Alkali silica reactivity of agglomerated silica fume |
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Authors: | Andrew J. Maas Maria C.G. Juenger |
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Affiliation: | a The Structural Alliance, 9401 LBJ Freeway, Suite 107, Dallas, TX 75243, USA b Department of Civil, Architectural, and Environmental Engineering, The University of Texas at Austin, 1 University Station C 1748, Austin, TX 78712, USA |
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Abstract: | It is commonly accepted that replacement of a portion of cement in mortar or concrete with well-dispersed silica fume reduces expansion caused by alkali silica reaction. Recently there has been much discussion that large, agglomerated particles of silica fume may actually act as alkali silica reactive aggregates, thereby increasing expansion rather than reducing it. The data in the literature, from both field and laboratory studies, are inconsistent. This prompted an extensive laboratory investigation into the alkali silica reactivity of silica fume. Results from accelerated expansion testing and microscopic investigations are presented. It was seen that some agglomerated silica fumes participate in ASR while others do not. Factors determining the reactivity of silica fume agglomerates are suggested. |
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Keywords: | Accelerated testing Alkali-aggregate reaction Mortar Pozzolan Silica fume SEM |
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