Effect of chemical reactions on the hydrologic properties of fractured and rubbelized glass media |
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| Institution: | 1. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA;2. Department of Chemistry, Washington State University, P.O. Box 644630, Pullman, WA 99164, USA;3. Energy and Environment Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA;1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park 16802, USA;2. Department of Chemical Engineering and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA;3. Science and Technology Division, Corning Incorporated, Corning, NY 14830, USA;4. CEA, DES, ISEC, DE2D, University of Montpellier, Marcoule, F-30207 Bagnols sur Cèze, France;1. Leibniz Universität Hannover, Institute of Mineralogy, Callinstr. 3, 30167 Hannover, Germany;2. ZFM, – Center for Solid State Chemistry and New Materials, Leibniz Universität Hannover, Germany;3. Federal Institute for Materials Research and Testing, BAM, 12489 Berlin, Germany;4. Stanford University, Department of Chemistry, Stanford, CA 94305, USA;5. Stanford University, Department of Geological Sciences, Stanford, CA 94305, USA |
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| Abstract: | Understanding the effect of chemical reactions on the hydrologic properties of geological media, such as porosity, permeability and dispersivity, is critical to many natural and engineered sub-surface systems. Influence of glass corrosion (precipitation and dissolution) reactions on fractured and rubbelized (crushed) forms HAN28 and LAWBP1, two candidate waste glass forms for a proposed immobilized low-activity waste (ILAW) disposal facility at the Hanford, WA site, was investigated. Flow and tracer transport experiments were conducted using fractured and rubbelized forms, before and after subjecting them to corrosion using vapor hydration testing (VHT) at 200 °C temperature and 200 psig pressure, causing the precipitation of alteration products. Data were analyzed using analytical expressions and CXTFIT, a transport parameter optimization code, for the estimation of the hydrologic characteristics before and after VHT. It was found that glass reactions significantly influence the hydrologic properties of ILAW glass media. Hydrologic properties of rubbelized glass decreased due to precipitation reactions, whereas those of fractured glass media increased due to reaction which led to unconfined expansion of fracture aperture. The results are unique and useful to better understand the effect of chemical reactions on the hydrologic properties of fractured and rubbelized stony media in general and glass media in particular. |
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