Estimating the electrical conductivity of cement paste pore solutions from OH-, K+ and Na+ concentrations

K. A. Snyder, X. Feng, B. D. Keen, Thomas O Mason

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

A proposed method for estimating the electrical conductivity of cement paste pore solution at 25 °C is based on the concentrations of OH-, K+ and Na+. The approach uses an equation that is a function of the solution ionic strength, and requires a single coefficient for each ionic species. To test the method, the conductivity of solutions containing mixtures of potassium hydroxide and sodium hydroxide with molar ratios of 4:1, 2:1 and 1:1, and having ionic strengths varying from 0.15 to 2.00 mol/l were measured in the laboratory and compared to predicted values. The proposed equation predicts the conductivity of the solutions to within 8% over the concentration range investigated. By comparison, the dilute electrolyte assumption that conductivity is linearly proportional to concentration is in error by 36% at 1 mol/l and in error by 55% at 2 mol/l. The significance and utility of the proposed equation is discussed in the context of predicting ionic transport in cement-based systems. Published by Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)793-798
Number of pages6
JournalCement and Concrete Research
Volume33
Issue number6
DOIs
Publication statusPublished - Jun 2003

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Keywords

  • Alkalis
  • Electrical properties
  • Modeling
  • Pore solution
  • Transport properties

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Ceramics and Composites

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