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dc.contributor.authorCuesta, Ana
dc.contributor.authorDe la Torre, Angeles G.
dc.contributor.authorSantacruz, Isabel
dc.contributor.authorTrtik, Pavel
dc.contributor.authorDa Silva, Julio C.
dc.contributor.authorDíaz, Ana
dc.contributor.authorHoller, Mirko
dc.contributor.authorAranda, Miguel A.G.
dc.date.accessioned2017-05-12T06:42:18Z
dc.date.issued2017
dc.identifier.citationJ. Phys. Chem. C 2017, 121, 3044−3054es_ES
dc.identifier.isbn1932-7455
dc.identifier.urihttp://hdl.handle.net/10630/13629
dc.description.abstractEco-cements are a desirable alternative to ordinary Portland cements because of their lower CO2 footprints. Some ye’elimite-based ecocements are attracting a lot of interest. Understanding the reasons for the mechanical performances requires the characterization of features such as mass density of the hydrated component phases, including the amorphous gel, on the submicrometer scale, which is challenging. Here we use ptychographic Xray computed tomography to provide 3D mass density and attenuation coefficient distributions of eco-cement pastes with an isotropic resolution close to 100 nm allowing to distinguish between component phases with very similar contrast. In combination with laboratory techniques such as the Rietveld method, 27Al MAS NMR, and electron microscopies, we report compositions and densities of key components. The ettringite and gel volume distributions have been mapped out in the segmented tomograms. Moreover, we discriminate between an aluminum hydroxide gel and calcium aluminum monosulfate, which have close electron density values. Specifically, the composition and mass density of two aluminum hydroxide gel agglomerates have been determined: (CaO)0.04Al(OH)3·2.3H2O with 1.48(3) g·cm−3 and (CaO)0.12Al(OH)3 with 2.05(3) g·cm−3, which was a long-standing challenge.es_ES
dc.description.sponsorshipThis work has been supported by MINECO through BIA2014−57658-C2-1-R and BIA2014-57658-C2-2-R, which is cofunded by FEDER, research grants. We thank SLS for providing beamtime at the cSAXS beamline. We also thank the Swiss National Science Foundation SNF for the support to the work of J.C.d.S. (Grant 137772). Instrumentation development was supported by SNF (R’EQUIP, No. 145056,“OMNY”) and the Competence Centre for Materials Science and Technology (CCMX) of the ETH-Board, Switzerland. In addition, the authors would like to thank Dr. Manuel Guizar-Sicairos for his valuable assistance with the ptychography and PXCT data analysis.es_ES
dc.language.isoenges_ES
dc.publisherACSes_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectCementoes_ES
dc.titleChemistry and Mass Density of Aluminum Hydroxide Gel in Eco-Cements by Ptychographic X-ray Computed Tomographyes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.centroFacultad de Cienciases_ES
dc.description.embargo2018-01-17
dc.cclicenseby-nc-ndes_ES


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