In-situ monitoring the realkalisation process by neutron diffraction: Electroosmotic flux and portlandite formation
- Institute of Construction Sciences 'Eduardo Torroja' (IETcc), CSIC, 28033, Madrid (Spain)
- Institute of Science of Materials of Aragon (ICMA), CSIC, 50005, Zaragoza (Spain)
Even though the electroosmotic flux through hardened cementitious materials during laboratory realkalisation trials had been previously noticed, it has never been in-situ monitored, analysing at the same time the establishment of the electroosmotic flux and the microstructure changes in the surroundings of the rebar. In this paper, two series of cement pastes, cast with CEM I and CEM I substituted in a 35% by fly ash, previously carbonated at 100% CO{sub 2}, were submitted to realkalisation treatments followed on line by simultaneous acquisition of neutron diffraction data. As a result, it has been possible to confirm the electroosmosis as the driving force of carbonates towards the rebar and to determine the range of pH in the anolyte in which most of the relevant electroosmotic phenomena takes place. On the other hand, the behaviour of the main crystalline phases involved in the process has been monitored during the treatment, with the precipitation of portlandite as main result.
- OSTI ID:
- 20793286
- Journal Information:
- Cement and Concrete Research, Vol. 36, Issue 5; Other Information: DOI: 10.1016/j.cemconres.2005.11.014; PII: S0008-8846(05)00286-3; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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