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- W2128184494 abstract "This paper presents the results of a study of chloride ion ingress into silica fume concretes designed for full-depth and overlay placements of highway bridge decks. Mixtures for each application were prepared over a range of silica fume contents and water-to-cementitious material ratios (w/cm). Concrete laboratory specimens were prepared for ponding of chloride solution over 180 days. Cores taken from the specimens were milled at 1 mm increments and powders analyzed for total chloride ion. Data were then fitted to Fick's second law of diffusion to obtain apparent chloride ion diffusion coefficients. Regression analyses were performed on data developed from the laboratory testing, and response surface models were developed. Analyses of variance were carried out to compare behavior of Type K cement concretes and concretes prepared with silica fume in slurry form. For any given w/cm, as silica fume content was increased, the apparent chloride ion diffusion coefficient dropped. The most sensitive region was in the lower range of silica fume contents, where the apparent chloride ion diffusion coefficient changed at a faster rate as the silica fume content was increased. At silica fume contents over 4-6%, a much greater addition was needed to effect a large change in diffusivity. A point of diminishing returns may be reached at silica fume contents over approximately 6%. At the lower w/cm values, the apparent chloride ion diffusion coefficient is relatively insensitive to increases in the silica fume content above 6%. The effects of w/cm on apparent chloride ion diffusion coefficient were much less than that of silica fume content. Use of Type K cement or type of silica fume did not have a significant effect on results." @default.
- W2128184494 created "2016-06-24" @default.
- W2128184494 date "1999-01-01" @default.
- W2128184494 modified "2023-09-24" @default.
- W2128184494 title "Statistical Approach to Ingress of Chloride Ions in Silica Fume Concrete for Bridge Decks" @default.
- W2128184494 doi "https://doi.org/10.14359/793" @default.
- W2128184494 hasPublicationYear "1999" @default.
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