Experimental study on color change and compression strength of concrete tunnel lining in a fire

Du, Sheng; Zhang, Yuchun; Sun, Qiang; Gong, Weiyi; Geng, Jishi; Zhang, Kejian

doi:10.1016/j.tust.2017.08.025

Cited by 35 publications

(6 citation statements)

References 25 publications

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“…Typical concrete specimens were tested under dif ferent elevated temperatures, as seen in Figure 2. MIRA is a low frequency (20-100 kHz multifunctional phased array ultrasonic system that can be used to detect objects, inter faces, and anomalies in concrete structures [30]. Since the ultrasonic probes in MIRA do not require a coupling gel to ensure the transmission of waves into the concrete, the probe can be moved from one position to the next position with almost no surface preparation Shear wave velocity is 2160 m/s.…”

Section: Upv Test and Shear-wave Tomography Equipmentmentioning

confidence: 99%

“…The evaluation of the residual tensile strength of fire-damaged concrete using a non-linear resonance vibration method was proposed [29]. A tricolor image processing method was proposed to analyze the color changes in the concrete lining of tunnels and to evaluate the damage caused by fire [30]. UPV is the most promising NDT method that has been used to establish an accurate relationship between the RCS and the UPV propagation in concrete after exposure to elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Upv Test and Shear-wave Tomography Equipmentmentioning

confidence: 99%

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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“…This package enabled us to measure the intensity of various component colors in regions of interest (ROIs). After that, the ultrasonic test was conducted; changes in ultrasonic waves can reflect the internal degradation of the concrete structure and predict internal collapse [26][27][28][29]. A Tektronix AFG3022B arbitrary waveform generator and Tektronix TDS1002B-SC provided the source and receiver signals, respectively, as digital oscilloscope in this experiment (Fig.…”

Section: Testing Proceduresmentioning

confidence: 99%

The Impact of Extended Heat Exposure on Rapid Sulphoaluminate Cement Concrete Up To 120°C

Tchekwagep

Mukhopadhyay

Wang

et al. 2021

Period. Polytech. Civil Eng.

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This study examined the stability of rapid sulphoaluminate cement concrete (R-SACC) when exposed to heat for extended periods of time. The physicochemical processes present in R-SACC as a function of temperature were determined through various tests. The general behavior of rapid sulphoaluminate cement (R-SAC) at a range of temperatures is summarized. The results show that observing color change could be a simple way to identify deterioration of R-SACC, along with the rebound hammer. The matrix formation of ettringite was broken and the mass of the hydrated product decreased with heat exposure; the major mineral composition of the paste consisted of CaSO4, CaCO3 and β-C2S; and the interface between aggregate and paste in the R-SACC become loosely structured with cracks. Between 50°C and 120°C, the rapid sulphoaluminate cement (R-SAC) paste first expanded and then shrank, and the shrinkage rate of R-SAC was much greater than that of R-SACC.

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“…Previous research studies have mainly focused on the fire performance of isolated members of shield tunnel. On the experimental side, various studies have been conducted to support grading evaluations and analysis of structural safety of lining structures in fire (Du et al, 2018;Qiao et al, 2019;Tomar and Khurana, 2019;Yan et al, 2012;Zhang et al, 2021c;e). Only a small number of experimental studies have been carried out on a whole tunnel structure setting in fire due to high costs.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical analysis of fire effects on the structural performance of shield tunnels

Shen

Zhu

Yan

et al. 2023

Tunnelling and Underground Space Technology

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Experimental study on color change and compression strength of concrete tunnel lining in a fire

Cited by 35 publications

References 25 publications

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

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

The Impact of Extended Heat Exposure on Rapid Sulphoaluminate Cement Concrete Up To 120°C

Thermo-mechanical analysis of fire effects on the structural performance of shield tunnels

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