Behavior of centrifuged concrete in case of fire

Authors

  • Ivan I. Polevoda State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus
  • Denis S. Nekhan' State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus
  • Dmitriy S. Batan Open Joint Stock Company «Svetlogorsk Plant of Concrete Products and Structures»; ul. Miroshnichenko, 25, Svetlogorsk, 247400, Belarus

DOI:

https://doi.org/10.33408/2519-237X.2018.2-4.455

Keywords:

strength, fire resistance, high-temperature heating, coefficient of concrete working conditions in case of fire, centrifuged concrete, anisotropy (heterogeneity), relative thickness, strength reduction factor

Abstract

Purpose. The article is devoted to the change in the strength of centrifuged concrete during heating.

Methods. Strength test of centrifuged concrete samples after high temperature heating.

Findings. The results of experimental and theoretical studies of the resistance of centrifuged concrete to high temperatures are presented. Empirical dependences of kс(θ) of centrifuged concrete were obtained. The values of the correction factor for estimating the kс(θ) of centrifuged concrete were obtained.

Application field of research. The results of the study can be used to determine the residual strength of concrete in structures made by centrifuging under high-temperature heating (in the event of a fire), as well as during engineering assessment of kс(θ) under current regulations.

Conclusions. The changes in the physical and mechanical properties of centrifuged concrete in a fire have been generalized, which are recommended to take into account by the corresponding coefficients of concrete working conditions at a fire. The dependence of the strength characteristics of centrifuged concrete on the location in the structure was determined experimentally and theoretically confirmed. Nomograms have been obtained that make it possible to determine the value of kc for heavy concrete at any point in a centrifuged reinforced concrete structure at temperatures up to 800°C. Based on the experimental data, the coefficient kс(θ) of centrifuged concrete for the first time is mathematically described as a function of temperature θ, the relative thickness of the structure δ, and the rate of change of kс(θ) over the cross-section tanφ. At the same time, to estimate kс(θ), empirical coefficients were obtained, characterizing the intensity of destructive processes, associated with an increase in temperature and non-homogeneity in the cross section. The values of the correction factor kcor for assessing the coefficient of working conditions of centrifuged concrete in case of fire under the current technical regulatory legal acts are obtained.

Author Biographies

Ivan I. Polevoda, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus

Head of University; PhD in Technical Sciences, Associate Professor

Denis S. Nekhan', State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus

Cadet

Dmitriy S. Batan, Open Joint Stock Company «Svetlogorsk Plant of Concrete Products and Structures»; ul. Miroshnichenko, 25, Svetlogorsk, 247400, Belarus

Senior Engineer

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Published

2018-11-27

How to Cite

Polevoda И., Nekhan’ Д. С. and Batan Д. (2018) “Behavior of centrifuged concrete in case of fire”, Journal of Civil Protection, 2(4), pp. 455–469. doi: 10.33408/2519-237X.2018.2-4.455.

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