Alkali-Aggregate Reaction in Concrete: Investigations of Concrete Expansion from Alkali Contributed by Pozzolans or Slag

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Title: Alkali-Aggregate Reaction in Concrete: Investigations of Concrete Expansion from Alkali Contributed by Pozzolans or Slag

Author(s): M. M. Alaskal

Publication: Special Publication

Volume: 114

Issue:

Appears on pages(s): 431-452

Keywords: alkali-aggregate reactions; expansion; concretes; pozzolans; mix proportioning; prisms; slags; sodium hydroxide; Materials Research

Date: 5/1/1989

Abstract:
The results of studies on the contributions of alkalies in fly ash, slag, and silica fume to the expansion of concrete due to alkali-silica reaction are presented and discussed. A wide range of concrete mixtures was made. Each mixture contained a different amount of cement and different proportions of one type of fly ash, one type of slag, or one type of silica fume. All mixtures were made with amorphous-fused silica as a synthetic reactive aggregate. The alkalilevel of some mixtures was increased by sodium hydroxide to study the effects of pozzolans or slag mixtures at higher concentrations of alkalies. Concrete prisms were made and stored in water at 38 C. The test results indicate that the effectiveness of these supplementary cementing materials in reducing or increasing expansion due to alkali-silica reaction varies widely. The results also indicate that the supplementary cementing materials can contribute significant quantities of alkalies to the reaction, under particular replacement and test conditions employed.