Reactive transport models of the geochemical interactions at the iron/bentonite interface in laboratory corrosion tests
Entity
UAM. Departamento de Geología y GeoquímicaPublisher
ElsevierDate
2023-08-01Citation
10.1016/j.clay.2023.106981
Applied Clay Science 240 (2023): 106981
ISSN
0169-1317 (print); 1872-9053 (online)DOI
10.1016/j.clay.2023.106981Funded by
The research leading to these results was funded by ENRESA within the Work Package ACED of EURAD (European Joint Programme on Radioactive Waste Management of the European Union, grant agreement nº 847593), the Spanish Ministry of Science and Innovation (PID2019-109544RB-I00) and the Galician Regional Government (Grant ED431C2021/54). The comments and corrections of the special editor and the two anonymous reviewers are greatly appreciatedProject
info:eu-repo/grantAgreement/EC/H2020/847593/EU//EURAD; Gobierno de España. PID2019-109544RB-I00Editor's Version
https://doi.org/10.1016/j.clay.2023.106981Subjects
Geological Repositories; Iron; Magnetite; Radioactivity; Steel Corrosion; Geología; QuímicaRights
© 2023 The AuthorsEsta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
Carbon steel and compacted bentonite have been proposed as candidate materials for the overpack and buffer, respectively, of the multi-barrier system of a geological high-level radioactive waste repository. Carbon steel corrosion may impair bentonite properties. The interactions of corrosion products and bentonite are analyzed with laboratory corrosion tests. Here coupled thermo-hydro-chemical-mechanical (THCM) models of two types of heating and hydration tests performed on compacted bentonite in contact with Fe powder are presented to study the iron-bentonite interactions at representative repository conditions. Tests on small cells (SC) were performed under unsaturated non-isothermal conditions in 25 mm long columns containing 21 mm of bentonite and 4 mm of Fe powder. Tests on medium-size cells (FB) were performed under unsaturated non-isothermal conditions in 99.8 mm long columns containing 86.8 mm of bentonite and 13 mm of Fe powder. Model results for the SC tests showed that magnetite and Fe(OH)2(s) were the main corrosion products which compete for Fe2+ precipitation. Computed corrosion products precipitate mainly in the Fe powder, penetrate a few mm into the bentonite and reproduce the measured iron weight data. Model results of the FB tests showed that magnetite precipitates throughout the Fe powder interface and reproduce the main trends of the corrosion products. Model results of these corrosion tests will be of great relevance for the performance assessment of engineered barriers of radioactive waste repositories
Files in this item
Google Scholar:Mon, Alba
-
Samper, Javier
-
Montenegro, Luis
-
Turrero, María Jesús
-
Torres, Elena
-
Cuevas Rodríguez, Jaime Fernando
-
Fernández Martín, Raúl
-
Windt, Laurent de
This item appears in the following Collection(s)
Related items
Showing items related by title, author, creator and subject.