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dc.contributor.authorCuesta-Garcia, Ana Maria
dc.contributor.authorGomez-de-la-Torre, Maria de los Angeles 
dc.contributor.authorSantacruz-Cruz, Maria Isabel
dc.contributor.authorDiaz, Ana
dc.contributor.authorTrtik, Pavel
dc.contributor.authorHoller, Mirko
dc.contributor.authorLothenbach, Barbara
dc.contributor.authorGarcía-Aranda, Miguel Ángel 
dc.date.accessioned2019-05-03T09:28:10Z
dc.date.available2019-05-03T09:28:10Z
dc.date.issued2019
dc.identifier.citationIUCrJ (2019). 6, 473–491en_US
dc.identifier.urihttps://hdl.handle.net/10630/17614
dc.description.abstractMortars and concretes are ubiquitous materials with very complex hierarchical microstructures. To fully understand their main properties and to decrease their CO2 footprint, a sound description of their spatially resolved mineralogy is necessary. Developing this knowledge is very challenging as about half of the volume of hydrated cement is a nanocrystalline component, calcium silicate hydrate (C-S-H) gel. Furthermore, other poorly crystalline phases (e.g. iron siliceous hydrogarnet or silica oxide) may coexist, which are even more difficult to characterize. Traditional spatially resolved techniques such as electron microscopy involve complex sample preparation steps that often lead to artefacts (e.g. dehydration and microstructural changes). Here, synchrotron ptychographic tomography has been used to obtain spatially resolved information on three unaltered representative samples: neat Portland paste, Portland–calcite and Portland–fly-ash blend pastes with a spatial resolution below 100 nm in samples with a volume of up to 5 x 104 mm3. For the neat Portland paste, the ptychotomographic study gave densities of 2.11 and 2.52 g cm -3 and a content of 41.1 and 6.4 vol% for nanocrystalline C-S-H gel and poorly crystalline iron siliceous hydrogarnet, respectively. Furthermore, the spatially resolved volumetric mass-density information has allowed characterization of inner-product and outer-product C-S-H gels. The average density of the inner-product C-S-H is smaller than that of the outer product and its variability is larger. Full characterization of the pastes, including segmentation of the different components, is reported and the contents are compared with the results obtained by thermodynamic modelling.en_US
dc.description.sponsorshipThis work has been supported by MINECO through BIA2014-57658 and BIA2017-82391-R research grants, which are cofunded by FEDER. 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.en_US
dc.language.isoengen_US
dc.publisherIUCren_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectCemento Portlanden_US
dc.subjectRayos X, Análisis poren_US
dc.subjectMicroestructuraen_US
dc.subjectDensidad-Mediciónen_US
dc.subjectTomografíaen_US
dc.subjectTermodinámicaen_US
dc.subject.otherPortland cementen_US
dc.subject.otherX-ray imagingen_US
dc.subject.othermicrostructure determinationen_US
dc.subject.otherdensity measurementsen_US
dc.subject.otherC-S-H gelsen_US
dc.subject.otheramorphous hydrogarneten_US
dc.subject.othersynchrotron ptychographic tomographyen_US
dc.subject.othernanocrystalline componentsen_US
dc.subject.otherthermodynamic modellingen_US
dc.titleQuantitative disentanglement of nanocrystalline phases in cement pastes by synchrotron ptychographic X-ray tomographyen_US
dc.typeinfo:eu-repo/semantics/articleen_US
dc.centroFacultad de Cienciasen_US
dc.identifier.doihttps://doi.org/10.1107/S205225251900377
dc.rights.ccAttribution-NonCommercial-NoDerivatives 4.0 Internacional*


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