Models for chloride ingress into concrete – from Collepardi to today
(2009) In International Journal of Modeling, Identification and Control 7(2). p.129-134- 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,... (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 2nd 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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1481912
- author
- Nilsson, Lars-Olof LU
- organization
- publishing date
- 2009
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- chloride, ingress, models, flux, binding, interaction
- in
- International Journal of Modeling, Identification and Control
- volume
- 7
- issue
- 2
- pages
- 129 - 134
- publisher
- Inderscience Publishers
- external identifiers
-
- scopus:67749127908
- ISSN
- 1746-6180
- DOI
- 10.1504/IJMIC.2009.027065
- language
- English
- LU publication?
- yes
- id
- f29df9ca-510f-4d8f-a0ca-e02dfe4d0683 (old id 1481912)
- date added to LUP
- 2016-04-01 12:33:13
- date last changed
- 2022-01-27 06:38:37
@article{f29df9ca-510f-4d8f-a0ca-e02dfe4d0683,
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.<br/><br>
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 2nd 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. <br/><br>
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}},
issn = {{1746-6180}},
keywords = {{chloride; ingress; models; flux; binding; interaction}},
language = {{eng}},
number = {{2}},
pages = {{129--134}},
publisher = {{Inderscience Publishers}},
series = {{International Journal of Modeling, Identification and Control}},
title = {{Models for chloride ingress into concrete – from Collepardi to today}},
url = {{http://dx.doi.org/10.1504/IJMIC.2009.027065}},
doi = {{10.1504/IJMIC.2009.027065}},
volume = {{7}},
year = {{2009}},
}