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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: Silica Fume Concrete to High-Strength Precast Prestressed Highway Bridge Girders
Author(s): Colin D. Johnston
Publication: Special Publication
Appears on pages(s): 1077-1100
Keywords: bridges (structures); compressive strength; costs; girders; high-strength concretes; plasticizers; precast concrete; silica fume; prestressed concrete; Materials Research
Abstract:Mixtures employing silica fume (SF) and superplasticizers with a worst-case combination of the available local gravel and cement sources were evaluated using 250 to 500 kg/m3 of Type I cement instead of Type III, and up to 15 percent silica fume. Many of the mixtures evaluated met or substantially exceeded the specified strength criteria at a cost below that of the concretes presently used. Hardened concrete air void parameters are also satisfactory for the SF concretes examined. A mixture using 300 kg/m3 of Type I cement with 10 percent SF comfortably met the present strength specifications at considerably reduced material cost when using accelerated curing. However, 20-hr strengths of 45 to 50 MPa and 28-day strengths over 50 MPa are possible with higher cement contents. A mixture using 450 kg/m3 of Type I cement with 10 percent SF can just meet the 20-hr strength requirement without accelerated curing, and its 28-day strength exceeds the current specification requirement by more than 50 percent. Slightly lower material costs and the saving associated with eliminating accelerated curing coupled with long-term strength in excess of 60 MPa make this concrete attractive in terms of both cost and strength if designers can fully utilize the higher strength.
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