Effect of Temperature on Thermal Properties of High-Strength Concrete

Kodur, Venkatesh; Sultan, M. A.

doi:10.1061/(asce)0899-1561(2003)15:2(101)

Cited by 238 publications

(151 citation statements)

References 7 publications

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“…For high strength concrete, the thermal properties proposed by Kodur and Sultan [18] were implemented, since they proved to fit closely the test data.…”

Section: A) Concretementioning

confidence: 99%

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Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Ibáñez

Aguado

Romero

et al. 2015

Fire Safety Journal

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Ibañez C, Aguado JV, Romero ML, Espinos A, Hospitaler A. Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section. Fire Safety Journal. 2015; 78:10-23. doi: 10.1016/j.firesaf.2015 ABSTRACTIn this work, a method for a realistic cross-sectional temperature prediction and a simplified fire design method for circular concrete filled tubular columns under axial load are presented. The generalized lack of simple proposals for computing the crosssectional temperature field of CFT columns when their fire resistance is evaluated is evident. Even Eurocode 4 Part 1-2, which provides one of the most used fire design methods for composite columns, does not give any indications to the designers for computing the cross-sectional temperatures. Given the clear necessity of having an available method for that purpose, in this paper a set of equations for computing the temperature distribution of circular CFT columns filled with normal strength concrete is provided. First, a finite differences thermal model is presented and satisfactorily validated against experimental results for any type of concrete infill. This model considers the gap at steel-concrete interface, the moisture content in concrete and the Ibañez C, Aguado JV, Romero ML, Espinos A, Hospitaler A. Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section. Fire Safety Journal. 2015; 78:10-23. doi: 10.1016/j.firesaf.2015 2 temperature dependent properties of both materials. Using this model, a thermal parametric analysis is executed and from the corresponding statistical analysis of the data generated, the practical expressions are derived. The second part of the paper deals with the development of a fire design method for axially loaded CFT columns based on the general rules stablished in Eurocode 4 Part 1-1 and employing the concept of room temperature equivalent concrete core cross-section. In order to propose simple equations, a multiple nonlinear regression analysis is made with the numerical results generated through a thermo-mechanical parametric analysis. Once more, predicted results are compared to experimental values giving a reasonable accuracy and slightly safe results.

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“…For high strength concrete, the thermal properties proposed by Kodur and Sultan [18] were implemented, since they proved to fit closely the test data.…”

Section: A) Concretementioning

confidence: 99%

“…For specimens with steel fiber reinforced high strength concrete as infill, the relationships for thermal properties at high temperature presented by Kodur and Sultan [18] were adopted.…”

Section: B) Steel Fiber Reinforced Concretementioning

confidence: 99%

Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Ibáñez

Aguado

Romero

et al. 2015

Fire Safety Journal

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“…The equations that calculate of the specific heat capacity and thermal conductivity with temperature for concrete containing siliceous were taken from Kodur and Sultan [36]. The density of the concrete block (2375 kg/m 3 ) was specified in the material properties.…”

Section: Electromagnetic Modellingmentioning

confidence: 99%

“…Using thermodynamic properties from the literature [36], dielectric property measurements and the results from the simulation of the power density, the temperature evolved 6.5mm below the surface of the whinstone concrete was derived after 60s of treatment at 15kW and a standoff distance of 50mm.…”

mentioning

confidence: 99%

Understanding the scabbling of concrete using microwave energy

Buttress¹,

Jones²,

Dodds³

et al. 2015

Cement and Concrete Research

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This paper reports on the use of microwave energy to scabble concrete. While the technique is not new, little information exists relating to the controllability of the process, the effect of different types of concrete and the performance and durability of the scabbled concrete post treatment. Concrete blocks supplied by the UK Sellafield nuclear site were treated with microwave energy using a 15kW system, operating at 2.45GHz. The effect of aggregate type (Whinstone, Gravel and Limestone); standoff distance; and effect of surface coating were studied to determine their influence on the systems performance, in terms of mass and area removal rates.Complimentary modelling studies were undertaken relating the power density of the microwave energy to observed scabbling profile. Mass and area removal rates averaged 11.3gs -1 and 3cms -1 respectively on treating large areas to a depth of 25mm. The process was shown to not adversely affect structural properties of the specimens after treatment.

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“…Thus, a statistical approach based on a large amount of data from various experiments is required (Abrams 1971;Diederichs et al1988;Kodur et al 2003;Cheng et al 2004;Hertz 2005;Hirashima et al 2007; Kim et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Concrete depending on Cooling Conditions After High Temperature Heating

Kim

Choe

Kang

et al. 2014

ACT

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Since the 1960's, various studies have been carried out on the internal and external factors that might affect heated concrete in terms of compressive strength, elastic modulus and thermal stress. In particular, thermal properties of aggregate and cooling methods are known to have a significant influence on concrete residual mechanical properties. This study aims to assess concrete mechanical properties based on the types of aggregate and cooling methods used. The used coarse aggregate in concrete was granite, ash-clay and clay type. The circular concrete specimens of Ø100×200mm used in the experiment were heated to the target temperature to test the mechanical properties at a high temperature, slow cooling (room temperature) and water cooling (quenching) conditions. In conclusion, the research finding reveals that the smaller the thermal expansion of the aggregate, the higher the strain at a high temperature while the more deteriorated the mechanical characters. In addition, the lightweight aggregate concrete was greatly affected by the cooling velocity although the thermal expansion strain of aggregates as the thermal expansion of aggregates took place to a smaller extent, the strength at high temperature remained, while the mechanical properties deteriorated with cooling accelerated. In addition, light-weight aggregate concrete which ash-clay and clay aggregates is greatly affected by the cooling velocity depending on aggregate although the thermal expansion strain of the aggregates was shown to be within a similar range.

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Effect of Temperature on Thermal Properties of High-Strength Concrete

Cited by 238 publications

References 7 publications

Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Fire design method for concrete filled tubular columns based on equivalent concrete core cross-section

Understanding the scabbling of concrete using microwave energy

Mechanical Properties of Concrete depending on Cooling Conditions After High Temperature Heating

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