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The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.


Investigation of Concrete Containing Condensed Silica Fume
H. Celik Ozyildirim
H. Celik Ozyildirim
Year: 1986
VTRC No.: 86-R25
Abstract: The properties of hydraulic cement concretes containing silica fume were investigated to assess their suitability for use in overlays with a minimum thickness of 1 1/4 in. The properties studied were compressive and flexural strengths, bond strength, modulus of elasticity, permeability, freeze-thaw resistance, thermal expansion, and drying shrinkage. The characteristics of sir voids in the hardened concrete were determined by petrographic examination. The study was conducted in two stages: the first to determine the mixture proportions that would yield satisfactorily high strengths and low permeabilities, and the second to conduct the main testing program. Silica fume from two sources was used. Concretes made with silica fume from either source at a water-cement ratio of 0.40 or lower and s replacement rate of 5% yielded the desirable properties. It is expected that concretes made with silica fume can provide a cost-effective protective system for bridge decks when placed in overlays with a minimum thickness of 1 1/4 in.