dc.contributor.author | Rodriguez-Blanco, Juan | |
dc.date.accessioned | 2022-01-17T09:15:12Z | |
dc.date.available | 2022-01-17T09:15:12Z | |
dc.date.issued | 2021 | |
dc.date.submitted | 2021 | en |
dc.identifier.citation | González-Santamaría, D.E., Justel A., Fernández, R., Ruiz, A.I., Stavropoulou, A., Rodriguez-Blanco, J.D., Cuevas, A., SEM-EDX study of bentonite alteration under the influence of cement alkaline solutions., Applied Clay Science, 212, 2021, 10622- | en |
dc.identifier.other | Y | |
dc.identifier.uri | http://hdl.handle.net/2262/97903 | |
dc.description | PUBLISHED | en |
dc.description.abstract | Bentonite is a key barrier for the isolation of high-level radioactive waste within Deep Geological Repository. However, bentonite may be altered by contact with cementitious materials and their alkaline pore fluids. This study offers an extensive morphological and semi-quantitative characterization of the bentonite surface exposed to three types of alkaline pore fluids released by different cement-based materials. The bentonite surfaces were studied using a thorough scanning electron microscopy exploration and analysed using an energy-dispersive X-ray detector (SEM-EDX). In addition, statistical, element mappings, X-ray diffraction and infrared spectroscopy analyses were performed. The aim was to have a picture of the morphological and chemical alterations of bentonite at very early stages in accordance with the integrated approach necessary to address bentonite stability in the long-term. As a consequence of the reactivity, two types of morphologies stood out in the matrix of bentonite: platelets and coatings-like crusts characterized by their high Mg and Ca content. These alterations presented a different scope depending on the type of alkaline pore solution involved and suggested the precipitation of authigenic magnesium silicate hydrates (M-S-H) and/or trioctahedral clay minerals and Ca‑carbonates. The knowledge of the performance of bentonite subjected to these alkaline solutions can help in the evaluation of the most suitable cement-based materials to be used next to bentonite. | en |
dc.format.extent | 10622 | en |
dc.language.iso | en | en |
dc.relation.ispartofseries | Applied Clay Science; | |
dc.relation.ispartofseries | 212; | |
dc.rights | Y | en |
dc.subject | Bentonite | en |
dc.subject | Alkaline perturbation | en |
dc.subject | SEM-EDX | en |
dc.subject | Cement | en |
dc.subject | Engineered barrier system | en |
dc.title | SEM-EDX study of bentonite alteration under the influence of cement alkaline solutions. | en |
dc.type | Journal Article | en |
dc.type.supercollection | scholarly_publications | en |
dc.type.supercollection | refereed_publications | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/rodrigjd | |
dc.identifier.rssinternalid | 236584 | |
dc.identifier.doi | 10.1016/j.clay.2021.106223 | |
dc.rights.ecaccessrights | openAccess | |
dc.subject.TCDTheme | Nanoscience & Materials | en |
dc.subject.TCDTheme | Smart & Sustainable Planet | en |
dc.subject.TCDTag | Nuclear Safety | en |
dc.subject.TCDTag | cements | en |
dc.subject.TCDTag | mineral-water interaction | en |
dc.identifier.orcid_id | 0000-0001-5978-3001 | |
dc.status.accessible | N | en |