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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: Ettringite Formation in Dam Gallery
Author(s): R. A. Kennerley
Publication: Journal Proceedings
Appears on pages(s): 559-576
Keywords: calcium sulfoaluminate, concrete, dam, efflorescence, ettringite, fly ash, prepacked concrete, sulfate.
Abstract:The formation of a deposit of ettringite in a submerged dam gallery is described. It occurred in an area where a fly ash-cement mixture had been used for the placement of pre-packed concrete. Where fly ash was used to replace a portion of the cement in conventionally placed concrete nearby, no such deposit was observed. No evidence of deterioration of the concrete could be found. It is believed that water seeping along permeable planes in the concrete dissolved some of the sulfate and alumina-containing phases formed during cement hydration and, on reaching the gallery, ettringit tew asprecipitated from the solution. The deposit was found adjacent to a stop-work plane in the grouting of the aggregates, and it is thought that the concrete at this point could have become enriched in lighter hydration products (e.g., calcium sulfoaluminate, calcium hydroxide) and grout admixtures. The formation of ettringite as a stable product of cement hydration would have been assisted by additional sulfate derived from the fly ash.
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