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Models for chloride ingress into concrete - From Collepardi to Today

Nilsson, Lars-Olof LU (2008) International Conference on Durability of Concrete Structures In Advances in Concrete Structural Durability, Proceedings of ICDCS2008, Vol 1 and 2 p.36-42
Abstract
The first model to predict chloride ingress into concrete was presented by Collepardi in 1970, in Italian! That model was used for some 20 years for design of concrete structures before it was realized that the main parameter, the apparent chloride diffusion coefficient, is not a material property! Since then the Collepardi model has been significantly improved and developed into more or less sophisticated probabilistic models. Today we have numerous models for predicting chloride ingress but all of them have serious limitations that restrict the present use for long term predictions. The paper describes the history of developing chloride ingress models. An overview is given of the fundamental differences between various models, from those... (More)
The first model to predict chloride ingress into concrete was presented by Collepardi in 1970, in Italian! That model was used for some 20 years for design of concrete structures before it was realized that the main parameter, the apparent chloride diffusion coefficient, is not a material property! Since then the Collepardi model has been significantly improved and developed into more or less sophisticated probabilistic models. Today we have numerous models for predicting chloride ingress but all of them have serious limitations that restrict the present use for long term predictions. The paper describes the history of developing chloride ingress models. An overview is given of the fundamental differences between various models, from those based on Fick's 2(nd) law and 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 three main limitations are shown to be the lack of understanding the time-dependency of the apparent chloride diffusion coefficients, and the lack of good long-term data, the chloride content increase with time close to the exposed surface and the difficulties in quantifying the boundary conditions for sophisticated ingress models. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
interaction, flux, models, chloride, ingress, binding
in
Advances in Concrete Structural Durability, Proceedings of ICDCS2008, Vol 1 and 2
pages
36 - 42
publisher
Zhejiang University Press
conference name
International Conference on Durability of Concrete Structures
external identifiers
  • WOS:000264739300004
ISBN
9787308063913
language
English
LU publication?
yes
id
ce13c8ff-f71c-42dd-b774-ba9575b63cb8 (old id 1399319)
date added to LUP
2009-05-28 12:40:37
date last changed
2016-04-16 07:19:59
@inproceedings{ce13c8ff-f71c-42dd-b774-ba9575b63cb8,
  abstract     = {The first model to predict chloride ingress into concrete was presented by Collepardi in 1970, in Italian! That model was used for some 20 years for design of concrete structures before it was realized that the main parameter, the apparent chloride diffusion coefficient, is not a material property! Since then the Collepardi model has been significantly improved and developed into more or less sophisticated probabilistic models. Today we have numerous models for predicting chloride ingress but all of them have serious limitations that restrict the present use for long term predictions. The paper describes the history of developing chloride ingress models. An overview is given of the fundamental differences between various models, from those based on Fick's 2(nd) law and 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 three main limitations are shown to be the lack of understanding the time-dependency of the apparent chloride diffusion coefficients, and the lack of good long-term data, the chloride content increase with time close to the exposed surface and the difficulties in quantifying the boundary conditions for sophisticated ingress models.},
  author       = {Nilsson, Lars-Olof},
  booktitle    = {Advances in Concrete Structural Durability, Proceedings of ICDCS2008, Vol 1 and 2},
  isbn         = {9787308063913},
  keyword      = {interaction,flux,models,chloride,ingress,binding},
  language     = {eng},
  pages        = {36--42},
  publisher    = {Zhejiang University Press},
  title        = {Models for chloride ingress into concrete - From Collepardi to Today},
  year         = {2008},
}