<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Hydrated Portland cement paste exposed to a NaCl solution was acidified by adding HCl in small steps, gradually lowering the pH. The chloride binding of the cement paste changed as a function of the pH. For the range of pH from 13.2 to 12.2, decreasing pH resulted in a considerable increase in the chloride binding. At a pH of 11, the cement paste showed almost no chloride binding. In order to explain the changes in chloride binding upon lowering the pH, the phase assemblage was investigated with SEM-EDS, TGA and XRD and compared to a thermodynamic modelling.</p></abstract>

Hydrated Portland cement paste exposed to a NaCl solution was acidified by adding HCl in small steps, gradually lowering the pH. The chloride binding of the cement paste changed as a function of the pH. For the range of pH from 13.2 to 12.2, decreasing pH resulted in a considerable increase in the chloride binding. At a pH of 11, the cement paste showed almost no chloride binding. In order to explain the changes in chloride binding upon lowering the pH, the phase assemblage was investigated with SEM-EDS, TGA and XRD and compared to a thermodynamic modelling.

Towards the Understanding of the pH Dependency of the Chloride Binding of Portland Cement Pastes

Department of Materials Science and Engineering

Nordic Concrete Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Hydrated Portland cement paste exposed to a NaCl solution was acidified by adding HCl in small steps, gradually lowering the pH. The chloride binding of the...

Towards the Understanding of the pH Dependency of the Chloride Binding of Portland Cement Pastes

Publié en ligne: 01 déc. 2018

Pages: 143 - 162

Reçu: 15 mars 2018

Accepté: 29 mai 2018

DOI: https://doi.org/10.2478/ncr-2018-0009

Mots clés
chloride binding, pH, C-S-H, thermodynamic modelling, leaching

© 2018 Alisa Machner et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Towards the Understanding of the pH Dependency of the Chloride Binding of Portland Cement Pastes

Publié en ligne: 01 déc. 2018

Pages: 143 - 162

Reçu: 15 mars 2018

Accepté: 29 mai 2018

DOI: https://doi.org/10.2478/ncr-2018-0009

Mots cléschloride binding, pH, C-S-H, thermodynamic modelling, leaching

© 2018 Alisa Machner et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
chloride binding, pH, C-S-H, thermodynamic modelling, leaching