Production of H2 by water radiolysis in cement paste under electron irradiation: A joint experimental and theoretical study

Abstract : Long-term confinement of nuclear waste is one of the main challenges faced by the nuclear industry. Fission products such as 90 Sr and 137 Cs, both β − emitters known to induce serious health hazards, represent the largest fraction of nuclear waste. Cement is a good candidate to store them, provided it can resist the effects of irradiation over time. Here, we have investigated the effects of β − decay on cement by performing electron irradiation experiments on different samples. We show that H 2 production in cement, the main effect of water radiolysis, depends strongly on composition and relative humidity. First-principles calculations indicate that the water-rich interlayer regions with Ca 2+ ions act as electron traps that promote the formation of H 2. They also show that holes localize in water-rich regions in low Ca content samples and are then able to participate in H 2 production. This work provides new understanding of radiolysis effects in cements.
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https://hal-cea.archives-ouvertes.fr/cea-01543011
Contributeur : Serge Palacin <>
Soumis le : mardi 20 juin 2017 - 13:37:13
Dernière modification le : jeudi 18 janvier 2018 - 01:28:18

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Sophie Le Caër, Lucile Dezerald, Khaoula Boukari, Maxime Lainé, Sébastien Taupin, et al.. Production of H2 by water radiolysis in cement paste under electron irradiation: A joint experimental and theoretical study. Cement and Concrete Research, Elsevier, 2017, 100, pp.110 - 118. 〈http://www.sciencedirect.com/science/article/pii/S0008884617302065〉. 〈10.1016/j.cemconres.2017.05.022〉. 〈cea-01543011〉

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