TY - JOUR
T1 - A refined, self-consistent Poisson-Nernst-Planck (PNP) model for electrically induced transport of multiple ionic species through concrete
AU - Yang, Pu
AU - Sant, Gaurav
AU - Neithalath, Narayanan
N1 - Funding Information:
The authors gratefully acknowledge the National Science Foundation for the financial support for this research (CMMI: 1068985). The materials were provided by U.S. Concrete, OMYA A.G, Headwaters Resources, and Burgess Pigments and are acknowledged. This research was conducted in the Laboratory for the Science of Sustainable Infrastructural Materials at Arizona State University and the support that has made this laboratory possible is acknowledged. The contents of this paper reflect the views of the authors who are responsible for the facts and accuracy of the data presented herein, and do not necessarily reflect the views and policies of the funding agency, nor do the contents constitute a standard, specification, or a regulation.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017/9
Y1 - 2017/9
N2 - A fundamental re-look of the use of Poisson-Nernst-Planck (PNP) model for predicting electrically accelerated ionic transport through concrete is carried out. The PNP model is augmented with concentration-based diffusion coefficients and explicit considerations of transport path in the formulations since the electric field is distributed only along the connected pore path. The geometric tortuosity obtained from electrical property measurements is modified with a multiplicative correction factor that is a function of the ratio of dominant pore sizes in the specimen. Idealized models of the pore structure are used to arrive at this correction factor, which ranges between 1.5-to-3.0 for typically used concretes. Time-dependent changes in boundary conditions induced by the electrode reactions are also accounted for. The effect of chloride binding as a time-dependent process during the test, is also ascertained. The model is verified on a series of concretes of different water-to-cement ratios and containing different cement replacement materials (fillers and/or reactive materials) subjected to the non-steady state migration test.
AB - A fundamental re-look of the use of Poisson-Nernst-Planck (PNP) model for predicting electrically accelerated ionic transport through concrete is carried out. The PNP model is augmented with concentration-based diffusion coefficients and explicit considerations of transport path in the formulations since the electric field is distributed only along the connected pore path. The geometric tortuosity obtained from electrical property measurements is modified with a multiplicative correction factor that is a function of the ratio of dominant pore sizes in the specimen. Idealized models of the pore structure are used to arrive at this correction factor, which ranges between 1.5-to-3.0 for typically used concretes. Time-dependent changes in boundary conditions induced by the electrode reactions are also accounted for. The effect of chloride binding as a time-dependent process during the test, is also ascertained. The model is verified on a series of concretes of different water-to-cement ratios and containing different cement replacement materials (fillers and/or reactive materials) subjected to the non-steady state migration test.
KW - Electrical properties
KW - Finite element analysis
KW - Poisson-Nernst-Planck (PNP) model
KW - Transport properties
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U2 - 10.1016/j.cemconcomp.2017.05.015
DO - 10.1016/j.cemconcomp.2017.05.015
M3 - Article
AN - SCOPUS:85020037691
VL - 82
SP - 80
EP - 94
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
SN - 0958-9465
ER -