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On Concrete Properties during Heating and Cooling.

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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]
Copyright of ACI Materials Journal is the property of American Concrete Institute and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: 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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  Data: <i>Copyright of ACI Materials Journal is the property of American Concrete Institute and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.14359/51749132
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      – Code: eng
        Text: English
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        PageCount: 11
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      – SubjectFull: Thermal diffusivity
        Type: general
      – SubjectFull: Compressive strength
        Type: general
      – SubjectFull: Thermal properties
        Type: general
      – SubjectFull: Flame temperature
        Type: general
      – SubjectFull: Reinforced concrete
        Type: general
      – SubjectFull: Thermocycling
        Type: general
      – SubjectFull: Temperature effect
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      – SubjectFull: Mechanical behavior of materials
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      – TitleFull: On Concrete Properties during Heating and Cooling.
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              M: 11
              Text: Nov2025
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              Y: 2025
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