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How mobile is tritiated water through unsaturated cement-based materials? New insights from two complementary approaches

Abstract : This work presents two complementary approaches (for low and high desaturation) to study tritiated water (HTO) diffusion through unsaturated cement-based materials. The first approach was based on through-diffusion experiments where suction was controlled by osmosis. In the second approach, diffusion experiments were performed in humidity chambers controlled by under-saturated saline solutions. Results revealed a decrease of effective diffusion coefficient by a factor of 10 from 100% to 23% of saturation degree. Comparison with gaseous H$_2$ suggests that HTO diffuses through unsaturated cement-based materials at rates 4 orders of magnitude lower.
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S. Savoye, A. Rajyaguru, N. Mace, S. Lefevre, G. Spir, et al.. How mobile is tritiated water through unsaturated cement-based materials? New insights from two complementary approaches. Applied Radiation and Isotopes, Elsevier, 2017, 139, pp.98-106. ⟨10.1016/j.apradiso.2018.04.019⟩. ⟨cea-02421724⟩

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