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Accession Number
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DE2012-1052823
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Title
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Impact of Standing Bleed Water on Saltstone Placement.
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Publication Date
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Sep 2012
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Media Count
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20p
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Personal Author
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A. D. Cozzi B. R. Pickenheim
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Abstract
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The amount of water present during placement and subsequent curing of saltstone has the potential to impact several properties important for grout quality. An active drain water system can remove residual standing water and expose the surface of the placed saltstone to air. Oxidation of the saltstone may result in an increase in the leachability of redox sensitive elements. A dry surface can lead to cracking, causing an increase in hydraulic conductivity. An inactive drain water system can allow standing water that generates unnecessary hydrostatic head on the vault walls. Standing water that cannot be removed via the drain system will be available for potential incorporation into subsequent grout placements. The objective of this work is to study the impact of standing water on grout quality pertaining to disposal units. A series of saltstone mixes were prepared, and cured at ambient temperature to evaluate the impact of standing water on saltstone placement. The samples were managed to control drying effects on leachability by either exposing or capping the samples. The water to premix ratio was varied to represent a range of processing conditions. Samples were analyzed for density, leachability, and hydraulic conductivity. A monolith of each composition was cut into four sections to analyze the homogeneity of the sample with respect to vertical position within the sample. The density of each section was measured by two methods, helium pycnometry and by ASTM 642-06. The results show a trend of increasing density with increasing depth in the samples. This effect is more pronounced with the inclusion of excess bleed water and indicative of increased settling.
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Keywords
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Cracking
Density
Drainage
Grouting
Hydraulic conductivity
Leachability
Oxidation
Radioactive waste processing
Saltstone
Samples
Trends
Waste disposal
Water removal
Water systems
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Source Agency
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Technical Information Center Oak Ridge Tennessee
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NTIS Subject Category
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77G - Radioactive Wastes & Radioactivity
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Corporate Author
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Savannah River National Lab., Aiken, SC. Savannah River Nuclear Solutions.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1307
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Contract Number
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N/A
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