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Concepts on the chloride diffusion coefficient



Title: Concepts on the chloride diffusion coefficient
Author(s): C. Andrade
Paper category : conference
Book title: Third International RILEM Workshop on Testing and Modelling Chloride Ingress into Concrete
Editor(s): C. Andrade and J. Kropp
Print-ISBN: 2-912143-48-9
e-ISBN: 2912143578
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 3 - 17
Total Pages: 15
Nb references: 18
Language: English


Abstract: Diffusion coefficient D, is considered the rate determining parameter of chloride ingress in concrete. In the paper D is defined following Crank and emphasis is made in that different D values are obtained from different testing conditions and from the units in which chloride concentration is expressed. Rigour and unit coherence is needed to be stressed. Regarding the comparison between Dns values, it is illustrated how different chloride concentrations at a certain concrete cover depth, are obtained when using the standard error function equation, if the surface concentration Cs is not the same. This evidence together with the influence of the degree of chloride binding and the testing time, may make impossible any comparison among Dns values and, therefore make misleading their use for predictive purposes. The papers ends with some considerations on the test types used for obtaining Ds and Dns values and proposes a multiregime method whose full description was made elsewhere. It proposes as well, a nomenclature to distinguish between the different D values and appraise them, therefore, univocally.


Online publication: 2002-12-15
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143578.001