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Modelling of chloride transport coupled with moisture migration in concrete with application to cracked concrete structures



Title: Modelling of chloride transport coupled with moisture migration in concrete with application to cracked concrete structures
Author(s): P. O’Neill Iqbal, T. Ishida
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 455 - 462
Total Pages: 8
Nb references: 9
Language: English


Abstract: Concrete is a wonderful invention of construction industry as a simple manageable composite material, but its perfection of construction is fraught with inhibited disabilities of concrete of multifarious nature and extent, thus the ingress of deleterious materials, like chloride is facilitated to troublesome extent. In this research the chloride penetration in concrete is modeled under marine environment loadings. The strong sorption flux generated as a result of wetting and drying cyclic exposure is modeled by simulating completely saturated environment at the exposed surface. Coupling the moisture conductivity model with chloride transport model then simulates chloride profiles. In reality concrete is never crackfree, therefore chloride transport in cracked concrete is also modeled by introducing large air spaces (void elements) in the cracked zone, by introducing a separate chloride diffusion coefficient for crack. Chloride diffusivity along the crack length is enhanced by considering, constrictivity parameter independent of bound chlorides. Numerical verifications were found in good agreement with past experimental studies.


Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00