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Ferrari, A. |
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Schimpf, Christian |
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Dunser, M. |
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Thomas, Eric |
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Gecse, Zoltan |
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Tsrunchev, Peter |
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Della Ricca, Giuseppe |
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Cios, Grzegorz |
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Hohlmann, Marcus |
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Dudarev, A. |
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Mascagna, V. |
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Santimaria, Marco |
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Poudyal, Nabin |
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Piozzi, Antonella |
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Mørtsell, Eva Anne |
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Jin, S. |
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Noel, Cédric |
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Fino, Paolo |
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Mailley, Pascal |
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Meyer, Ernst |
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Zhang, Qi |
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Pfattner, Raphael | Brussels |
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Kooi, Bart J. |
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Babuji, Adara |
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Pauporte, Thierry |
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Han, S.
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Topics
Publications (8/8 displayed)
- 2023Search for heavy, long-lived, charged particles with large ionisation energy loss in $pp$ collisions at $%5Csqrt{s} = 13~%5Ctext{TeV}$ using the ATLAS experiment and the full Run 2 datasetcitations
- 2023Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 TeV
- 2021Adaptive radar detection in the presence of multiple alternative hypotheses using kullback-leibler information criterion-part II: Applicationscitations
- 2021Modeling detrimental effects of high surface roughness on the fatigue behavior of additively manufactured Ti-6Al-4V alloyscitations
- 2021Sorption of beryllium in cementitious systems relevant for nuclear waste disposal: Quantitative description and mechanistic understandingcitations
- 2019Beam test results of NDL Low Gain Avalanche Detectors (LGAD)citations
- 2017Experimental observation of the self-healing microcapsules containing rejuvenator states in asphalt bindercitations
- 2016Fabrication and characterization of self-healing microcapsules containing bituminous rejuvenator by a nano-inorganic/organic hybrid methodcitations
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article
Sorption of beryllium in cementitious systems relevant for nuclear waste disposal: Quantitative description and mechanistic understanding
Abstract
International audience ; Beryllium has applications in fission and fusion reactors, and it is present in specific streams of radioactive waste. Accordingly, the environmental mobility of beryllium needs to be assessed in the context of repositories for nuclear waste. Although cement is widely used in these facilities, Be(II) uptake by cementitious materials was not previously investigated and was hence assumed negligible.Sorption experiments were performed under Ar-atmosphere. Ordinary Portland cement, low pH cement, calcium silicate hydrated (C–S–H) phases and the model system TiO2 were investigated. Sorption kinetics, sorption isotherms and distribution ratios (Rd, in kg⋅L−1) were determined for these systems. Molecular dynamics were used to characterize the surface processes driving Be(II) uptake.A strong uptake (5 ≤ log Rd ≤ 7) is quantified for all investigated cementitious systems. Linear sorption isotherms are observed over three orders of magnitude in [Be(II)]aq, confirming that the uptake is controlled by sorption processes and that solubility phenomena is not relevant within the investigated conditions. The analogous behaviour observed for cement and C–S–H support that the latter are the main sink of beryllium. The two step sorption kinetics is explained by a fast surface complexation process, followed by the slow incorporation of Be(II) in C–S–H. Molecular dynamics indicate that Be(OH)3– and Be(OH)42− are sorbed to the C–S–H surface through Ca-bridges.This work provides a comprehensive quantitative and mechanistic description of Be(II) uptake by cementitious materials, whose retention properties can be now reliably assessed for a wide range of boundary conditions of relevance in nuclear waste disposal.