Modelling of the evolving contributions of gas transport, cracks and chemical kinetics during atmospheric carbonation of hydrated C3S and C-S-H pastes
| Autor: | Seigneur, Nicolas, de Windt, Laurent, Poyet, Stéphane, Socié, Adrien, Dauzeres, Alexandre |
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| Přispěvatelé: | Centre de Géosciences (GEOSCIENCES), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), CEA- Saclay (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire d'étude et de recherche sur les transferts et les interactions dans les sous-sols (IRSN/PSE-ENV/SEDRE/LETIS), Service des déchets radioactifs et des transferts dans la géosphère (IRSN/PSE-ENV/SEDRE), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN) |
| Rok vydání: | 2022 |
| Předmět: |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
[CHIM.ANAL]Chemical Sciences/Analytical chemistry [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment General Materials Science Building and Construction [INFO.INFO-NA]Computer Science [cs]/Numerical Analysis [cs.NA] [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation [SDE.ES]Environmental Sciences/Environmental and Society [SPI.MAT]Engineering Sciences [physics]/Materials |
| Zdroj: | Cement and Concrete Research Cement and Concrete Research, 2022, 160, pp.106906. ⟨10.1016/j.cemconres.2022.106906⟩ |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2022.106906 |
| Popis: | International audience; This modelling study investigated the physicochemical and kinetic controls of the mineralogical evolutions of cementitious materials subject to accelerated atmospheric carbonation. Simulations are based on published experimental results on two samples, a hydrated C3S and a C-S-H paste, carbonated for 1 year at 55 % RH at 3 % CO2. For the C3S paste, reactive transport simulations accurately reproduced the mineralogical observations at different time intervals. However, for the C-S-H paste, in which significant cracks appeared, basis simulations could not reproduce the long-term carbonation extent. 2D simulations suggested that potential preexisting cracks could not fully explain the seemingly increasing carbonation rates. A final simulation using a simplified description of the crack appearance during carbonation gave the most accurate representation of the experimental results (degradation depths, mineralogy evolution). This demonstrates that, to accurately estimate the durability of cementitious materials subject to carbonation under dry conditions, coupled geochemical-mechanical descriptions are required. |
| Databáze: | OpenAIRE |
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