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NUMERICAL SIMULATION OF CHLORIDE MIGRATION IN CONCRETE STRUCTURES UNDER HARSH ENVIRONMENTAL CONDITIONS



Author(s): Tetsuya Ishida, Yuya Takahashi and Rungrawee Wattanapornprom
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 5
Total Pages: 1
Language: English


Abstract: This study presents a comprehensive framework of numerical simulation, modelling environmental actions and mass and ionic transport in cementitious materials. In order to obtain reliable and valid prediction of chloride migration in concrete structures, accurate input data on environmental conditions is necessary. Thus, in this study, the generation and transportation processes of airborne chloride are computed with a numerical model, using meteorological and oceanographic data. Through systematic numerical verification, it is shown that the model estimation reasonably agrees with on-site measurement data for airborne chloride. The computed airborne chloride flux is given as a boundary condition to a finite element analytical system, in which multi-chemo-physics modelling of chemical reactions and mass/ion transport are mutually interlinked. In this system, modelling of chloride equilibrium and transport is solved by being coupled with a cement hydration model, a micro-pore structure development model, a moisture equilibrium and transport model, and in this way the chloride migration process can be traced under arbitrary conditions in a unified way. The proposed framework is verified with both laboratory scale experiments and exposure tests in real environments.


Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00