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Title

Phenomenological mass-balance-based model of migration tests in stationary conditions: Application to non-steady-state tests

AuthorsCastellote, M.; Andrade, C.; Alonso, C.
KeywordsConcrete
Chloride diffusion coefficients
Migration tests
Transference numbers
Phenomenological model
Issue Date2000
PublisherElsevier
CitationCement and Concrete Research; Vol. 30; nº 12; págs. 1885-1893; (2000)
AbstractIn order to understand the phenomena that take place during a migration test, and to obtain a complete picture of the system through the pursuit of the transference numbers, a phenomenological mass-balance-based model of the evolution of all ionic species, has been developed. The model has been built on a series of steady-state migration tests and has been experimentally validated. Afterwards, it has been applied to migration tests in non-stationary conditions, and the resulting deductions have also been checked with experimental results. This has allowed the development of a new simplified way to determine the non-steady-state diffusion coefficients, Dns, just from the registration of the current intensity circulating and the analysis of the surface concentration, Cs, after the test. In addition, the possibility of the tabulation of the different Cs for different external chloride concentrations and the application of different “binding factors” for each kind of binder is posed, which will allow the calculation of the Dns from a simple migration test of the AASHTO type (ASTM C1202-91).
Publisher version (URL)http://www.sciencedirect.com/science/article/pii/S0008884600004105
URIhttp://hdl.handle.net/10261/47247
ISSN0008-8846
Appears in Collections:(CISDEM) Artículos
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