Speaker
Description
Gas production is expected in radioactive-waste disposal structures as a result of metal corrosion, leading to a slow increase in gas pressure within engineered barriers. It is essential to investigate gas migration mechanisms at low pressures. In this study, gas permeability and gas diffusion coefficients of an industrial concrete considered for radioactive-waste repository were measured. Diffusion tests were conducted on dry samples using a dedicated experimental device, and diffusion coefficients were directly determined with the use of Fick’s first law. The relative contributions of diffusion- and permeation-driven gas flow were evaluated. The results clearly show that gas diffusion in dry samples dominates gas transfer at very low pressure gradient, whereas permeation becomes predominant once the gas pressure exceeds a moderate value.Tests on partially saturated samples further indicate that gas transport is no longer governed solely by the pressure gradient, but is also influenced by the degree of saturation and capillary effects.
| Country | France |
|---|---|
| Acceptance of the Terms & Conditions | Click here to agree |
