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Pro047

Chloride transport in concrete from lab test to in situ performance



Author(s): M. Manuela Salta, A.P. Melo, N. Garcia, E.V. Pereira, A.B. Ribeiro
Paper category: Workshop
Book title: International RILEM Workshop on Performance Based Evaluation and Indicators for Concrete Durability
Editor(s): V. Baroghel-Bouny, C. Andrade, R. Torrent, K. Scrivener
ISBN: 978-2-912143-95-2
Pages: 229 - 240
Total Pages: 12
Language: English


Abstract: 
The evaluation of chloride transport process is very important to predict the corrosion risk and to estimate the service life of reinforced concrete structures in marine environment. Different concrete miwes were prepared, using three w/b ratio, two types of cement CEM I and CEM IV and silica fume addition. From each concrete mix several specimens were cast for characterisation in lab of durability concrete properties after 28 days of curing in moist conditions and for natural exposure in marine environment in three conditions: airborne salt spray, tidal and submerged. Concrete chloride profiles were obtained at various time intervals 0.5, 1, 2 and 3 years. Adjusting the Crank's solution of Fick's second law to the chloride profiles two parameters, the apparent diffusion coefficients and surface chloride content, were obtained. These two parameters show an exponential time evolution and the values reached at different time intervals change with the exposure conditions. Unlike effects are observed on the time evolution of these two parameters with different pozolanic additions. Considerations are also made about the usefulness of these parameters for service life predictions on reinforced concrete structures.


Online publication: 2007
Publication Type: full_text
Public price (Euros): 0.00