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Effect of sodium nitrate on radiolytic gas production of Portland based materials containing blast furnace slag

Abstract : Arising from spent fuel reprocessing or national defence, nitrates are often encountered in nuclear waste such as decontamination slurries and concentrates. As this kind of waste is often conditioned by solidification in cement-based materials, it is of interest to assess its effect on the radiolytic gas production of cemented wasteforms. Indeed, nitrates are known to have a significant effect on water radiolysis and cement-based materials contain water, both as free water in the porosity and bound water of the hydrates (calcium silicate hydrates for instance). Water of cement-based materials is known to produce H2 under irradiation emitted by the waste and previous works report H2 production drop when nitrates are present in the mixing water. The aim of the present work is to focus on the effect of sodium nitrates on gas production of cement-based materials made of Portland cement with or without addition of blast furnace slag. Indeed, Portland cement is widely used to perform the solid-ification of nuclear waste and its partial substitution by blast furnace slag is relevant to decrease hy-dration heat or to improve compatibility with waste such as ion exchange resins.
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https://hal-cea.archives-ouvertes.fr/cea-03773977
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Submitted on : Friday, September 23, 2022 - 11:20:43 AM
Last modification on : Wednesday, September 28, 2022 - 4:44:25 AM

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  • HAL Id : cea-03773977, version 1

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David Chartier, Jennifer Sanchez-Canet, Laetitia Bessette, Stéphane Esnouf, Jean-Philippe Renault, et al.. Effect of sodium nitrate on radiolytic gas production of Portland based materials containing blast furnace slag. NUWCEM 2022 - 4th International Symposium on Cement-Based Materials for Nuclear Wastes, May 2022, Avignon, France. ⟨cea-03773977⟩

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