Bentz, D.
(2000),
Influence of Silica Fume on Diffusivity in Cement-Based Materials II. Multi-Scale Modeling of Concrete Diffusivity, Cement and Concrete Research, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860225 (Accessed May 11, 2026)
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Influence of Silica Fume on Diffusivity in Cement-Based Materials II. Multi-Scale Modeling of Concrete Diffusivity
Published
Author(s)
Abstract
Based on a set of multi-scale computer models, an equation is developed for predicting the chloride ion diffusivity of concrete as a function of water-to-cement (w/c) ratio, silica fume addition, degree of hydration, and aggregate volume fraction. Silica fume influences concrete diffusivity in several ways: 1) densifying the microstructure of the interfacial transition zone (ITZ) regions, 2) reducing the overall (bulk and ITZ) capillary porosity for a fixed degree of cement hydration, and 3) producing a pozzolanic C-S-H gel with a relative diffusivity about 25 times less than that of the C-S-H gel produced from conventional cement hydration. According to the equation and in agreement with results from the literature, silica fume is most efficient for reducing diffusivity in lower w/c ratio concretes (w/cCitation
Cement and Concrete Research
Volume
30
Issue
No. 7
Pub Type
Journals
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Keywords
building technology, concrete, diffusion, hydration, modeling, silica fume
Citation
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Created July 1, 2000, Updated June 2, 2021