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Unsaturated ion diffusion in cementitious materials – The effect of slag and silica fume

Olsson, Nilla LU ; Lothenbach, Barbara ; Baroghel-Bouny, Véronique and Nilsson, Lars Olof LU (2018) In Cement and Concrete Research 108. p.31-37
Abstract

This paper investigates the moisture dependency of ion diffusion in binary cementitious binders with Portland cement (OPC) in combination with slag or silica fume. Resistivity measurements and calculations with a thermodynamic model, GEMS, were used to assess the unsaturated chloride diffusion coefficient. The results show that the relation between the relative diffusion coefficient and the degree of saturation is not significantly affected by w/b (in the investigated range of w/b from 0.38 to 0.53), while the investigated binder compositions seem to affect the relation. These results are of value for service-life models, where they potentially represent important input data. The results also highlight the need for considering the pore... (More)

This paper investigates the moisture dependency of ion diffusion in binary cementitious binders with Portland cement (OPC) in combination with slag or silica fume. Resistivity measurements and calculations with a thermodynamic model, GEMS, were used to assess the unsaturated chloride diffusion coefficient. The results show that the relation between the relative diffusion coefficient and the degree of saturation is not significantly affected by w/b (in the investigated range of w/b from 0.38 to 0.53), while the investigated binder compositions seem to affect the relation. These results are of value for service-life models, where they potentially represent important input data. The results also highlight the need for considering the pore solution conductivity when using resistivity measurements for evaluation of ion transport properties.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Diffusion (C), Durability (C), Modeling (E), Pore solution (B), Transport properties (C)
in
Cement and Concrete Research
volume
108
pages
7 pages
publisher
Elsevier
external identifiers
  • scopus:85044736303
ISSN
0008-8846
DOI
10.1016/j.cemconres.2018.03.007
language
English
LU publication?
yes
id
7d8ee014-0416-44ff-b5ea-e2b693e7db53
date added to LUP
2018-04-10 10:14:05
date last changed
2021-10-06 05:50:36
@article{7d8ee014-0416-44ff-b5ea-e2b693e7db53,
  abstract     = {<p>This paper investigates the moisture dependency of ion diffusion in binary cementitious binders with Portland cement (OPC) in combination with slag or silica fume. Resistivity measurements and calculations with a thermodynamic model, GEMS, were used to assess the unsaturated chloride diffusion coefficient. The results show that the relation between the relative diffusion coefficient and the degree of saturation is not significantly affected by w/b (in the investigated range of w/b from 0.38 to 0.53), while the investigated binder compositions seem to affect the relation. These results are of value for service-life models, where they potentially represent important input data. The results also highlight the need for considering the pore solution conductivity when using resistivity measurements for evaluation of ion transport properties.</p>},
  author       = {Olsson, Nilla and Lothenbach, Barbara and Baroghel-Bouny, Véronique and Nilsson, Lars Olof},
  issn         = {0008-8846},
  language     = {eng},
  month        = {06},
  pages        = {31--37},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Unsaturated ion diffusion in cementitious materials – The effect of slag and silica fume},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2018.03.007},
  doi          = {10.1016/j.cemconres.2018.03.007},
  volume       = {108},
  year         = {2018},
}