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Non-Saturated Ion Diffusion In Concrete–A New Approach To Evaluate Conductivity Measurements

Olsson, Nilla LU ; Baroghel-Bouny, Véronique ; Nilsson, Lars-Olof LU and Thiery, Mickaël (2013) In Cement & Concrete Composites 40. p.40-47
Abstract
Non-saturated ion diffusion properties of cementitious materials were evaluated in an experimental study. To assess these properties, resistivity measurements have been performed on mortars with different binders (ordinary Portland cement – OPC, OPC with 5% silica fume, 40% slag and 70% slag, respectively) and different water-to-binder ratios (w/b, 0.38 and 0.53). Specimens have been conditioned to eight different climates with relative humidity (RH) from 100% to 33% RH in order to assess an effective diffusion coefficient. The results from the resistivity measurements have been corrected for changes of the conductivity of the pore solution when drying to different degrees of saturation.

The diffusion coefficients for Portland... (More)
Non-saturated ion diffusion properties of cementitious materials were evaluated in an experimental study. To assess these properties, resistivity measurements have been performed on mortars with different binders (ordinary Portland cement – OPC, OPC with 5% silica fume, 40% slag and 70% slag, respectively) and different water-to-binder ratios (w/b, 0.38 and 0.53). Specimens have been conditioned to eight different climates with relative humidity (RH) from 100% to 33% RH in order to assess an effective diffusion coefficient. The results from the resistivity measurements have been corrected for changes of the conductivity of the pore solution when drying to different degrees of saturation.

The diffusion coefficients for Portland cement binders within the range 100–59% RH are presented.They showed that the diffusion coefficient of the mortar with high w/b ratio was higher at high RH,but at low RH the opposite trend was found. By comparing these results with the corresponding desorption isotherms, it is shown that the diffusion coefficient for the two w/b ratios have the same dependency

on the degree of saturation. (Less)
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ion transport Non-saturation Chloride Alkali
in
Cement & Concrete Composites
volume
40
pages
40 - 47
publisher
Elsevier
external identifiers
  • wos:000320298300006
  • scopus:84877845925
ISSN
0958-9465
DOI
10.1016/j.cemconcomp.2013.04.001
language
English
LU publication?
yes
id
0f63e3b4-6e46-4851-9b09-3e1439251a38 (old id 3801895)
date added to LUP
2016-04-01 10:03:20
date last changed
2022-04-12 01:20:38
@article{0f63e3b4-6e46-4851-9b09-3e1439251a38,
  abstract     = {{Non-saturated ion diffusion properties of cementitious materials were evaluated in an experimental study. To assess these properties, resistivity measurements have been performed on mortars with different binders (ordinary Portland cement – OPC, OPC with 5% silica fume, 40% slag and 70% slag, respectively) and different water-to-binder ratios (w/b, 0.38 and 0.53). Specimens have been conditioned to eight different climates with relative humidity (RH) from 100% to 33% RH in order to assess an effective diffusion coefficient. The results from the resistivity measurements have been corrected for changes of the conductivity of the pore solution when drying to different degrees of saturation.<br/><br>
The diffusion coefficients for Portland cement binders within the range 100–59% RH are presented.They showed that the diffusion coefficient of the mortar with high w/b ratio was higher at high RH,but at low RH the opposite trend was found. By comparing these results with the corresponding desorption isotherms, it is shown that the diffusion coefficient for the two w/b ratios have the same dependency<br/><br>
on the degree of saturation.}},
  author       = {{Olsson, Nilla and Baroghel-Bouny, Véronique and Nilsson, Lars-Olof and Thiery, Mickaël}},
  issn         = {{0958-9465}},
  keywords     = {{Ion transport Non-saturation Chloride Alkali}},
  language     = {{eng}},
  pages        = {{40--47}},
  publisher    = {{Elsevier}},
  series       = {{Cement & Concrete Composites}},
  title        = {{Non-Saturated Ion Diffusion In Concrete–A New Approach To Evaluate Conductivity Measurements}},
  url          = {{http://dx.doi.org/10.1016/j.cemconcomp.2013.04.001}},
  doi          = {{10.1016/j.cemconcomp.2013.04.001}},
  volume       = {{40}},
  year         = {{2013}},
}