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Influence of silica fume on diffusivity in cement-based materials. II. Multi-scale modeling of concrete diffusivity

Bentz, D.P.

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/c<0.4). In these systems, for moderate additions of silica fume (e.g., 10%), the reduction in concrete diffusivity may be a factor of 15 or more, which may substantially increase the service life of steel-reinforced concrete exposed in a severe corrosion environment.

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Influence of silica fume on diffusivity in cement-based materials. II. Multi-scale modeling of concrete diffusivity

Bentz, D.P.

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/c<0.4). In these systems, for moderate additions of silica fume (e.g., 10%), the reduction in concrete diffusivity may be a factor of 15 or more, which may substantially increase the service life of steel-reinforced concrete exposed in a severe corrosion environment.

Influence of silica fume on diffusivity in cement-based materials. II. Multi-scale modeling of concrete diffusivity

Bentz, D.P.

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/c<0.4). In these systems, for moderate additions of silica fume (e.g., 10%), the reduction in concrete diffusivity may be a factor of 15 or more, which may substantially increase the service life of steel-reinforced concrete exposed in a severe corrosion environment.

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Title:

Influence of silica fume on diffusivity in cement-based materials. II. Multi-scale modeling of concrete diffusivity

Contributors:

Bentz, D.P. (author)

Published in:

Cement and Concrete Research ; 30 ; 1121-1129

Publication date:

2000

Size:

9 Seiten, 25 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0008-8846(00)00263-5

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Zement , Diffusion , Konzentrationseinfluss , Siliciumoxid , mathematisches Modell , Rechnersimulation , Hydratisieren , Agglomerieren , Gehalt (Zusammensetzung) , Mikrostruktur , Verdichtung , Grenzfläche , Wasser-Zement-Wert , Mikrosilica , Calciumsilicathydrat , Volumenfraktion

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