Thermo-physical properties and transient heat transfer of concrete at elevated temperatures

Shin, Ki-Yeol; Kim, Sang-Baik; Kim, Jong-Hwan; Chung, Mo; Jung, Pyung-Suk

doi:10.1016/s0029-5493(01)00487-3

Cited by 118 publications

(52 citation statements)

References 4 publications

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“…where α is the thermal diffusivity, kthermal conductivity, density and C specific heat capacity.According to previous research, the thermal diffusivity of concrete has decreased with an increase intemperature except for the specific heat [7,15,16]. FIGURE 3 shows other studies on thermal diffusivity on various type of concrete.…”

Section: Thermal Diffusivitymentioning

confidence: 73%

“…These properties vary as a function of temperature and depend on the composition and characteristics of concrete.The thermal properties of the normal concrete [7], fly ash concrete [12], high strength concrete [12] and Eurocode concrete model [13] concrete were measured at high temperatures condition in the range of 20-800°C for both specific heat and thermal conductivity test.…”

Section: Research Significancementioning

confidence: 99%

“…Thermal properties are mainly determined by thermal conductivity, specific heat, thermal diffusivity, thermal expansion, and mass loss.Thermal conductivity is defined as the ratio of heat flow rate to the temperature gradient, and represents the uniform flow of heat through concrete of unit thickness over a unit area subjected to a unit temperature difference between the two opposite faces.The thermal conductivity value of normal concrete ranges from 0.62 to 3.3 W/m/K across more than five folds of magnitude depending on the types of coarse aggregate, moisture condition and temperature [4][5][6][7]. However, the lightweight insulating concrete with polystyrene bead or cellular lightweight concrete even exhibits the thermal conductivity of 0.07 to 0.33 W/m/K [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Review on thermal insulation performance in various type of concrete

Shahedan¹,

Mahmed²,

Kusbiantoro³

et al. 2017

AIP Conference Proceedings

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Abstract. Thermal insulation concrete building plays an important role in environment sustainability especially energy saving buildings. Buildings are one of the largest consumers of energy worldwide. Therefore, significant energy saving can be realized by buildings with proper materials, design and operation. Thermal insulation systems are nowadays mostly applied for such building envelopes where the materials of load bearing structure such as concrete do not have a substantial thermal insulation capability. Thermal insulation in concrete are materials or combinations of materials that are used to provide resistance to heat flow, should have low conductivity for building application in order to represence of a temperature gradient, has an important effect on the heat exchange between the building interior and the ambiance.The aim of this paper is to review the thermal properties include thermal conductivity and specific heat on various types of concrete.

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Section: Thermal Diffusivitymentioning

confidence: 73%

Section: Research Significancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Review on thermal insulation performance in various type of concrete

Shahedan¹,

Mahmed²,

Kusbiantoro³

et al. 2017

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Therefore, the COVs of f y and f c ' at elevated temperatures is taken as that at ambient temperature. For high temperature analysis, thermal diffusivity α, is also considered as an RV, with COV taken from Shin et al (2002). Thermal diffusivity is given as:…”

Section: Resistance Modelmentioning

confidence: 99%

“…For compressive blocks exposed to fire from the sides of the section, using the Wickstrom model, it is given by the following, measured from the outer edge of the An important factor in Wickstrom's model is the thermal diffusivity ratio α r . It is known that α r changes based on density, aggregate type, temperature, and other factors (Morabito 1989;Shin et al 2002;Bentz et al 2011;Purkiss 2007, Van Green et al 1997. Increasing α r results in faster heat transfer through the section, and a decrease in time to failure.…”

Section: Resistance Modelmentioning

confidence: 99%

Reliability Analysis of RC Beams Exposed to Fire

Eamon

Jensen

2013

J. Struct. Eng.

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A procedure for conducting reliability analysis of reinforced concrete beams subjected to a fire load is presented. This involves identifying relevant load combinations, specifying critical load and resistance random variables, and establishing a high-temperature performance model for beam capacity. Based on the procedure, an initial reliability analysis is conducted using currently available data. Significant load random variables are taken to be dead load, sustained live load, and fire temperature. Resistance is in terms of moment capacity, with random variables taken as steel yield strength, concrete compressive strength, placement of reinforcement, beam width, and thermal diffusivity. A semi-empirical model is used to estimate beam moment capacity as a function of fire exposure time, which is calibrated to experimental data available in the literature.The effect of various beam parameters were considered, including cover, beam width, aggregate type, compressive strength, dead to live load ratio, reinforcement ratio, support conditions, mean fire temperature, and other parameters. Using the suggested procedure, reliability was estimated from zero to four hours of fire exposure using Monte Carlo simulation. It was found that reliability decreased nonlinearly as a function of time, while the most significant parameters were concrete cover; span/depth ratio when axial restraints are present, mean fire temperature; and support conditions.

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Experimental and numerical analysis of the thermal and mechanical behaviour of steel and recycled aggregate concrete composite elements exposed to fire

et al. 2022

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Using recycled aggregates in the production of concrete has been a viable alternative for sustainable development. Notwithstanding advanced information on this material at room temperature, its behavior when exposed to fire is still incipient. Thus, based on experimental analyses, the objective of this article is to evaluate the behavior of concrete produced with recycled aggregates for thermal insulation of steel elements, as well as to verify the physical and mechanical properties of these mixtures. For this purpose, eight prototypes, one made of steel and the others coated with different types of concrete, conventional and with recycled aggregates, were inserted in a horizontal oven and heated for 2 h. Based on experimental tests, numerical models were proposed and tested using the ABAQUS computational code, with consistent results when coherent thermal properties were adopted. The experimental results show that recycled aggregate concrete (RAC) has great thermal insulation potential and sustainable benefits, considering that the steel elements coated with this type of material, with the exception of those that underwent spalling, presented temperatures close to or below compared with concrete with natural aggregates. In this regard, it is observed that the thermal conductivity of RACs was inferior to conventional concrete, indicating that this material is a promising strategy for thermal insulation of steel structures.

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Thermo-physical properties and transient heat transfer of concrete at elevated temperatures

Cited by 118 publications

References 4 publications

Review on thermal insulation performance in various type of concrete

Review on thermal insulation performance in various type of concrete

Reliability Analysis of RC Beams Exposed to Fire

Experimental and numerical analysis of the thermal and mechanical behaviour of steel and recycled aggregate concrete composite elements exposed to fire

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