Influence of cooling methods on the residual mechanical behavior of fire-exposed concrete : an experimental study.
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Date
2019
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Abstract
This work reports the main conclusions of a study on the mechanical behavior of concrete
under ISO 834 fire with different cooling methods. The aim of this research was to provide reliable
data for the analysis of structures damaged by fire. The experimental program used cylindrical
concrete test specimens subjected to ISO 834 heating in a furnace up to maximum gas temperatures
of 400, 500, 600, 700, and 800 ◦C. The compressive strength was measured in three situations: (a) at
the different temperature levels reached in the furnace; (b) after a natural cooling process; and (c)
after aspersion with water at ambient temperature. The results indicate that the concrete residual
compressive strength is fairly dependent on the maximum temperature reached in the furnace and
revealed that concrete of a lower strength preserved relatively higher levels of strength. The cooling
method significantly influenced the strength, albeit at a lower intensity. In all cases, the residual
strength remained in the range of 38% to 67% of the strength at ambient temperature. The statistical
analysis showed that the data obtained by the experimental program are significant and confirmed
the influence of the conditions imposed on the residual strength.
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Keywords
Concrete fire degradation
Citation
CARVALHO, E. F. T. de et al. Influence of cooling methods on the residual mechanical behavior of fire-exposed concrete: an experimental study. Materials, v. 12, 2019. Disponível em: <https://www.mdpi.com/1996-1944/12/21/3512>. Acesso em: 29 abr. 2022.