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dc.contributor.authorBordallo, H.N.
dc.contributor.authorAldridge, L.P.
dc.contributor.authorFouquet, P.
dc.contributor.authorPardo Soto, Luis Carlos
dc.contributor.authorUnruh, T.
dc.contributor.authorWuttke, J.
dc.contributor.authorYokaichiya, F.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.date.accessioned2010-10-15T09:00:14Z
dc.date.available2010-10-15T09:00:14Z
dc.date.created2009-09-25
dc.date.issued2009-09-25
dc.identifier.citationBordallo, H. [et al.]. Hindered water motions in hardened cement pastes investigated over broad time and length scales. "ACS applied materials and interfaces", 25 Setembre 2009, vol. 1, núm. 10, p. 2154-2162.
dc.identifier.issn1944-8244
dc.identifier.urihttp://hdl.handle.net/2117/9711
dc.description.abstractWe investigated the dynamics of confined water in different hydrated cement pastes with minimized contributions of capillary water. It was found that the water motions are extremely reduced compared to those of bulk water. The onset of water mobility, which was modified by the local environment, was investigated with elastic temperature scans using the high-resolution neutron backscattering instrument SPHERES. Using a Cauchy-Lorenz distribution, the quasi-elastic signal observed in the spectra obtained by the backscattering spectrometer was analyzed, leading to the identification of rotational motions with relaxation times of 0.3 ns. Additionally, neutron spin echo (NSE) spectroscopy was used to measure the water diffusion over the local network of pores. The motions observed in the NSE time scale were characterized by diffusion constants ranging from 0.6 to 1.1 × 10-9 m2 s-1 most likely related to water molecules removed from the interface. In summary, our results indicate that the local diffusion observed in the gel pores of hardened cement pastes is on the order of that found in deeply supercooled water. Finally, the importance of the magnetic properties of cement pastes were discussed in relation to the observation of a quasi-elastic signal on the dried sample spectra measured using the time-of-flight spectrometer.
dc.format.extent9 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials
dc.subjectÀrees temàtiques de la UPC::Física::Electromagnetisme::Magnetisme
dc.subject.lcshCement--Testing
dc.subject.lcshMagnetic
dc.titleHindered water motions in hardened cement pastes investigated over broad time and length scales
dc.typeArticle
dc.subject.lemacCiment -- Assaigs
dc.subject.lemacMagnetisme
dc.contributor.groupUniversitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
dc.identifier.doi10.1021/am900332n
dc.relation.publisherversionhttp://pubs.acs.org/doi/pdfplus/10.1021/am900332n
dc.rights.accessRestricted access - publisher's policy
local.identifier.drac3270776
dc.description.versionPostprint (published version)
local.citation.authorBordallo, H.; Aldridge, L.; Fouquet, P.; Pardo, L.; Unruh, T.; Wuttke, J.; Yokaichiya, F.
local.citation.publicationNameACS applied materials and interfaces
local.citation.volume1
local.citation.number10
local.citation.startingPage2154
local.citation.endingPage2162


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