On Concrete Properties during Heating and Cooling.

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Bibliographic Details
Title:	On Concrete Properties during Heating and Cooling.
Authors:	Bamonte, Patrick¹, Robert, Fabienne², Gernay, Thomas³
Source:	ACI Materials Journal. Nov2025, Vol. 122 Issue 6, p5-15. 11p.
Subjects:	Thermal diffusivity, Compressive strength, Thermal properties, Flame temperature, Reinforced concrete, Thermocycling, Temperature effect, Mechanical behavior of materials
Abstract:	The use of parametric/natural fires in the design of reinforced concrete structures in fire conditions requires an accurate definition of the temperature-induced evolution of the thermal and mechanical properties. Within this context, the characterization of four normal-strength concretes (fc20 = 4200 to 6800 psi [29 to 47 MPa]), with siliceous and carbonate aggregates, are studied herein concerning the thermal diffusivity D (between 68 and 1652°F [20 and 900°C]) and under uniaxial compression after different thermal cycles, with reference maximum temperatures of 392, 752, and 1112°F (200, 400, and 600°C). The results show that thermal diffusivity exhibits mostly irreversible behavior after exposure to temperatures over 1382°F (750°C). Concerning the compressive strength, the hot and residual values (when Ttest = 68°F [20°C]) are, overall, in line with the most common standard provisions. Quite interestingly, the tests carried out at intermediate temperatures (with Ttest ≠ Tmax and Ttest > 68°F [20°C]) highlighted a strength decay, which is not simply an interpolation between hot and residual values. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	The use of parametric/natural fires in the design of reinforced concrete structures in fire conditions requires an accurate definition of the temperature-induced evolution of the thermal and mechanical properties. Within this context, the characterization of four normal-strength concretes (fc20 = 4200 to 6800 psi [29 to 47 MPa]), with siliceous and carbonate aggregates, are studied herein concerning the thermal diffusivity D (between 68 and 1652°F [20 and 900°C]) and under uniaxial compression after different thermal cycles, with reference maximum temperatures of 392, 752, and 1112°F (200, 400, and 600°C). The results show that thermal diffusivity exhibits mostly irreversible behavior after exposure to temperatures over 1382°F (750°C). Concerning the compressive strength, the hot and residual values (when Ttest = 68°F [20°C]) are, overall, in line with the most common standard provisions. Quite interestingly, the tests carried out at intermediate temperatures (with Ttest ≠ Tmax and Ttest > 68°F [20°C]) highlighted a strength decay, which is not simply an interpolation between hot and residual values. [ABSTRACT FROM AUTHOR]
ISSN:	0889325X
DOI:	10.14359/51749132