Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/505266 |
| 报告编号 | SAND--97-1425 |
| 来源ID | OSTI_ID: 505266 |
| Verification of the integrity of barriers using gas diffusion | |
| Ward, D.B. [SPECTRA Research Inst., Albuquerque, NM (United States)]; Williams, C.V. [Sandia National Labs., Albuquerque, NM (United States). Environmental Restoration Technologies Dept.] | |
| 英文摘要 | In-situ barrier materials and designs are being developed for containment of high risk contamination as an alternative to immediate removal or remediation. The intent of these designs is to prevent the movement of contaminants in either the liquid or vapor phase by long-term containment, essentially buying time until the contaminant depletes naturally or a remediation can be implemented. The integrity of the resultant soil-binder mixture is typically assessed by a number of destructive laboratory tests (leaching, compressive strength, mechanical stability with respect to wetting and freeze-thaw cycles) which as a group are used to infer the likelihood of favorable long-term performance of the barrier. The need exists for a minimally intrusive yet quantifiable methods for assessment of a barrier`s integrity after emplacement, and monitoring of the barrier`s performance over its lifetime. Here, the authors evaluate non-destructive measurements of inert-gas diffusion (specifically, SF{sub 6}) as an indicator of waste-form integrity. The goals of this project are to show that diffusivity can be measured in core samples of soil jet-grouted with Portland cement, validate the experimental method through measurements on samples, and to calculate aqueous diffusivities from a series of diffusion measurements. This study shows that it is practical to measure SF{sub 6} diffusion rates in the laboratory on samples of grout (Portland cement and soil) typical of what might be used in a barrier. Diffusion of SF{sub 6} through grout (Portland cement and soil) is at least an order of magnitude slower than through air. The use of this tracer should be sensitive to the presence of fractures, voids, or other discontinuities in the grout/soil structure. Field-scale measurements should be practical on time-scales of a few days. |
| 出版年 | 1997 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 05 NUCLEAR FUELS ; RADIOACTIVE WASTE DISPOSAL ; CONTAINMENT SYSTEMS ; NONDESTRUCTIVE TESTING ; PERFORMANCE TESTING ; PERMEABILITY ; UNDERGROUND DISPOSAL ; REMEDIAL ACTION ; SULFUR FLUORIDES ; DIFFUSION |
| URL | http://www.osti.gov/scitech/servlets/purl/505266 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/267163 |
| 推荐引用方式 GB/T 7714 | Ward, D.B. [SPECTRA Research Inst., Albuquerque, NM ,Williams, C.V. [Sandia National Labs., Albuquerque, NM . Verification of the integrity of barriers using gas diffusion,1997. |
| 条目包含的文件 | 条目无相关文件。 | |||||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
