Journal article
Ionic transport in cementitious materials under an externally applied electric field: Finite element modeling
Construction & building materials, Vol.27(1), pp.450-460
2012
Handle:
https://hdl.handle.net/2376/120983
Abstract
► We experimentally measure chloride diffusivity in mortar and in concrete. ► The results are inversely parameterized to extract chloride diffusion coefficients. ► We numerically model the transport of ionic species in concrete during ECE. ► We examine the effect of current density, treatment time, and initial chloride content. ► We examine the effect of rebar position, coarse aggregates, and cracks in concrete.
Rebar corrosion is a major deterioration mechanism for reinforced concrete and other cementitious materials, which is often resulted from the ingress of chloride ions from deicer applications or marine environments. Electrochemical chloride extraction (ECE) is an effective corrosion mitigation technique that is gaining world-wide application. In this work, accelerated migration tests with the aid of an externally-applied electric field were utilized to investigate chloride transport in cementitious materials, the results of which were inversely parameterized to extract chloride diffusion coefficients. Computational studies on transport of ionic species during ECE in cementitious paste, mortar, and concrete materials were then explored. The nonlinear partial differential equations to characterize spatial and temporal evolution of various species were formulated with the finite element method (FEM), and important factors for heterogeneous materials, such as ionic interactions between various species, chloride binding, role of aggregates and cracks, were discussed.
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Details
- Title
- Ionic transport in cementitious materials under an externally applied electric field: Finite element modeling
- Creators
- Yajun Liu - Corrosion & Sustainable Infrastructure Laboratory, Western Transportation Institute, Montana State University, P.O. Box 174250, Bozeman, MT 59717-4250, USAXianming Shi - Corrosion & Sustainable Infrastructure Laboratory, Western Transportation Institute, Montana State University, P.O. Box 174250, Bozeman, MT 59717-4250, USA
- Publication Details
- Construction & building materials, Vol.27(1), pp.450-460
- Academic Unit
- Civil and Environmental Engineering, Department of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900612702901842
- Language
- English
- Resource Type
- Journal article