Laboratory investigation of lithium-bearing compounds for use in concrete.
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2002-06-01
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By Lane, D. S.
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Abstract:Lithium nitrate and lithium hyroxide were evaluated in the laboratory to examine their effectiveness in controlling expansions resulting from alkali-silica reaction and their effect on concrete properties. The lithium compounds were more effective in highly accelerated tests using Pyrex as the aggregate than in concrete prism tests using a reactive Virginia aggregate. The effective dosage of lithium nitrate in the concrete prism test was higher than that typically recommended. Lithium nitrate had a benign effect on the strength, electrical resistance, drying shrinkage, and resistance to freezing and thawing. Similar results were obtained with lithium hydroxide, with the exception of a retarding effect on strength development. Using current sources of fly ash and slag is more effective in addressing problems with ASR than using lithium admixtures.
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