## 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 language | English |
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Pages (from-to) | 793-798 |

Number of pages | 6 |

Journal | Cement and Concrete Research |

Volume | 33 |

Issue number | 6 |

DOIs | |

Publication status | Published - Jun 1 2003 |

## Keywords

- Alkalis
- Electrical properties
- Modeling
- Pore solution
- Transport properties

## ASJC Scopus subject areas

- Building and Construction
- Materials Science(all)