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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.
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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: Overview of Fly Ash and Silica Fume Concretes: The Need for Rational Curing Standards
Author(s): M. E. Ayers and M. S. Khan
Publication: Special Publication
Appears on pages(s): 605-622
Keywords: air entrainment; bleeding (concrete); curing;, durability; fly ash; heat of hydration; permeability; plastic shrinkage; segregation; silica fume; strength; workability; Materials Research
Abstract:Developments in the use of fly ash and silica fume in portland cement concrete are critically reviewed. Concrete properties, both in the fresh and hardened states, that are influenced by the addition of fly ash and silica fume are discussed. The effects on workability, segregation, bleeding, air entrainment, heat of hydration, and plastic shrinkage cracking are reviewed relative to fresh concrete. The influence on strength, permeability, drying shrinkage, creep, steel-to-concrete bond, alkali-silica reactivity, resistance to reinforcing steel corrosion, and resistance to sulfate attack are documented for hardened concrete. The curing requirement of fly ash and silica fume concrete is identified as one of the important areas that needs further investigation to utilize the full potential of these concretes. The literature contains a reasonable amount of data concerning the curing requirement of fly ash concretes. However, very limited data on the curing requirements of silica fume concrete are available. A significant amount of confusion exists in the construction industry regarding the curing of silica fume concrete. In the absence of adequate specifications, overcuring of silica fume concrete is the general practice. A brief review of the available literature concerning the curing requirements of fly ash and silica fume concretes is presented.
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