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Estimation of Pore Solution Conductivity


(Return to Cement Hydration and Degradation Modeling Software)

The purpose of this form is to provide an estimate of the electrical conductivity (S/m) of the pore solution in a concrete based on the mixture proportions and achieved degree of hydration.

It is assumed that 75% of the sodium and potassium initially present as oxides in the cement-based materials will be released into the pore solution. In the presence of silica fume, more alkalies are absorbed by the products of the pozzolanic reactions and "free" alkali ions are further reduced. This calculation only considers the alkali ions and their accompanying hydroxides and not others such as chlorides, etc.


Type of software: Composition and conductivity of concrete pore solution



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This software was developed at the National Institute of Standards and Technology by employees of the Federal Government in the course of their official duties. Pursuant to title 17 Section 105 of the United States Code this software is not subject to copyright protection and is in the public domain. This software is an experimental system. NIST assumes no responsibility whatsoever for its use by other parties, and makes no guarantees, expressed or implied, about its quality, reliability, or any other characteristic. We would appreciate acknowledgement if the software is used.

This software can be redistributed and/or modified freely provided that any derivative works bear some notice that they are derived from it, and any modified versions bear some notice that they have been modified.


General Information:
Dale P. Bentz, Chemical Engineer, Inorganic Materials Group 301-975-5865 Telephone

100 Bureau Drive, M/S 8615
Gaithersburg, MD 20899-8615