Electrically induced chloride ion transport in alkali activated slag concretes and the influence of microstructure

Deepak Ravikumar, Narayanan Neithalath

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Chloride ion transport in alkali silicate powder and liquid activated slag concretes, and the influence of the material microstructure are discussed. Increasing the Na2O-to-slag ratio (n) results in a reduction in the rapid chloride permeability (RCP) and non-steady state migration (NSSM) coefficients (Dnssm) of solid sodium silicate activated slag concretes. Increasing the SiO2-to-Na2O ratio (M s) of the activator beneficially influences the transport parameters of liquid sodium silicate activated concretes. The chloride transport parameters are related to the reaction product microstructure and composition evaluated using mercury intrusion porosimetry (MIP) and Fourier Transform Infrared (FTIR) spectroscopy respectively. A reduction in the critical pore sizes reduces the transport coefficients to a larger extent than porosity reduction, which is responsible for the better performance of solid sodium silicate activated concretes. The total chloride concentration determined from the charge passed and the ionic transference numbers is used to predict an apparent non-steady state transport coefficient.

Original languageEnglish (US)
Pages (from-to)31-42
Number of pages12
JournalCement and Concrete Research
Volume47
DOIs
StatePublished - Mar 15 2013

Keywords

  • Alkali activated slag (D)
  • Electrical properties (C)
  • Mercury porosimetry (B)
  • Microstructure (B)
  • Transport properties (C)

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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