期刊
APPLIED GEOCHEMISTRY
卷 89, 期 -, 页码 180-189出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apgeochem.2017.11.007
关键词
Geological disposal; Nuclear waste; Cement; Mineralogy; Microstructure
资金
- Radioactive Waste Management
- European Commission Horizon Research and Training Programme, Cebama, of the European Atomic Energy Community (EURATOM) [662147]
- EPSRC [EP/N017374/1]
- Department of Energy and Climate Change
- Scottish Funding Council's Oil and Gas Innovation Centre
- EPSRC [EP/N017374/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N017374/1] Funding Source: researchfish
In a conceptual UK geological disposal facility for nuclear waste within a high-strength, crystalline geology, a cement-based backfill material, known as Nirex Reference Vault Backfill (NRVB), will be used to provide a chemical barrier to radionuclide release. The NRVB is required to have specific properties to fulfil the operational requirements of the geological disposal facility (GDF); these are dependent on the chemical and physical properties of the cement constituent materials and also on the water content. With the passage of time, the raw materials eventually used to synthesise the backfill may not be the same as those used to formulate it. As such, there is a requirement to understand how NRVB performance may be affected by a change in raw material supply. In this paper, we present a review of the current knowledge of NRVB and results from a detailed characterisation of this material, comparing the differences in performance of the final product when different raw materials are used. Results showed that minor differences in the particle size, surface area and chemical composition of the raw material had an effect on the workability, compressive strength, the rate of hydration and the porosity, which may influence some of the design functions of NRVB. This study outlines the requirement to fully characterise cement backfill raw materials prior to use in a geological disposal facility and supports ongoing assessment of long-term post-closure safety.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据