Electrically driven chloride ion transport in blended binder concretes: Insights from experiments and numerical simulations

Matthew Aguayo, Pu Yang, Kirk Vance, Gaurav Sant, Narayanan Neithalath

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Chloride ion transport driven by electrical potential gradients is discussed in concretes wherein OPC is partially replaced by limestone or a combination of limestone and fly ash/metakaolin at replacement levels of 20% or 35% (volume-basis). The ternary formulations demonstrate non-steady state Cl- migration (NSSM) coefficients that are comparable to or lower than those of the control OPC concretes, with metakaolin blends showing markedly better performance. A pore structure factor extracted through electrical conductivity measurements before the NSSM test is correlated with Cl- penetration depths after the migration test. The transport of all ionic species (Cl-, OH-, Na+, K+) is modeled using an explicit finite element framework via the coupled Poisson-Nernst-Planck (PNP) equation with suitable consideration of: (a) concentration (depth)-dependent diffusion coefficients, (b) pore-structure factor, and (c) Cl- binding. With informed inputs of material properties, the simulations are able to reliably capture Cl- penetration behaviors in plain and blended binder formulations.

Original languageEnglish (US)
Pages (from-to)1-10
Number of pages10
JournalCement and Concrete Research
Volume66
DOIs
StatePublished - Aug 19 2014

Keywords

  • Blended cements (D)
  • CaCO3 (D)
  • Diffusion (C)
  • Microstructure (B)
  • Transport properties (C)

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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