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Lookup NU author(s): Dr Colin DavieORCiD, Dr Jiayi Wang
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© The Author(s), under exclusive licence to RILEM 2025.Modeling concrete at elevated temperatures is essential to understanding the behavior of structural elements during fire, particularly with respect to spalling. To accurately predict temperatures and pore pressures, models must be validated against experimental data. However, most models in the literature focus on replicating experimental outcomes and often rely on input parameters sourced from the literature or determined by empirical tuning. To explore this further, a study of five models was conducted as part of the activities of the RILEM Technical Committee 256-SPF. On the theoretical side, state-of-the-art formulations are reviewed and similarities and differences between implementations are discussed. Using input parameters from various test reports, simulations of temperatures and pore pressures were performed and compared with test results for two types of concrete. While all of the models gave satisfactory results, they did so only when permeability values were applied that were significantly lower than those obtained from the standard tests. Since this trend was consistent across all models, it suggests that the permeability of concrete under heating conditions differs from that measured in standard material tests. As noted by some researchers, gas permeability in concrete is altered by the presence of water, probably due to swelling and rehydration. Identifying an accurate permeability value for these conditions remains an open research challenge.
Author(s): Weber B, Davie CT, Millard A, Wang J, Dauti D, Zhang Y, Mindeguia J-C, Zeiml M, Dal Pont S, Pesavento F
Publication type: Article
Publication status: Published
Journal: Materials and Structures/Materiaux et Constructions
Year: 2025
Volume: 58
Issue: 2
Print publication date: 01/03/2025
Online publication date: 08/02/2025
Acceptance date: 18/11/2024
ISSN (print): 1359-5997
ISSN (electronic): 1871-6873
Publisher: Springer Science and Business Media B.V.
URL: https://doi.org/10.1617/s11527-024-02532-6
DOI: 10.1617/s11527-024-02532-6
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