2024-03-28T12:00:36Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/197192021-07-22T10:02:22Zcom_10261_23com_10261_3com_10261_31col_10261_276col_10261_284
In-situ monitoring the realkalisation process by neutron diffraction: Electroosmotic flux and portlandite formation
Castellote, Marta
Llorente, Irene
Andrade Perdrix, Carmen
Turrillas, Xabier M.
Alonso, M. Cruz
Campo, Javier
Realkalisation
Neutron diffraction
Portlandite formation
Electroosmotic flux
10 pages, 12 figures, 3 tables.
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% 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.
The authors also acknowledge
the funding provided by the Spanish MMA through the
project n- 055/2004/3.
Peer reviewed
2009-12-21T09:25:09Z
2009-12-21T09:25:09Z
2006-05
artÃculo
http://purl.org/coar/resource_type/c_6501
Cement and Concrete Research 36(5): 791-800 (2006)
0008-8846
http://hdl.handle.net/10261/19719
10.1016/j.cemconres.2005.11.014
en
http://dx.doi.org/10.1016/j.cemconres.2005.11.014
none
259768 bytes
application/pdf
Elsevier