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Title

In-situ monitoring the realkalisation process by neutron diffraction: Electroosmotic flux and portlandite formation

AuthorsCastellote, Marta; Llorente, Irene CSIC ORCID ; Andrade Perdrix, Carmen ; Turrillas, Xabier M. CSIC ORCID ; Alonso, M. Cruz ; Campo, Javier CSIC ORCID
KeywordsRealkalisation
Neutron diffraction
Portlandite formation
Electroosmotic flux
Issue DateMay-2006
PublisherElsevier
CitationCement and Concrete Research 36(5): 791-800 (2006)
AbstractEven 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% CO2, 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.
Description10 pages, 12 figures, 3 tables.
Publisher version (URL)http://dx.doi.org/10.1016/j.cemconres.2005.11.014
URIhttp://hdl.handle.net/10261/19719
DOI10.1016/j.cemconres.2005.11.014
ISSN0008-8846
Appears in Collections:(IETCC) Artículos
(ICMA) Artículos

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