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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