Twenty Years of In-Situ Exposure to Extremely Aggressive Environment of 36 Edge Beams Cast Using Silica Fume, Fly Ash and Polypropylene Fibres

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Title: Twenty Years of In-Situ Exposure to Extremely Aggressive Environment of 36 Edge Beams Cast Using Silica Fume, Fly Ash and Polypropylene Fibres

Author(s): B. Buhr, E. S. Larsen, K. Eriksen, E. Stoltzner, and P. Fidjestik

Publication: Special Publication

Volume: 212

Issue:

Appears on pages(s): 143-164

Keywords: bridge beams; compressive strength; durability; fly ash; long-term performance; petrographic analysis; polypropylene fibres; silica fume

Date: 6/1/2003

Abstract:
Some of the edge beams of the Fiskebek bridge in Denmark were cast using a number of concrete types with varying contents of silica fume (0%, 10%, 17%, 20%, and 50% by mass of cement), fly ash (0%, 40%, 45% by mass of cement) and polypropylene fibres (1.25% vol., 1.75% vol.). The edge beams were cast and placed on the bridge in 1980 - 81. Investigations over the years cover visual inspections, freezing and thawing tests, detailed chloride profiles (after 13 and 21 years of in-situ exposure and in the laboratory), compressive strength tests (at 28 days and 20 years after casting) and petrographic analysis on thin sections (at time of casting, 3, 6, 13 and 20 years after casting). The paper presents the results covering among others the correlation between the diffusion coefficient, silica fume content and equivalent water-cement ratio. In addition the results from determination of the number of micro cracks, silica fume content, equivalent water-cement ratio and compressive strength are presented.