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dc.contributor.authorCuesta, Ana
dc.contributor.authorZea-Garcia, Jesus D.
dc.contributor.authorLondono-Zuluaga, Diana
dc.contributor.authorDe la Torre, Angeles G.
dc.contributor.authorSantacruz, Isabel
dc.contributor.authorVallcorba, Oriol
dc.contributor.authorAranda, Miguel A.G.
dc.date.accessioned2017-10-25T09:34:25Z
dc.date.available2017-10-25T09:34:25Z
dc.date.issued2017
dc.identifier.citationCrystals 2017, 7, 317; doi:10.3390/cryst7100317es_ES
dc.identifier.issn2073-4352
dc.identifier.urihttp://hdl.handle.net/10630/14699
dc.description.abstractThe analysis of atomic ordering in a nanocrystalline phase with small particle sizes, below 5 nm, is intrinsically complicated because of the lack of long-range order. Furthermore, the presence of additional crystalline phase(s) may exacerbate the problem, as is the case in cement pastes. Here, we use the synchrotron pair distribution function (PDF) chiefly to characterize the local atomic order of the nanocrystalline phases, gels, in cement pastes. We have used a multi r-range analysis approach, where the ~4–7 nm r-range allows determining the crystalline phase contents; the ~1–2.5 nm r-range is used to characterize the atomic ordering in the nanocrystalline component; and the ~0.2–1.0 nm r-range gives insights about additional amorphous components. Specifically, we have prepared four alite pastes with variable water contents, and the analyses showed that a defective tobermorite, Ca11Si9O28(OH)2 8.5H2O, gave the best fit. Furthermore, the PDF analyses suggest that the calcium silicate hydrate gel is composed of this tobermorite and amorphous calcium hydroxide. Finally, this approach has been used to study alternative cements. The hydration of monocalcium aluminate and ye’elimite pastes yield aluminum hydroxide gels. PDF analyses show that these gels are constituted of nanocrystalline gibbsite, and the particle size can be as small as 2.5 nmes_ES
dc.description.sponsorshipThis work has been supported by Spanish MINECO through BIA2014-57658-C2-2-R, which is co-funded by FEDER, BIA2014-57658-C2-1-R and I3 (IEDI-2016-0079) grants. We also thank CELLS-ALBA (Barcelona, Spain) for providing synchrotron beam time at BL04-MSPD beamline. Finally, we thank Prof. Simon Billinge, Long Yang and Monica Dapiaggi for their help with the PDF script and simulations for Ca(OH)2 scattering dataes_ES
dc.language.isoenges_ES
dc.publisherMDPIes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectCemento Portlandes_ES
dc.subject.otherPortland cementes_ES
dc.subject.otherC-S-H geles_ES
dc.subject.otherCementitious materialses_ES
dc.subject.otherAmorphous phaseses_ES
dc.subject.otherTotal scatteringes_ES
dc.titleSynchrotron Radiation Pair Distribution Function Analysis of Gels in Cementses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.centroFacultad de Cienciases_ES
dc.cclicenseby-nc-ndes_ES


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