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Present limitations of models for predicting chloride ingress into reinforced concrete structures

Nilsson, Lars-Olof LU (2006) International Workshop NUCPERF 2006: Corrosion and Long Term Performance of Concrete in NPP and Waste Facilities In Journal de Physique IV: Proceedings 136. p.123-130
Abstract
Models to predict chloride ingress are numerous but all of them have serious limitations that restrict the present use for long term predictions. An overview is given of the fundamental differences between various models, from those based on Fick's 2nd with constant or time-dependent diffusion coefficients and surface chloride contents, to those based on chloride transport equations with or without a multi-species approach. The key advantages and limitations of each type of model are identified and the research needs are summarized and discussed. The three main limitations are shown to be (i) the lack of understanding the time-dependency of the apparent chloride diffusion coefficients, (ii) the lack of good long-term data, the chloride... (More)
Models to predict chloride ingress are numerous but all of them have serious limitations that restrict the present use for long term predictions. An overview is given of the fundamental differences between various models, from those based on Fick's 2nd with constant or time-dependent diffusion coefficients and surface chloride contents, to those based on chloride transport equations with or without a multi-species approach. The key advantages and limitations of each type of model are identified and the research needs are summarized and discussed. The three main limitations are shown to be (i) the lack of understanding the time-dependency of the apparent chloride diffusion coefficients, (ii) the lack of good long-term data, the chloride content increase with time close to the exposed surface and (iii) the difficulties in quantifying the boundary conditions for sophisticated ingress models. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Surface chloride content, Chloride transport equations
in
Journal de Physique IV: Proceedings
volume
136
pages
123 - 130
publisher
EDP Sciences
conference name
International Workshop NUCPERF 2006: Corrosion and Long Term Performance of Concrete in NPP and Waste Facilities
external identifiers
  • wos:000242777700013
  • scopus:33846627618
ISSN
1764-7177
DOI
10.1051/jp4:2006136013
language
English
LU publication?
yes
id
e11ec94a-5f70-4e26-95fa-42b3663e38b1 (old id 617116)
date added to LUP
2007-12-20 12:43:18
date last changed
2017-01-01 08:27:45
@article{e11ec94a-5f70-4e26-95fa-42b3663e38b1,
  abstract     = {Models to predict chloride ingress are numerous but all of them have serious limitations that restrict the present use for long term predictions. An overview is given of the fundamental differences between various models, from those based on Fick's 2nd with constant or time-dependent diffusion coefficients and surface chloride contents, to those based on chloride transport equations with or without a multi-species approach. The key advantages and limitations of each type of model are identified and the research needs are summarized and discussed. The three main limitations are shown to be (i) the lack of understanding the time-dependency of the apparent chloride diffusion coefficients, (ii) the lack of good long-term data, the chloride content increase with time close to the exposed surface and (iii) the difficulties in quantifying the boundary conditions for sophisticated ingress models.},
  author       = {Nilsson, Lars-Olof},
  issn         = {1764-7177},
  keyword      = {Surface chloride content,Chloride transport equations},
  language     = {eng},
  pages        = {123--130},
  publisher    = {EDP Sciences},
  series       = {Journal de Physique IV: Proceedings},
  title        = {Present limitations of models for predicting chloride ingress into reinforced concrete structures},
  url          = {http://dx.doi.org/10.1051/jp4:2006136013},
  volume       = {136},
  year         = {2006},
}