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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Durability of DSP Mortars Exposed to Conditions of Wetting and Drying
Author(s): D. A. St. John; L. C. McLeod; and Neil B. Milestone
Publication: Special Publication
Appears on pages(s): 45-56
Keywords: alkali-aggregate reactions; petrography; silica fume; Materials Research
Abstract:DSP mortar bars used to measure volume changes as a result of exposure to wetting and drying have expanded and failed. Petrographic investigation showed that the failures have occurred due to alkali-aggregate reaction of undispersed agglomerates of silica fume. Investigation of the particle size ranges and dispersiblity of a range of silica fumes showed that they were all agglomerated to varying degrees and that the dispersibility is dependent on source and age of the silica fume. It is concluded that unless silica fume can be adequately dispersed in DSP materials there will be a potential for alkali-aggregate reaction to occur where the exposure conditions involve wetting and drying.
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