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Diffusion of a mixture of cations and anions dissolved in water

Johannesson, Björn LU (1999) In Cement and Concrete Research 29(8). p.1261-1270
Abstract
In service life modeling of concrete, the ion transport in the pore solution is crucial. The main deterioration phenomena associated

with ions in the pore solution are (1) corrosion due to external chloride ions reaching the embedded reinforcement bars; (2) carbonation

due to presence of dissolved carbon dioxide (which will form carbonic acid with water) supplied from the surrounding air; and (3) leaching

of hydroxide ions from the pore solution to the surrounding environment. Models dealing with diffusion of ions are usually based on

the mass balance equations for the individual diffusing ions together with constitutive relations for the mass density flows and for the mass

exchange among the... (More)
In service life modeling of concrete, the ion transport in the pore solution is crucial. The main deterioration phenomena associated

with ions in the pore solution are (1) corrosion due to external chloride ions reaching the embedded reinforcement bars; (2) carbonation

due to presence of dissolved carbon dioxide (which will form carbonic acid with water) supplied from the surrounding air; and (3) leaching

of hydroxide ions from the pore solution to the surrounding environment. Models dealing with diffusion of ions are usually based on

the mass balance equations for the individual diffusing ions together with constitutive relations for the mass density flows and for the mass

exchange among the constituents. The important consequences of electroneutrality among the diffusing ions, however, is often omitted in

models dealing with diffusion of ions in the pore solution of concrete. Here a method will be examined that allows diffusion of different

ions in water, which satisfies both the electroneutrality requirement and the mass balance laws. For simplicity the effect of built-up electric

double layers on the charged pore walls will not be treated. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Diffusion, Carbonation, Leaching, Pore solution, Surface layer
in
Cement and Concrete Research
volume
29
issue
8
pages
1261 - 1270
publisher
Elsevier
external identifiers
  • scopus:0032684548
ISSN
0008-8846
DOI
10.1016/S0008-8846(99)00114-3
language
English
LU publication?
yes
id
92936d90-8c74-4376-89fd-30b12bd0ea72 (old id 1528089)
date added to LUP
2010-01-13 11:25:32
date last changed
2017-01-01 06:44:02
@article{92936d90-8c74-4376-89fd-30b12bd0ea72,
  abstract     = {In service life modeling of concrete, the ion transport in the pore solution is crucial. The main deterioration phenomena associated<br/><br>
with ions in the pore solution are (1) corrosion due to external chloride ions reaching the embedded reinforcement bars; (2) carbonation<br/><br>
due to presence of dissolved carbon dioxide (which will form carbonic acid with water) supplied from the surrounding air; and (3) leaching<br/><br>
of hydroxide ions from the pore solution to the surrounding environment. Models dealing with diffusion of ions are usually based on<br/><br>
the mass balance equations for the individual diffusing ions together with constitutive relations for the mass density flows and for the mass<br/><br>
exchange among the constituents. The important consequences of electroneutrality among the diffusing ions, however, is often omitted in<br/><br>
models dealing with diffusion of ions in the pore solution of concrete. Here a method will be examined that allows diffusion of different<br/><br>
ions in water, which satisfies both the electroneutrality requirement and the mass balance laws. For simplicity the effect of built-up electric<br/><br>
double layers on the charged pore walls will not be treated.},
  author       = {Johannesson, Björn},
  issn         = {0008-8846},
  keyword      = {Diffusion,Carbonation,Leaching,Pore solution,Surface layer},
  language     = {eng},
  number       = {8},
  pages        = {1261--1270},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Diffusion of a mixture of cations and anions dissolved in water},
  url          = {http://dx.doi.org/10.1016/S0008-8846(99)00114-3},
  volume       = {29},
  year         = {1999},
}