In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
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: Expansion of Powerhouse Structures Due to Alkali-Aggregate Reaction and the Use of low Calcium Fly Ash to Ameliorate the Reaction in Future Construction
Author(s): W. S. Langley and E. Brown
Publication: Special Publication
Appears on pages(s): 131-148
Keywords: alkali-aggregate reactivity; concrete prism; expansion;
fly ash; monitoring, mortar bar test; powerhouse structures
Abstract:Alkali-aggregate reactivity, a reaction between the alkalies in the concrete pore fluid and certain siliceous aggregates was identified as a cause of disruptive expansion in concrete in Nova Scotia in 1962. Powerhouse structures, constructed with concrete containing meta-sediments and biotite schists which are commonly used as concrete aggregate in Nova Scotia, caused expansion which created problems with the operation of the plants within 10 years after construction. Extensive studies in the mid 1960’s and late 1980’s of operating quarries and deteriorated structures, indicated that the reactive aggregates were widespread. Studies in the 1980’s on the use of low calcium fly ash as a replacement or addition for portland cement showed conclusively that the reaction could be ameliorated with 15 to 30 percent fly ash replacement of the cement. Low calcium fly ash is now used systematically to lessen the potential for alkali-aggregate reaction.
Click here to become an online Journal subscriber