Behaviours of reinforced concrete beams under low temperatures

Yan, Jia‐Bao; Xie, Jianwen

doi:10.1016/j.conbuildmat.2017.03.029

Cited by 55 publications

(13 citation statements)

References 12 publications

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“…However, Xie et al. (2014) and Yan and Xie (2017) found that the strain associated with the peak stress of all their specimens decreased as temperatures decreased. There remains uncertainty as to how the strain associated with the peak stress of concrete is affected by the low exposure temperatures.…”

Section: Literature Reviewmentioning

confidence: 96%

“…Research has found that the compressive strength of plain concrete increases as exposure temperatures are decreased; however, there have been huge variations in the relative strength increase found through experimental programmes (Krstulovic-Opara, 2007; Lee et al., 1988; Xie et al., 2014; and Yan and Xie, 2017). For example, Lee et al.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Meanwhile, Xie et al. (2014) and Yan and Xie (2017) conducted compression tests on concrete prisms that were exposed from 20°C to −160°C and found that the compressive strength also increased linearly as temperatures decreased, resulting in an increase of 26% at −80°C. It has been found in previous research that one of the largest contributing factors to the relative strength increase shown for concrete at low temperatures is the moisture content (Rostasy et al., 1979).…”

Section: Literature Reviewmentioning

confidence: 99%

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High strain rate and low temperature effects on the compressive behaviour of concrete

MacLean

Lloyd

2020

International Journal of Protective Structures

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Temperature and strain rate are important factors when considering the mechanical properties of engineering materials, as they can greatly influence the material behaviour. The research presented here is an experimental investigation to determine the effects of low temperatures and high strain rates on the compressive behaviour of concrete. The primary purpose of the research is the development of experimental stress–strain relationships under these conditions, as this is a largely unexplored research topic. Thirty-five 101.6 mm × 203.2 mm concrete cylinders were tested in uniaxial compression at the University of New Brunswick. The specimens were loaded either under static conditions or dynamically with an average strain rate of approximately 1 s−1, while being exposed to temperatures from 20°C to −70°C to simulate extreme climatic temperature and those attainable within industrial storage facilities. The compression strain of the specimens was obtained using digital image correlation. The mechanical properties studied were the compressive strength, strain associated with the peak stress and general stress–strain behaviour due to the increased strain rate and temperature variations.

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Section: Literature Reviewmentioning

confidence: 96%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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High strain rate and low temperature effects on the compressive behaviour of concrete

MacLean

Lloyd

2020

International Journal of Protective Structures

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“…Já no traço intermediário e pobre, à medida que a o GM diminuiu, a resistência também foi prejudicada. O comportamento de traços com maior consumo de cimento também se mostrou superior aos demais na pesquisa realizada por Yan et al [58], pelo fato dessa matriz ter uma robustez maior e proporcionar uma maior taxa de hidratação devido o teor de cimento.…”

Section: Resistência à Compressão Axialunclassified

Impacto nas propriedades mecânicas do concreto curado sob baixas temperaturas

et al. 2019

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RESUMO O processo de cura das matrizes cimentícias é muito importante na determinação das suas propriedades no estado endurecido. Nessas circunstâncias, o concreto pode sofrer sérias avarias quando exposto às severas variações térmicas. As baixas temperaturas de cura em que as matrizes cimentícias são expostas podem influenciar nas propriedades no estado endurecido, principalmente nas idades iniciais, prejudicando os processos de desfôrma e escoramento. Locais de frio intenso devem seguir procedimentos específicos de dosagem e aplicação de uma matriz cimentícia. Sendo assim, essa pesquisa objetivou analisar a influência da temperatura de cura no comportamento mecânico e físico de concretos em diversas temperaturas de cura, tanto nas idades inicias como nas mais avançadas. Observou-se que a diminuição na temperatura de cura proporcionou aumento de resistência em até 26% na idade de 28 dias nos concretos analisados, apesar de que apresentaram desenvolvimento lento das propriedades mecânicas nos 7 dias iniciais. Concretos com maior consumo de cimento apresentaram melhor desempenho nas idades inicias quando submetidos às temperaturas menores que 3 oC. Porém, percebeu-se que a cura em baixas temperaturas é capaz de proporcionar misturas mais íntegras em idades avançadas, visto que atingiram maior velocidade de propagação onda ultrassônica e resistência, pelo fato de ocorrer a hidratação residual do cimento.

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“…However, liquid ethane can reach extremely low temperatures well below 0 • C. In the case of unexpected leakages, part of the concrete surface in the foundation can be subjected to extremely low temperatures (up to −20 • C), which in turn can also lead to damage [8][9][10][11]. Previous research has shown that the strength of both concrete and reinforcement tends to increase when the temperature reduces within a particular range (e.g., 20 • C to −40 • C) [11][12][13][14][15]. This effect is particularly evident in moist concrete, where the increase in compressive strength has been attributed to the formation of ice which increases progressively as the temperature reduces [16].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of a Raft Concrete Foundation: A Case Study of a Leaking Ethane Tank

et al. 2022

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This article presents a case study on the thermal assessment of a reinforced concrete (RC) foundation exposed to low temperatures. The foundation supports a 19,500 m3-capacity tank with low-temperature (−89 °C) ethane. Icing and bubbling were observed on the tank’s surface soon after it started operations. Condensation was also observed at the bottom of the 0.8-m-depth RC slab, which raised concerns about the structural condition of the concrete. This study provides details of the field and analytical investigations conducted to assess the structural condition of the foundation. Heat transfer finite element (FE) analyses were performed to examine the concrete sections subjected to low temperatures. It was found that the ethane leakage produced a low temperature on the top side of the concrete foundation of +9.7 °C. Overall, the temperatures calculated by the FE analyses were in good agreement with actual field measurements, within a ±5% accuracy. The simplified heat transfer equation for porous media used in this study was sufficiently accurate to model the effects of the ethane leakage in the concrete foundation, provided that the ambient temperature at the site is taken into account in the analysis. The results also confirm that reinforcing bars can be neglected in the thermal analysis of massive concrete slabs. The results from the field measurements and FE analyses confirmed that the structural integrity of the RC foundation was never compromised. The approaches, methods and techniques discussed in this article are deemed suitable to solve the practical and scientific challenges involved in the thermal assessment and repairs of large special structures. Accordingly, they can serve as useful reference and guidance for engineers and practitioners working in the field of forensic engineering.

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Behaviours of reinforced concrete beams under low temperatures

Cited by 55 publications

References 12 publications

High strain rate and low temperature effects on the compressive behaviour of concrete

High strain rate and low temperature effects on the compressive behaviour of concrete

Impacto nas propriedades mecânicas do concreto curado sob baixas temperaturas

Thermal Analysis of a Raft Concrete Foundation: A Case Study of a Leaking Ethane Tank

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