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 October 15, 2024)
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
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
Download Paper
Keywords
building technology, concrete, diffusion, hydration, modeling, silica fume
Citation
Issues
If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.
Created July 1, 2000, Updated June 2, 2021