### Abstract

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.

Language | English (US) |
---|---|

Pages | 80-94 |

Number of pages | 15 |

Journal | Cement and Concrete Composites |

Volume | 82 |

DOIs | |

State | Published - Sep 1 2017 |

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### Keywords

- Electrical properties
- Finite element analysis
- Poisson-Nernst-Planck (PNP) model
- Transport properties

### ASJC Scopus subject areas

- Building and Construction
- Materials Science(all)

### Cite this

**A refined, self-consistent Poisson-Nernst-Planck (PNP) model for electrically induced transport of multiple ionic species through concrete.** / Yang, Pu; Sant, Gaurav; Neithalath, Narayanan.

Research output: Contribution to journal › Article

}

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

PY - 2017/9/1

Y1 - 2017/9/1

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

UR - http://www.scopus.com/inward/record.url?scp=85020037691&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020037691&partnerID=8YFLogxK

U2 - 10.1016/j.cemconcomp.2017.05.015

DO - 10.1016/j.cemconcomp.2017.05.015

M3 - Article

VL - 82

SP - 80

EP - 94

JO - Cement and Concrete Composites

T2 - Cement and Concrete Composites

JF - Cement and Concrete Composites

SN - 0958-9465

ER -