Qiu et al (2021) [ 33 ] investigated the mechanical behavior, force transfer mechanism and failure criteria of segmental joints by performing various tests on prototype segments.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Ultrahigh-Performance Concrete Tunnel Lining Segments

Abbas

Nehdi

2021

Materials

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Ultrahigh-performance concrete (UHPC) is a novel material demonstrating superior mechanical, durability and sustainability performance. However, its implementation in massive structures is hampered by its high initial cost and the lack of stakeholders’ confidence, especially in developing countries. Therefore, the present study explores, for the first time, a novel application of UHPC, incorporating hybrid steel fibers in precast tunnel lining segments. Reduced scale curved tunnel lining segments were cast using UHPC incorporating hybrid 8 mm and 16 mm steel fibers at dosages of 1%, 2% and 3% by mixture volume. Flexural and thrust load tests were conducted to investigate the mechanical behavior of UHPC tunnel lining segments thus produced. It was observed that the flow of UHPC mixtures decreased due to steel fibers addition, yet steel fibers increased the mechanical and durability properties. Flexural tests on lining segments showed that both the strain hardening (multiple cracking) and strain softening (post-peak behavior) phases were enhanced due to hybrid addition of steel fibers in comparison with the control segments without fibers. Specimens incorporating 3% of hybrid steel fibers achieved 57% increase in ultimate load carrying capacity and exhibited multiple cracking patterns compared to that of identical UHPC segments with 1% fibers. Moreover, segments without fibers incurred excessive cracking and spalling of concrete at the base under the thrust load test. However, more stable behavior was observed for segments incorporating steel fibers under the thrust load, indicating its capability to resist typical thrust loads during tunnel lining field installation. This study highlights the potential use of UHPC with hybrid steel fibers for improved structural behavior. Moreover, the use of UHPC allows producing structural members with reduced cross-sectional dimensions, leading to reduced overall structural weight and increased clear space.

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Investigation of the feasibility of using recycled steel fibers in tunnel lining segments

Cited by 12 publications

References 17 publications

Structural and environmental performance of recycled steel fiber reinforced concrete segment under the thrust force of the tunnel boring machine jacks

Structural and environmental performance of recycled steel fiber reinforced concrete segment under the thrust force of the tunnel boring machine jacks

Justification of the method of soil densification of the interstation tunnel by jet injection based on computer modeling

Mechanical Behavior of Ultrahigh-Performance Concrete Tunnel Lining Segments

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