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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: Mix Proportions and Strength Characteristics of Concrete Containing 50 Percent Low-Calcium Fly Ash
Author(s): R. N. Swamy and H. B. Mahmud
Publication: Special Publication
Appears on pages(s): 413-432
Keywords: compressive strength; concretes; curing; flexural
strength; fly ash; high-strength concretes; mix proportioning;
modulus of elasticity; plasticizers; stress-strain relationships;
Abstract:Data on the mix design, strength and elasticity properties of concrete containing 50% low calcium fly ash replacement and a superplasticizer for 28 day strengths of 20 to 60 MPa are presented. It is shown that for concretes with low water-cement ratios of 0.32 to 0.42, high early strength of 12 to 20 Mpa in one day and 28 day strengths of 45 to 60 MPa can be produced with slumps in excess of 150mm. Under wet curing such concretes can give strength increases of 50 to 100% from 28 days to one year compared to increases of 18 to 25% for all OPC concretes. Even under the worst curing conditions, fly ash concretes showed a slow but steady strength gain and maintained their target strengths at one year whereas all OPC concretes under similar conditions showed strengths of 25 to 35% below the target strength. Air drying always produced greater losses in strength and elasticity in all OPC concretes than in fly ash concretes. The latter were able to develop flexural strengths of 3.5 to 6.0 MPa and tensile splitting strengths of 2.0 to 4.5 MPa at one year under these conditions. The practical and technical benefits of incorporating high fly ash contents are emphasized.
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