Towards the Understanding of the pH Dependency of the Chloride Binding of Portland Cement Pastes
| Author(s): |
Alisa Machner
(Researcher, NTNU , Department of Structural Engineering , Richard Birkelandsvei 1A, 7491 Trondheim)
Petter Hemstad (MSc Student, NTNU , Department of Materials Science and Engineering , Alfred Getz vei 2, 7491 Trondheim) Klaartje De Weerdt (Førsteamanuensis, NTNU , Department of Structural Engineering , Richard Birkelandsvei 1A, 7491 Trondheim) |
|---|---|
| Medium: | journal article |
| Language(s): | English |
| Published in: | Nordic Concrete Research, June 2018, n. 1, v. 58 |
| Page(s): | 143-162 |
| DOI: | 10.2478/ncr-2018-0009 |
| 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. |
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10705874 - Published on:
19/02/2023 - Last updated on:
19/02/2023
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