Heat and Mass Transfer Model for Fire-Exposed Concrete — Part B : Validation of Mass Loss and Temperature Predictions
Loading...
Access rights
openAccess
CC BY
CC BY
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Date
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
23
Series
International Journal of Concrete Structures and Materials, Volume 19, issue 1
Abstract
Explosive spalling of concrete is an essential phenomenon to be accounted for when analyzing the fire performance of concrete structures. Existing tools of fire simulation can provide the fire exposure on concrete surface, and to some extent, conjugate heat transfer too, but new tools are needed for modelling the concrete high-temperature reactions coupled with heat and mass transfer. In this second part of the two-part article, we characterize two concrete mixtures regarding their high-temperature reactions using TGA and DSC experiments and measure their porosities, permeabilities, and thermal conductivities. We measure sample temperatures and mass loss under radiative heating in two different scales and at two different moisture levels. The experimental data is then used to validate the numerical model with a kinetics-driven evaporation rate. The model predicts mass loss with mean absolute percentage error (MAPE) typically ≤0.3 % and ≤1.9 % in the worst case. For temperature increase, typical MAPE ≤15 % and maximum MAPE ≤25 %. The model bias and relative standard deviation are +8.4 % and 3.7 % for mass loss, and +5.0 % and 4.4 % for temperature. We then introduce an improved version of the model with pressure-constrained evaporation rate. The model improves the pore pressure predictions, but maintaining the accuracy of mass loss and temperature predictions would require re-calibration of the kinetic parameters. A sensitivity study is used to identify future topics of model improvement and data gathering.Description
Publisher Copyright: © The Author(s) 2025.
Other note
Citation
Riitamaa, C, Hostikka, S, Markert, F, Husted, B P, Bhargava, A, Patil, N, Li, K, Wu, X & Deng, X 2025, 'Heat and Mass Transfer Model for Fire-Exposed Concrete — Part B : Validation of Mass Loss and Temperature Predictions', International Journal of Concrete Structures and Materials, vol. 19, no. 1, 127. https://doi.org/10.1186/s40069-025-00860-7