Experimental study of fire damage to reinforced concrete tunnel slabs

Hua, Nan; Khorasani, Negar Elhami; Tessari, Anthony; Ranade, Ravi

doi:10.1016/j.firesaf.2021.103504

Cited by 31 publications

(10 citation statements)

References 46 publications

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“…It was also observed that the segment's edge may fracture spontaneously in the absence of external forces. Hua et al [7] studied the effects of parameters such as polypropylene fiber, Materials 2024, 17, 1418 2 of 20 restraint, and fire duration on tunnel lining roof fire damage. The results showed that the addition of polypropylene fiber can reduce the degree of peeling of floor concrete but may increase the number of cracks and residual deformation.…”

Section: Introductionmentioning

confidence: 99%

Test Research on Residual Mechanical Properties of Fiber-Reinforced Concrete Segments after High Temperature

Zong,

Wang,

Wang

et al. 2024

Materials

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In order to research the residual mechanical properties of concrete shield tunnel segments after exposure to high temperatures, two types of concrete segments were designed: a self-compacting concrete segment and a mixed fiber (steel fiber and polypropylene fiber) self-compacting concrete segment. The mechanical properties of seven blocks of concrete segments (five segments after high-temperature exposure and two segments at room temperature) were tested to analyze the influence of different loading sizes and fibers on the development of cracks after high temperature, failure mode, crack width, deformation, and so on in the concrete segments. The results showed that the damage model of the segment after exposure to high temperature and the segment at room temperature were crushed in the pressurized zone, but the high temperature had little effect on the concrete in the pressurized area. The size of the preload at high temperatures had little effect on the remaining load capacity, and the effect on the number of cracks was mainly concentrated on the internal arc surface of the segment. After high-temperature exposure, the number of cracks on the sides and inner arc surface of the segment increased, and the development of cracks was concentrated as several major cracks at high temperatures. When fibers were incorporated, the cracks in the segment became obvious, where the cracks at the loading point became denser and the interval distance became smaller.

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Section: Introductionmentioning

confidence: 99%

Test Research on Residual Mechanical Properties of Fiber-Reinforced Concrete Segments after High Temperature

Zong,

Wang,

Wang

et al. 2024

Materials

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“…The heat resistance of traditional concrete is significantly influenced by the type of aggregate and binder used in its mix design. This is because of the heat and duration of the fire, the extent of the structural component, and the moisture content of traditional concrete [4,[8][9][10]. Color changes, cracks, and spalling are the first signs of heat-damaged concrete [11].…”

Section: Introductionmentioning

confidence: 99%

The role of chemistry and fineness of metakaolin on the fresh properties and heat resistance of blended fly ash-based geopolymer

et al. 2023

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Sensible thermal energy storage using concrete as a storage medium is a promising technology that helps minimize energy in power plant. The purpose of this study is to evaluate the potential benefits of metakaolin (MK) as a partial substitute for fly ash-based geopolymer for heat resistance. As a partial substitute (5 and 20 wt.%) for fly ash (FA), nine metakaolins containing different alumina contents were selected. In order to assess their potential for storing high-temperature thermal energy, physical and microstructural analyses were performed before and after heat exposure up to 500 °C. Low packing density limits the workability of some metakaolins and increases water demand in pastes. The mechanical properties of geopolymer weaken as the temperature is raised (< 500 °C). The high alumina content of some metakaolins, however, helps to mitigate strength loss during high temperatures. A higher dosage of metakaolin has also shown to prevent this deterioration of strength. A reduction in strength under heating is caused by both dehydration and dehydroxylation. The higher fineness and alumina content of MK have demonstrated significant potential to enhance the heat resistance of FA-based geopolymers. As a result, the geopolymer paste developed is suitable for being used in heat-resistant applications.Article Highlights Fly ash was the main precursor of as prepared alkali-activated binders. Adding metakaolin enhances the resistance of hardened materials under thermal load. The higher the alumina content inside metakaolin is, the higher the performance is.

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“…Fire damage imparted to a tunnel liner is characterized using temperature criteria and structural response [10]. A combination of influencing factors were evaluated using static loading tests to evaluate that fire damage imparted to the tunnel linings [11]. The thermal and spalling behaviours of fire-resistant concrete tunnel lining segments were analyzed [12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Residual Compressive Strength of Tunnel Lining Concrete Structure after Fire Damage Based on Ultrasonic Pulse Velocity and Shear-Wave Tomography

et al. 2022

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In this study, ultrasonic pulse velocity (UPV) and ultrasonic shear-wave tomography are combined to measure the residual compressive strength (RCS) of small-scale lining concrete blocks and to detect inner defects in the lining structure. The characteristics of and variations in the RCS of test blocks after being exposed to elevated temperatures (200–800 °C) and constant heating times (2 h, 3 h, and 4 h) were studied. At 800 °C, the RCS values reduced by 64.4%, 69.2%, and 74.6% at heating times of 2 h, 3 h, and 4 h. Scanning electron microscopy (SEM) was used for the micro-phase analysis of the samples that had been exposed to high temperatures. The heating time and RCS as well as the SEM micro-structure relationship were compared. Finally, a tunnel lining slab sample was designed to simulate the post-fire damage inside the blocks. Additionally, shear-wave tomography with 32 probes was able to detect the ϕ10 mm void defects at a depth of 200 mm.

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Experimental study of fire damage to reinforced concrete tunnel slabs

Cited by 31 publications

References 46 publications

Test Research on Residual Mechanical Properties of Fiber-Reinforced Concrete Segments after High Temperature

Test Research on Residual Mechanical Properties of Fiber-Reinforced Concrete Segments after High Temperature

The role of chemistry and fineness of metakaolin on the fresh properties and heat resistance of blended fly ash-based geopolymer

Evaluation Residual Compressive Strength of Tunnel Lining Concrete Structure after Fire Damage Based on Ultrasonic Pulse Velocity and Shear-Wave Tomography

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